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CA08104001E For more information, visit: www.eaton.com/consultants
September 2011
Contents
Power Circuit Breakers & Insulated-Case Circuit Breakers26
Sheet 26001
PowerC
ircuitB
reakers
&
Insulated-CaseCircuitBreakers
Power Circuit Breakers & Insulated-Case Circuit Breakers
Breaker Type Comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26.0-2
Magnum Product Family
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26.1-1
Magnum DS Low Voltage Power Circuit Breakers . . . . . . . . . . . . . . . . . .
26.1-5
Magnum SB Insulated-Case Circuit Breakers . . . . . . . . . . . . . . . . . . . . . .
26.1-12
Breaker-Mounted Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26.1-14
Trip Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26.1-15
Technical and Application Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26.1-21
Accessories and Peripheral Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26.1-27
Series NRX Product Family
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26.2-1
Technical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26.2-1
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26.2-2
Trip Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26.2-4
Communications Adapter Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26.2-5
Specifications
See Eatons Product Specification Guide
, available on CD or on the Web.CSI Format: . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1995 2010
Power Circuit BreakersMagnum DS and Series NRXPower Circuit Breakers . . . . . . . . . . . . . . . Section 16475 Section 26 28 11
Insulated Case Circuit BreakersMagnum SB and Series NRXInsulated-Case Circuit Breakers . . . . . . . . Section 16475 Section 26 28 11
Electronic Trip Units
. . . . . . . . . . . . . . . . . . . Section 16904 Section 26 28 50
Low Voltage Circuit Breakers
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CA08104001E
September 2011
Power Circuit Breakers & Insulated-Case Circuit Breakers
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Breaker Type Comparison
002
Summary of Differences Between Low Voltage Power Circuit Breakers,Insulated-Case Circuit Breakers and Molded-Case Circuit Breakers
There are two main classificationsof low voltage circuit breakersmolded-case circuit breakers and low
voltage power circuit breakers. AllUL
, NEMA
and ANSI standards arefor molded-case circuit breakers andlow voltage power circuit breakers.
The industry recognizes three types ofcircuit breakersmolded-case circuitbreakers (MCCB), insulated-case circuitbreakers (ICCB) and low voltage powercircuit breakers LVPCB). Insulated-casecircuit breakers are designed to meetthe standards for molded-case circuitbreakers.
Low voltage power circuit breakerscomply with the following standards:
ANSI Std. C37.16Preferred Ratings
ANSI Std. C37.17Trip Devices forLVPCB
ANSI Std. C37.50Test Procedures
IEEE
Std. C37.13LVPCB Used inEnclosures
UL 1066LVPCB
Molded-case circuit breakers andinsulated-case circuit breakers typicallycomply with the following standards:
UL 489MCCB
UL 489Molded-Case Switches(MCS)
NEMA AB1MCCB and MCS
NEMA AB3MCCB Application
Table 26.0-1. Breaker Type Comparison Chart
Description LVPCB
(Type Magnum DS and Series NRX)
ICCB
(Type Magnum SB and Series NRX)
MCCB
(QUICKLAG
/Series C
/Series G
)
Select tripshort-time rating
Selective trip over full range of faultcurrents up to interrupting rating(high short-time ratings)
Selective trip over partial range of faultcurrents within the interrupting rating(medium short-time ratings). Typicallyup to 35 kA
Selective trip over a smaller range of faultcurrents within the interrupting rating (lowshort-time ratings). Typically 1013 timesthe frame size
Operator type Types of operators: mechanicallyoperated and electrically operatedtwo-step stored energy
Types of operators: mechanicallyoperated and electrically operatedtwo-step stored energy
Types of operators: mechanically operatedover-center toggle or motor operator
Closing speed 5-cycle closing for electricallyoperated devices
5-cycle closing for electricallyoperated devices
Greater than 5-cycle closing for electricallyoperated devices
Mounting Available in drawout constructionpermitting racking to a distinct testposition and removal for maintenance
Available in drawout constructionpermitting racking to a distinct testposition and removal for maintenance
Typically fixed-mounted but largeframe sizes may be available in drawoutconstruction
Interrupting rating Interrupting duty at 635 Vac:42100 kA and current limitingwith or without fuses up to 200 kA
Interrupting duty at 508 Vac:35 150 kA
Interrupting duty at 480 Vac:22100 kA without fuses and up to200 kA with integral fuses or for current-limiting type
Current limiting Special current limiting types availablewith or without fuses up to 200 kA
Special current limiting types availablewithout fuses up to 150 kA
Current limiting available with and withoutfuses up to 200 kA
Relative cost Higher Medium Low
Availableframe sizes
Small number of frame sizes available.Typical 8006000A
Small number of frame sizes available.Typical 8006000A
Large number of frame sizes available.Typical 1002500A
Maintenance Extensive maintenance possible on allframe sizes
Limited maintenance possible on largerframe sizes
Very limited maintenance possible on largerframe sizes
Enclosure types Used in enclosures, MCCs,switchboards and switchgear
Used in enclosures, MCCsand switchboards
Used in enclosures, panelboards,switchboards, MCCs and control panels
Series ratings Not available in series ratings Not available in series ratings Available in series ratings
Enclosed rating 100% continuous current rated inits enclosure
80% continuous-current rated, unlessspecifically stated to be rated 100% inan enclosure
80% continuous-current rated, unlessspecifically stated to be rated 100% inan enclosure
Standards ANSI/IEEE C37UL 1066
NEMA AB1/AB3UL 489 or UL 1066
NEMA AB1/AB3UL 489
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CA08104001E For more information, visit: www.eaton.com/consultants
26
September 2011
Power Circuit Breakers & Insulated-Case Circuit Breakers
Sheet 26
Low Voltage Power/Insulated-Case Circuit BreakersMagnum DS and SB
003
Magnum Low VoltagePower Circuit Breakersfor Global Application
Magnum low voltage power circuit
breakers enable comprehensivesolutions to meet and exceed theunique and wide-ranging require-ments of todays global powerdistribution systems. This powerfulcircuit breaker offering is designedfor ultimate custom configuration andapplication flexibility, with the needsof the power distribution equipmentuser and the electrical equipmentmanufacturer in mind.
Standards
Magnum DS circuit breakers meetor exceed all applicable requirementsof ANSI Standards C37.13, C37.17,
C37.50 and CSA.
See Tab 20
for ANSI/UL 1558low voltage drawout switchgearapplication considerations, includingsystem voltage and frequency,continuous current ratings, ambienttemperature, altitude, and otherunusual environmental andoperating conditions.
See Tab 21
for UL 891 switchboardapplication considerations,ratings and layouts.
Three Product Families
Magnum consists of three product families; each provides specific ratingfeatures and approvals to optimize performance when applied in powerdistribution equipment and custom enclosures:
Magnum DS Low Voltage Power Circuit Breakers
for ANSI/UL 1558 Rated Switchgear Applications
Up to 635 Vac
2006000A continuous
42200 kA interrupting
Magnum DS Low Voltage Power Circuit Breaker FamilyANSI Rated for Switchgear Applications
Magnum SB Low Voltage Insulated-Case Circuit Breakersfor UL 891 Switchboard Applications
Up to 635 Vac
2006000A continuous
50150 kA interrupting
Magnum SB Low Voltage Insulated-Case Circuit Breaker FamilyUL Rated for Switchboard Applications
Magnum IEC Rated Air Circuit Breakersfor IEC Rated Switchboard Applications
Up to 690 Vac
2006300A continuous
40105 kA I
cu
/I
cs
Magnum IEC Rated Low Voltage Air Circuit BreakerFamily for IEC Switchboard Applications
For more information on Magnum IECair circuit breakers, please visitwww.eaton.com/electrical
.
http://www.eaton.com/electricalhttp://www.eaton.com/electricalhttp://www.eaton.com/electricalhttp://www.eaton.com/electrical -
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CA08104001E
September 2011
Power Circuit Breakers & Insulated-Case Circuit Breakers
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Low Voltage Power/Insulated-Case Circuit BreakersMagnum DS and SB
004
All Magnum Breaker TypesFeatures, Benefitsand Functions
Interruption ratings up to 200 kA
with current limiting performanceand low current let-through toreduce damaging energy to down-stream equipment at high faultlevels or with high short-timeratings for increased selectivity
Short-time ratings up to 100 kA
to maximize system coordinationand selectivity
Four physical frame sizes
(narrow, standard, doublenarrow and double) to promotebreaker application in compactmodular enclosures
Continuous current ratings from8006000A
with 100% rating at 40C
and no derating on most ratingsup to 50C in a properly sized andventilated enclosure
Fixed breaker mountingconfigurations
with horizontaland optional vertical and frontconnected terminal connections
Drawout breaker mountingconfigurations
with cassetteand optional safety shutters
Three- and four-pole breakerconfigurations
Through-the-door design
forhuman interface with the breakercompartment door closed
Two-step stored energy mechanism
for manually and electricallyoperated breakers
Digitrip RMS Trip Unit familyprotection
with four models eachproviding increasing levels ofprotection and feature optionsfor coordination, informationand diagnostics:
Microprocessor-based rms sensing
Basic to programmable over-current protection and alarms
Local display for information,status and diagnostics
Ampere, voltage andpower metering
Power quality, harmonicsand waveform capture
Communications with translatorsto common protocols
Zone selective interlocking forimproved coordination
Integral Arcflash ReductionMaintenance System
Breaker health monitoring
Field-installable accessories
(UL listed) common across thebreaker frames and designed tobe easily installed in the field toservice or modify the breaker atthe point of use
Secondary terminal contacts
mounted at the top front of thebreaker and away from the primaryvoltage areas for improved safetyand access. Finger-safe terminalblocks accommodate ring-tongue or
spade type terminals as standard
Through-the-Door Design for Human Interfacewith the Breaker Compartment Door Closed
High Technology Microprocessor-Based Digitrip RMS 1150+ Trip Unitsare Available with Advanced Features Like Programmable OvercurrentSettings, Power Metering, Power Quality and Communications
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September 2011
Power Circuit Breakers & Insulated-Case Circuit Breakers
Sheet 26
Low Voltage Power/Insulated-Case Circuit BreakersMagnum DS and SB
005
Breaker Features onFront Cover
The controls and indicators arefunctionally grouped on the breakerfaceplate to optimize the human
interface, visibility and ease of use.For maximum safety, a modern,through-the-door design permitsaccess to the breaker levering system,trip unit, controls and indicators withthe door closed.
Mechanical trip flag pop-outindicator (optional)redInterlocked indicator requiringmanual reset is also available
Accessory viewing windows for:
Shunt Trip Attachment (STA)
Spring Release device (SR)
Undervoltage Release (UVR)device or second STA
Digitrip RMS trip unit (Model 520Mshown) protected by clear cover
Contact status indicators:
OPENgreen
CLOSEDred
Spring status indicators:
Chargedyellow
Dischargedwhite
Push OFF (open) pushbuttonred
Push ON (close) pushbuttongreen
Manual spring charging handlefor manually charging the storedenergy springs
Mechanical operationscounter (optional)
Key off lock (optional)
Padlockable levering deviceshutter for drawout breakers
Color-coded position indicatorfor drawout breakers:
CONNECTred
TESTyellow DISCONNECTgreen
Magnum DS Drawout Breaker
Accessory Viewing Windows VisiblyConfirm the Breaker Shunt Trip,Spring Release, UVR Installationand Their Control Voltage Rating
Through-the-Door Design for HumanInterface with the Breaker CompartmentDoor Closed, for Example, ManuallyCharging the Stored Energy Springs
Drawout Breaker Levering Can beAccomplished with the CompartmentDoor Closed without the Need for aSpecial Levering Tool
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Low Voltage Power/Insulated-Case Circuit BreakersMagnum DS and SB006
Breaker Internal Features
Magnum circuit breakers are designedfor ease of access for inspection,modification and maintenance at thepoint of use. The breaker front cover
is easily removed with four captivebolts, revealing the modular internalbreaker features.
Secondary terminal points forinternal standardized breakerwiring connections
Breaker accessory mounting deckwith three positions for mounting:
Shunt Trip Attachment (STA)
Spring Release device (SR)
Undervoltage Release (UVR)device or second STA
Digitrip RMS Trip Unit
(Model 1150+ shown) Spring charging motor (optional)
for electrically charging the storedenergy springs
Manual spring charging handlefor manually charging the storedenergy springs
Padlockable levering deviceshutter for drawout breakers
Color-coded position indicator fordrawout breakers:
CONNECTred
TESTyellow
DISCONNECTgreen
Secondary contact blocks forconnection to external cellcontrol wiring
Removable arc chute covers for easyaccess to breaker main contacts
Primary finger cluster disconnect-ing contacts for drawout breakerare mounted on the breakerelement for ease of access forinspection and maintenance
Note: Some competitors mount the primaryfinger clusters inside the cell, requiring
shutdown of the switchgear for inspectionand maintenance.
Current sensor viewing windowsto view and confirm breakersensor rating
Rigid frame housing (thermosetcomposite resin) providingincreased strength and durability
Magnum Drawout Breaker Front View with Front Cover RemovedShowing Easy Access to the Breaker Internal Devices
Magnum Drawout Breaker Rear View Showing Primary DisconnectingFinger Clusters Mounted on the Breaker for Ease of Inspection
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CA08104001E For more information, visit: www.eaton.com/consultants
26September 2011
Power Circuit Breakers & Insulated-Case Circuit Breakers
Sheet 26
Power Circuit Breakers
Magnum DS Low Voltage Power Circuit Breakers007
Magnum DS Low VoltagePower Circuit BreakersMagnum DS is a true UL 1066 listedlow voltage power circuit breakerfamily, designed for the highest
performance requirements ofswitchgear and specialtyenclosure applications.
Magnum DS low voltage powercircuit breakers have short-timewithstand and interruption ratingsup to 100 kA at 635 Vac withcontinuous current ratings upto 6000A to maximize systemcoordination and selectivity
Magnum MDDX non-currentlimiting PCBs have 200 kAinterrupting ratings and up to100 kA short-time rating at 508 Vacwith continuous current ratings upto 6000A
Magnum MDSX current limitingpower circuit breakers (fuseless)have 200 kA interrupting ratingsand 3050 kA short-time ratingsat 480 Vac with continuous currentratings up to 5000A
Magnum MDSL current limitingpower circuit breakers with integralcurrent limiters (fuses) have 200 kAinterrupting ratings at 600 Vacwith continuous current ratingsup to 2000A
UL and ANSI TestCertificationsMagnum DS meets or exceeds theapplicable ANSI, NEMA, UL and CSAstandards, including:
ANSI C37.13 (low voltage AC powercircuit breakers used in enclosures)
ANSI C37.16 (preferred ratings,related requirements, andapplication recommendations forlow voltage power circuit breakersand AC power circuit breakers)
ANSI C37.17 (trip devices for ACand general purpose DC low voltagepower circuit breakers)
ANSI C37.50 (test proceduresfor low voltage AC power circuitbreakers used in enclosures)
UL 1066 (standard for low voltageAC and DC power circuit breakers
used in enclosures) NEMA SG3 (this standard adopts
ANSI C37.16 in its entirety)
ComprehensiveEnclosure SolutionsMagnum DS has proven performancein Eaton manufactured switchgearand switchboards with the following
test certifications: UL 1558 (Magnum DS low voltage
metal-enclosed switchgear)
UL 891 (Pow-R-LineC lowvoltage switchboards)
UL 1008 standard for transferswitch equipment
UL, CSA 22.2.31 low voltageassemblies
Approvals
UL listed: Magnum DS breakerUL File No. E52096 and cassetteUL File No. E204565
ABS (American Bureau of Shipping)Type Listed Certificate Number04-HS422844A-DUB
Magnum DS, MDSX and MDSL Circuit Breakers
Magnum DS low voltage power circuitbreakers have high withstand ratings
from 42 to 100 kA to provide for maximumsystem coordination and selectivity.
Magnum MDSX current limiting powercircuit breakers have fast opening
contacts to provide interrupting ratingsup to 200 kA at 508 Vac without fuses.
Magnum MDSL current limiting powercircuit breakers have integral current
limiters to provide interrupting ratingsof 200 kA at 600 Vac.
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Power Circuit Breakers
Magnum DS Low Voltage Power Circuit Breakers008
Selecting the Optimal Magnum Solution for System Coordination,Interruption Performance and Arc Flash Reduction
Table 26.1-1. System Application Considerations
Magnum MDS, MDN and MDDXHigh Short-Time Current RatingBreakers for Maximum CoordinationMagnum MDS and MDDX breakers
are designed to hold in and carrytheir rated short-time current up to0.5 seconds, the maximum trip unitshort-time delay setting. Systemcoordination is maximized when theinstantaneous trip unit settings areeither turned off or set high enough tofacilitate coordination with other loadside protective devices in the circuit.
Energy let-through and arc flash energyto the downstream circuit can besignificantly reduced by employinginstantaneous trip unit settings, as wellas ground fault and zone interlocking.However, the desire to reduce arcflash may have to be balanced with the
necessity to maintain system coordina-tion and continuity. This is especiallytrue at the low fault levels characteristicof arcing faults, because the trip unitinstantaneous trip setting may have tobe set as low as the minimum setting,which could cause lack of coordination.
The integral Arcflash ReductionMaintenance System trip unit optioncan be employed to optimize arc flashreduction during system startup andmaintenance operations.
Magnum MDSX FuselessInterruption Up to 200 kA CurrentLimiting PerformanceMagnum MDSX breakers provide new
fuseless technology with interruptionratings up to 200 kA at 508 Vac. Theinterruption performance is currentlimiting when the fault currentsexceeds the short-time current rating.The self-protecting fast-openingreverse-loop contacts quickly open,clearing the fault in approximately1/4 cycle, reducing energy let-throughand arc flash energy.
Below their short-time current rating,MDSX breakers coordinate like standardMDS breakers. Arc flash levels to thedownstream circuit can be reducedbyemploying the trip unit instantaneoussettings as well as ground fault, zone
interlocking and Arcflash ReductionMaintenance System features.
MDSX breakers have the same compactfootprint as standard MDS breakers.
MDSX improves overall operatingsystem continuity, convenience and lifecycle costs by eliminating fuse trucks,blown limiter change outs, replacementlimiter inventories and the higheroperating watts loss associatedwith fuses.
Magnum MDSL Interruption Up to200 kA with Integral Current Limiters
Magnum MDSL breakers with integralcurrent limiters provide interruptionratings up to 200 kA at 600 Vac. MDSLis especially effective in reducingenergy let-through and arc flash at thehighest fault currents and those thatfall within the current limiting rangeof the current limiter. Interruption isclean and efficient with most of the arcdisplay contained within the currentlimiter. A wide array of current limiterratings are available for selection andapplication with the breaker currentsensor ratings and trip unit settingsto provide for system coordination.
When fault currents fall below thecurrent limiting range of the limiter,energy let-through and arc flash
energy will increase. In this range, alower rated current limiter may beapplied, but considerations must begiven to nuisance blowing of thelimiter and system coordination.
MDSL breakers can also employ tripunit instantaneous settings as well asground fault, zone interlocking andArcflash Reduction MaintenanceSystem features to reduce arc flashlevels. Physically, they are 6.00 inches(152.4 mm) deeper than standardconstruction Magnum breakers.
Magnum Breaker Type Short-TimeCurrent (See
Table 26.1-2)
SystemCoordination
Interruption Arc Flash Energy Operating SystemConvenience and
Life Time Cost
MDS and MDDXHigh short-timecurrentLS tripfunctions with trip unitinstantaneous off
Up to 65 kA(narrow frame)Up to 85 kA(standard frame)Up to 100 kA(double narrowand double frame)
Up to 100 kA Up to 100 kAat 635 VacMDS/MDNUp to 200 kAat 508 VacMDDX
Highest energy Inspect, reset andclose after interruption
MDSXCurrent limitingfastopening reverse loopcontacts with trip unitinstantaneous off
30 kA(standard frame)
50 kA(double frame)
Up to the ratedshort-timecurrent
Based on tripunit settings
200 kAat 508 Vac
Lower energy atfault levels in currentlimiting range aboveshort-time current rating
Inspect, reset andclose after interruption
MDSL
Current limiting integral currentlimiters with trip unitinstantaneous off
Based on current
limiter selected
Based on current
limiter selectedand trip unitsettings
Up to 200 kA
at 600 Vac
Lower energy at fault levels
in the current limiting rangeof current limiter
Blown limiters require
replacement and inventoryOperating watts lossis higher than fuse-lessbreakers
All Magnum breakerswith trip unit instantaneous on
Per Magnumbreaker typeapplied
Trip unit instanta-neous settingsaffect systemcoordination andcontinuity
Per Magnumbreaker typeapplied
May be reduced byemploying trip unit:
Ground fault settings,zone selective interlocking,Arcflash ReductionMaintenance System
Per Magnum breakertype applied
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26September 2011
Power Circuit Breakers & Insulated-Case Circuit Breakers
Sheet 26
Power Circuit Breakers
Magnum DS Low Voltage Power Circuit Breakers009
Magnum DS Switchgear Class UL 1066
Magnum DS Low Voltage Power Circuit Breaker Family ANSI Rated for Switchgear Applications
Table 26.1-2. Magnum DS Switchgear Class UL 1066 Low Voltage Power Circuit Breakers
Interrupting ratings shown based on breaker equipped with integral Digitrip RMS trip unit. Interruption ratings for non-automatic breakers are equal to thepublished short-time withstand rating. These interruption ratings are based on the standard duty cycle consisting of an open operation, a 15-second inter-val and a close-open operation, in succession, with delayed tripping in case of short-delay devices. The standard duty cycle for short-time ratings consistsof maintaining the rated current for two periods of 1/2 seconds each, with a 15-second interval of zero current between the two periods.
Magnum MDSL current limiting power circuit breaker with integral current limiters. Current limiter selected determines short-time and fixedinstantaneous trip rating. Maximum voltage rating is 600 Vac.
Magnum MDSX fuseless current limiting power circuit breakers with fast opening contacts. SeeTable 26.1-1on Page 26.1-6for peak let-through chart. Product to be tested. Contact Eaton for product rating.
FrameAmperes
Breaker TypeCatalogNumber
FrameType
rms Symmetrical Current Ratings kA 50/60 Hz Available Current Sensorand Rating Plugs for DigitripRMS Trip Unit (EstablishesBreaker InRating)
Interruptingat 254 Vac
Interruptingat 508 Vac
Interruptingat 635 Vac
Short-TimeWithstandRating
Fixed InternalInstantaneousTrip
800 MDN-408MDN-508MDN-608MDN-C08
NarrowNarrowNarrowNarrow
42 50 65100
42 50 65100
42 50 65 65
42 50 65 20
18 x In
200, 250, 300, 400, 600, 800
MDS-408MDS-608MDS-808MDS-C08MDS-L08
StandardStandardStandardStandardStandard
42 65 85100200
42 65 85100200
42 65 85100200
42 65 85 85
85
1200 MDN-412MDN-512MDN-612
NarrowNarrowNarrow
42 50 65
42 50 65
42 50 65
42 50 65
200, 250, 300, 400, 600, 800,1000, 1200
MDS-412MDS-512MDS-612MDS-812MDS-C12MDS-X12
StandardStandardStandardStandardStandardStandard
42 50 65 85100200
42 50 65 85100200
42 50 65 85100 65
42 50 65 85 85 30
1600 MDN-416MDN-516
MDN-616MDN-C16
NarrowNarrow
NarrowNarrow
42 50
65100
42 50
65100
42 50
65 65
42 50
65 30
18 x In
200, 250, 300, 400, 600, 800,1000, 1200, 1600
MDS-616MDS-816MDS-C16MDS-L16
MDS-X16
StandardStandardStandardStandardStandard
65 85100200200
65 85100200200
65 85100200
65 85 85 30
8530
2000 MDN-620MDN-C20
NarrowNarrow
65100
65100
65 65
65 35
18 x In
200, 250, 300, 400, 600, 800,1000, 1200, 1600, 2000
MDS-620MDS-820MDS-C20MDS-L20
MDS-X20
StandardStandardStandardStandardStandard
65 85100200200
65 85100200200
65 85100200
65 85 85 30
8530
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Power Circuit Breakers
Magnum DS Low Voltage Power Circuit Breakers010
Table 26.1-2. Magnum DS Switchgear Class UL 1066 Low Voltage Power Circuit Breakers (Continued)
Interrupting ratings shown based on breaker equipped with integral Digitrip RMS trip unit. Interruption ratings for non-automatic breakers are equal to thepublished short-time withstand rating. These interruption ratings are based on the standard duty cycle consisting of an open operation, a 15-second inter-val and a close-open operation, in succession, with delayed tripping in case of short-delay devices. The standard duty cycle for short-time ratings consistsof maintaining the rated current for two periods of 1/2 seconds each, with a 15-second interval of zero current between the two periods.
Magnum MDSL current limiting power circuit breaker with integral current limiters. Current limiter selected determines short-time and fixedinstantaneous trip rating. Maximum voltage rating is 600 Vac.
Product to be tested. Contact Eaton for product rating. Magnum MDSX fuseless current limiting power circuit breakers with fast opening contacts. SeeTable 26.1-1on Page 26.1-6for peak let-through chart. Breaker applied in a tested fan-cooled enclosure.
FrameAmperes
Breaker TypeCatalogNumber
FrameType
rms Symmetrical Current Ratings kA 50/60 Hz Available Current Sensorand Rating Plugs for DigitripRMS Trip Unit (EstablishesBreaker InRating)
Interruptingat 254 Vac
Interruptingat 508 Vac
Interruptingat 635 Vac
Short-TimeWithstandRating
Fixed InternalInstantaneousTrip
3200 MDS-632
MDS-832MDS-C32
Standard
StandardStandard
65
85100
65
85100
65
85100
65
85 85
85
200, 250, 300, 400, 600, 800,
1000, 1200, 1600, 2000, 2500,3000, 3200
MDS-X32 Double 200 200 50 50
4000 MDN-640MDN-840MDN-C40
Double narrowDouble narrowDouble narrow
65 85100
65 85100
65 65 65
65 85100
2000, 2500, 3200, 4000
MDS-840MDS-C40MDS-X40
MDD-X40
DoubleDoubleDoubleDouble
85100200200
85100200200
85100
100
85100 50100
50
5000 MDS-850MDS-C50MDS-X50
MDD-X50
DoubleDoubleDoubleDouble
85100200200
85100200200
85100
100
85100 50100
50
2500, 3200, 4000, 5000
6000 MDS-C60
MDD-X60DoubleDouble
100200
100200
100100
100100
3200, 4000, 5000, 60002500, 3200, 4000, 5000
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26September 2011
Power Circuit Breakers & Insulated-Case Circuit Breakers
Sheet 26
Power Circuit Breakers
Magnum DS Low Voltage Power Circuit Breakers011
Magnum MDSXFuseless Current LimitingPower Circuit Breakers
Magnum MDSX
Magnum MDSX Current LimitingPower Circuit Breakers have fastopening contacts to provideinterrupting ratings up to 200 kAat 508 Vac without fuses. Theinterruption performance is currentlimiting when the fault currents exceedthe short-time current rating. The self-protecting fast opening reverse loopcontacts quickly open, clearing thefault in approximately 1/4 cycle,reducing energy let-through and arcflash energy. Below their short-timecurrent rating, MDSX breakerscoordinate like standard MDS breakers.
Arc flash levels to the downstreamcircuit can be reduced by employingthe trip unit instantaneous settings aswell as ground fault, zone interlocking,and Arcflash Reduction MaintenanceSystem features. MDSX breakers
have the same compact footprint asstandard MDS breakers. MDSXimproves overall operating systemcontinuity, convenience and life cyclecosts by eliminating fuse trucks, blownlimiter change outs, replacementlimiter inventories and the higheroperating watts loss associatedwith fuses.
Figure 26.1-1. Magnum Let-Through Data
1000
100
10
10,000 100,000
Ipeak(kA)
MagnumLet-Through
DataIpeak
1,000,000
AsymmetricalAvailable Peak 15%
PF
MDS-X50 5000AMDS-X40 4000AMDS-X32 3200A
MDS-X20 2000AMDS-X16 1600AMDS-X12 1200A
Available Fault Circuit Current (Amperes)
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September 2011
Power Circuit Breakers & Insulated-Case Circuit Breakers
Sheet 26
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Power Circuit Breakers
Magnum DS Low Voltage Power Circuit Breakers012
Magnum MDSLFused Current LimitingPower Circuit Breakers
The following curves illustrate the ratings,
melting time-current characteristicsand current limiting, or let-throughcharacteristics, of limiters for Magnumlow voltage power circuit breakers.
The let-through current for a givenlimiter application is readily determinedby extending a vertical line from theapplicable maximum available sym-metrical fault amperes at the bottommargin to the characteristic line forthe particular limiter, and from thisintersection extending a horizontal lineto the left margin and reading the peakcurrent. The withstand rating of anycircuit elements protected by thelimiters should be at least equal to
this peak current.
It will be noted that the let-throughcurrent increases with the limiter sizeor ampere rating; in other words, themaximum current limiting effect isobtained with the smallest size. Thiseffect is to be expected, because theresistance decreases as the ratingincreases. If the vertical line from thebottom margin as described in theprevious paragraph does not intersectthe limiter characteristic line, the avail-able system fault current is below thethreshold current of that limiter, andit will offer no current limiting effect.
The current limiting principle isillustrated below:
la = The Available Peak Fault Current
tm = The Melting Time
Ip
= The Peak Let-Through Current
ta = The Arcing Time
tc = The Total Interrupting (Clearing)Time
Figure 26.1-2. Current Limiting
Limiter SelectionThe selection of a suitable limiterrating for a given application isgenerally governed by a choice ofthe following types of protection:
A. Maximum protection of down-stream components. Type MDSLbreakers are often used for thispurpose even when the maxi-mum available fault currents arewithin the interrupting ratingof the corresponding unfusedMagnum breakers.
B. Protection of the circuit breaker only.
Case A would tend to use the smallestavailable limiter; Case B the largest.When downstream protection isrequired, the selection is usuallya compromise, because certain smalllimiters cannot be coordinated with
the breaker to avoid nuisance blowingon overloads or small and moderateshort circuits.
Minimum, recommended andmaximum limiter sizes for MagnumMDSLbreakers are given in thetable below.
Table 26.1-3. Magnum MDSL Ratings
Table 26.1-4. Magnum MDSL Sensor/Rating Plug vs.Current Limiter Selection
Select the current limiter based on the Magnum breaker frame and current sensor and rating plug as shown. Refer to MDSL current limiter curves for let-through and time characteristics. The recommended ratings shown as shaded provide for reduced current let-through and breaker coordination within the trip unit settings.
Selection of current limiters below the recommended ratings shown provides lower current let-through; however, trip unit settings must beconsidered to avoid nuisance operation.
Ia
Ip
tc
tm ta
Frame Available Sensor/Rating Plug (Amperes)
CatalogNumber
800 200, 250, 300, 400, 600, 800 MDSL08
1600 200, 250, 300, 400, 600,800, 1000, 1200, 1600
MDSL16
2000 1600, 2000 MDSL20
Sensor andRating Plug In
MDSL Current Limiter Selection Chart
200 MA250 MA300 MA400 MA600 MA800 MB1200 MB1600 MB2000 MD2500 MD3000
250 MA400 MA600 MA800 MB1200 MB1600 MB2000 MD2500 MD3000
300 MA400 MA600 MA800 MB1200 MB1600 MB2000 MD2500 MD3000
400 MA600 MA800 MB1200 MB1600 MB2000 MD2500 MD3000
600 MA800 MB1200 MB1600 MB2000 MD2500 MD3000
800 MB1200 MB1600 MB2000 MD2500 MD3000
1000 MB1600 MB2000 MD2500 MD3000
1200 MB2000 MD2500 MD3000
1600 MD3000
2000 MD3000
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26.1September 2011
Power Circuit Breakers & Insulated-Case Circuit Breakers
Sheet 26
Power Circuit Breakers
Magnum DS Low Voltage Power Circuit Breakers013
Figure 26.1-3. Type Magnum DSL Limiters, Peak Let-ThroughCurrent Characteristics
Figure 26.1-4. Type Magnum DSL Limiters Average MeltingTime-Current Characteristics
10090807060
50
40
30
20
1098765
4
3
2
1.9.8.7.6.5
.4
.3
.2
.1.09.08.07.06.05
.04
.03
.02
100
200
300
400
500
600700
800
900
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
20000
30000
40000
50000
60000
70000
80000
90000
100000
Pea
kIns
tan
taneous
Le
t-Throug
hCurren
tinKilo
Amper
es
X10
MD3000MD2500MD2000MD1600MD1200MA800
MA600
MA400MA300MA250
Available Current, rms Symmetrical Amperes x 10
1000900800700600500400
300
200
100908070605040
30
20
10987654
3
2
1.9.8.7.6.5.4
.3
.2
.1.09.08.07.06.05.04
.03
.02
.01
1 2 3 4
6 7 8 910 20
30
405060708090100
200
300
400500600700800900
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
5
TimeinSeconds
MA250
MA300
MA400
MA500
MA800
MB1200MB1600
MB2000
MB2500
MB3000
Current in Amperes x 100
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September 2011
Power Circuit Breakers & Insulated-Case Circuit Breakers
Sheet 26
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Insulated-Case Circuit Breakers
Magnum SB Insulated-Case Circuit Breakers014
Magnum SBLow Voltage Insulated-CaseCircuit Breakers
Magnum SB Low Voltage Insulated-CaseCircuit Breakers are Designed for thePerformance and Economic Requirementsof UL 891 Switchboards
Typical Magnum SB Low VoltageInsulated-Case Circuit Breaker Nameplate
Magnum SB is a low voltage insulated-case circuit breaker family designedfor the performance and economicrequirements of UL 891 switchboards.
Magnum SB insulated-case circuitbreakers have Interruption ratings
up to 100 kA at 635 Vac with contin-uous current ratings up to 6000A
Magnum SB insulated-case circuitbreakers have lighter-duty short-time current ratings and fixedinternal instantaneous trips onmost ratings, which is characteristicof UL 489 molded-case breakerscommonly used in UL 891 switch-boards. This provides for greatereconomy and excellent coordinationand selectivity for most commercialapplications
Fixed internal instantaneous tripsare included on all SB insulated-casecircuit breakers rated 3200A andbelow to provide an extra safetyfactor by reducing the energy let-through to downstream circuits atthe maximum instantaneous trippoint and to facilitate feeder circuitbreaker protection in UL 891 switch-boards with 3-cycle bus bracing
Magnum SBSE current limitingpower circuit breakers have 150 kAinterrupting ratings at 480 Vac withcontinuous current ratings up to5000A. The short-time current ratingis 30 kA for standard frame and50 kA for double frame breakers
UL and ANSI Test Certifications
Magnum SB meets or exceeds theapplicable ANSI, NEMA, UL and CSAstandards, including:
ANSI C37.13 (low voltage AC power
circuit breakers used in enclosures) ANSI C37.16 (preferred ratings,
related requirements, andapplication recommendations forlow voltage power circuit breakersand AC power circuit breakers)
ANSI C37.17 (trip devices for ACand general purpose DC low voltagepower circuit breakers)
ANSI C37.50 (test proceduresfor low voltage AC power circuitbreakers used in enclosures)
UL 1066 (standard for low voltageAC and DC power circuit breakersused in enclosures)
NEMA SG3 (this standard adoptsANSI C37.16 in its entirety)
ComprehensiveEnclosure Solutions
Magnum SB has proven performancein Eaton manufactured switchboardswith the following test certifications:
UL 891 (Drawout Magnum SBand Pow-R-Line C low voltageswitchboards)
UL, CSA 22.2.31 low voltageassemblies
Approvals
UL listed: Magnum SB breakerUL File E52096 and cassetteUL File E204565
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26.1September 2011
Power Circuit Breakers & Insulated-Case Circuit Breakers
Sheet 26
Insulated-Case Circuit Breakers
Magnum SB Insulated-Case Circuit Breakers015
Magnum SB Switchboard Class Insulated-Case
Magnum SB Low Voltage Insulated-Case Circuit Breaker Family UL Rated for Switchboard Applications
Table 26.1-5. Magnum SB Switchboard Class Insulated-Case Low Voltage Air Circuit Breakers
Interrupting ratings shown based on breaker equipped with integral Digitrip RMS trip unit. Interruption ratings for non-automatic breakers areequal to the published short-time withstand rating. These interruption ratings are based on the standard duty cycle consisting of an open operation,a 15-second interval and a close-open operation, in succession, with delayed tripping in case of short-delay devices. The standard duty cycle forshort-time ratings consists of maintaining the rated current for two periods of 1/2 seconds each, with a 15-second interval of zero current betweenthe two periods.
Product to be tested. Contact Eaton for product rating. Magnum SBSE Current Limiting Power Circuit Breaker with fast opening contacts. Breaker applied in a tested fan-cooled enclosure.
Note: Magnum SB is UL 1066 listed.
FrameAmperes
Breaker TypeCatalogNumber
FrameType
rms Symmetrical Current Ratings kA 50/60 Hz Available Current Sensor andRating Plugs for DigitripRMS Trip Unit (EstablishesBreaker InRating)
Interruptingat 254 Vac
Interruptingat 508 Vac
Interruptingat 635 Vac
Short-TimeWithstand Rating
Fixed InternalInstantaneous Trip
800 SBN-508SBN-608SBN-C08
NarrowNarrowNarrow
50 65100
50 65100
35 42 65
20 20 20
18 x In18 x In18 x In
200, 250, 300, 400, 600, 800
SBS-608SBS-C08
StandardStandard
65100
65100
65 85
20 20
18 x In18 x In
1200 SBN-512SBN-612SBN-C12
NarrowNarrowNarrow
50 65100
50 65100
35 42 65
25 25 25
18 x In18 x In18 x In
200, 250, 300, 400, 600, 800,1000, 1200
SBS-612SBS-C12SBS-E12
StandardStandardStandard
65100200
65100150
65 85
25 25 30
18 x In18 x In30
1600 SBN-516SBN-616SBN-C16
NarrowNarrowNarrow
50 65100
50 65100
35 42 65
30 30 30
18 x In18 x In18 x In
200, 250, 300, 400, 600, 800,1000, 1200, 1600
SBS-616SBS-C16SBS-E16
StandardStandardStandard
65100200
65100150
65 85
30 30 30
18 x In18 x In30
2000 SBN-620SBN-C20
NarrowNarrow
65100
65100
65 65
35 35
18 x In18 x In
200, 250, 300, 400, 600, 800,1000, 1200, 1600, 2000
SBS-620SBS-C20SBS-E20
StandardStandardStandard
65100200
65100150
65 85
35 35 30
18 x In18 x In30
2500 SBS-625SBS-C25
StandardStandard
65100
65100
65 85
45 45
18 x In18 x In
200, 250, 300, 400, 600, 800,1000, 1200, 1600, 2000, 2500
SBS-E25 Double 200 150 50 50
3000 SBS-630SBS-C30
StandardStandard
65100
65100
65 85
50 50
18 x In18 x In
200, 250, 300, 400, 600, 800,1000, 1200, 1600, 2000,2500, 3000SBS-E30 Double 200 150 50 50
4000 SBS-840SBS-C40SBS-E40
DoubleDoubleDouble
85100200
85100150
85100
85100 50
18 x In18 x In50
2000, 2500, 3000, 4000
5000 SBS-850SBS-C50
SBS-E50
DoubleDouble
Double
85100
200
85100
150
85100
85100
50
18 x In18 x In
50
2500, 3000, 4000, 5000
6000 SBS-C60 Double 100 100 100 100 18 x In 3000, 4000, 5000, 6000
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Power Circuit Breakers & Insulated-Case Circuit Breakers
Sheet 26
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Breaker-Mounted Options
Magnum DS and SB Breaker-Mounted Options016
Breaker-Mounted Options
Magnum breakers are available witha comprehensive array of factory-installed breaker options to enableconfigured-to-order solutions for
specified customer requirements.Field option kits are available toprovide easy service, modificationand customization of the breaker atthe point of use.
Shunt trip device(ST). Providesfor remote electrically controlledbreaker opening when energizedby a rated voltage input
Spring charge motor (MOT).Charges the breaker closing springsautomatically, facilitating remote orlocal closing. The motor assemblyincludes its own cut-off switchthat changes state at the end of thecharging cycle. This contact can bewired out for external indication
Spring release device(SR).Provides for remote electricallycontrolled breaker closing whenits coils are energized by a ratedvoltage input
Undervoltage release(UVR).Trips the breaker when an existingvoltage signal is lost or fallsbelow an established threshold
Auxiliary switch. Up to 6a/6bauxiliary individual dedicatedcontacts are available for customeruse to indicate if the breaker is inthe OPEN or CLOSE position
Mechanical trip indicator flag .The red trip indicator flag pops outto provide local visual indicationwhen the Digitrip RMS trip unitacts to trip the breaker on anovercurrent condition. Availablein two options: an interlockedversion that mechanicallylocks out the breaker until theindicator is manually reset anda non-interlocked version forindication only
Bell alarm/overcurrent trip switch (OTS). Provides two Form C con-tacts that change state when theDigitrip RMS trip unit acts to trip thebreaker. The contacts are availablefor external indication or customer
use and are manually reset by themechanical trip indicator
Padlockable pushbutton cover.Permits padlocking hinged coverplates to block access to the PUSHON and PUSH OFF buttons on thebreaker faceplate
Mechanical operations counter.Records mechanical operations ofthe breaker over its installed life
Key off lock provisions. Enablesmounting of a single cylinder Kirk,Castell or Ronis Key Lock to lock thebreaker in the OPEN position
Latch check switch. Provides oneForm C contact that changes state
when the breaker is ready to close.Can be wired to the spring releasedevice for fast transfer applicationsor wired for external ready-to-closeindication
Shunt Trip, Spring Release andUndervoltage Release DeviceInstalled on Accessory Deck
Auxiliary Switches Come in Modular 2a/2bContact Stages Providing up to 6a/6bDedicated Contacts
Mechanical Trip Indicator withBell Alarm (OTS) Switches Mounted
For the Digitrip RMS 1150+ trip unit, otherprotective functions, if programmed, willcause the OTS and mechanical trip indicatorflag to operate.
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26.1September 2011
Power Circuit Breakers & Insulated-Case Circuit Breakers
Sheet 26
Microprocessor Trip Units
General DescriptionMagnum DS and SB Trip Units017
Digitrip RMS Trip Unit Familyfor Magnum Circuit Breakers
The Magnum family of Digitrip RMStrip units consists of four trip unitmodels, each providing increasing
levels of features and options toenable the ultimate selection tomatch application requirements forprotection, coordination, information,diagnostics and communication:
Digitrip RMS 520
Digitrip RMS 520M
Digitrip RMS 520MC
Digitrip RMS 1150+
Common Trip Unit FeaturesA summary of the important featurescommon to all Magnum trip units isas follows:
Microprocessor-based truerms sensing
Discrete rotary or programmablesettings
Unit status LED (green)
Cause of trip LEDs (red)
Battery check LED (green)
Reset/battery test pushbutton
Making current release
Thermal memory
Over-temperature protective trip
Zone selective interlocking (ZSI)provisions
Rating plug receptacle
Backup battery for cause oftrip LEDs
Test kit receptacle with cover
Plug-in mounting for easyreplacement
Clear plastic cover (sealable)
Digitrip RMS trip units are highlyaccurate microprocessor-basedprotective devices that use a samplingalgorithm to compute true rms valuesfor precise system coordination andmetering. The trip unit is completelyself-contained and requires noexternal control power to perform
its overcurrent protective functionsbecause the power to operate thetrip unit is derived from the primarycurrent passing through the currentsensors. When the trip unit is operat-ing, the green unit status LED beginsto blink like a heartbeat to visiblyconfirm the microprocessor ispowered up.
The trip unit overcurrent protectivepickup settings are a function of thebreaker In rating, which is establishedby the rating plug and current sensors.When preset conditions are exceeded,the trip unit initiates a trip signal to
the trip actuator, tripping the circuitbreaker. Red cause-of-trip LEDs lightup to indicate the cause of trip,powered by a easily replaceablebackup battery located behind therating plug. The LED will flash tosave power, until the trip unit resetbutton is depressed.
All trip units include three importantself-protecting safety features that areprovided as standard:
Making Current Release (MCR):employs a fast-acting analog instanta-neous trip that prevents the breakerfrom closing and latching on a fault
when the peak current exceeds 25 xthe breaker Inrating. This reduces arcflash energy during breaker closing forfaults within the self-protecting range.The MCR is enabled for the first twocycles following the circuit breakerclosing operation and thereafter,depending on the type of Magnumbreaker applied, becomes inactive.
Over-Temperature Protective Trip:automatically trips the breaker whenthe temperature inside the trip unitexceeds 85C, which indicates thatthere are significantly highertemperatures within enclosure.
Thermal Memory: provides over-temperature protection on load circuitsagainst effects of repeated overloadconditions. This feature is defeatablefor special applications such aswelding and primary injection testing.
Trip Units
Eatons electrical sector introduced thefirst microprocessor-based trip unitand has advanced the technologyinto a new family of UL and CSAlisted Digitrip RMS electronic andprogrammable trip units designedand engineered exclusively for
Magnum DS breakers.
Electronic Trip Units
Digitrip RMS 520 enables theuser as many as nine phase andground current protection settingsfor maximum flexibility in trip-curve shaping and multi-unitcoordination, and adds groundcurrent protection settings
Digitrip RMS 520M adds phase,neutral and ground currentmetering with a four-characterLCD display window
Digitrip RMS 520MC addscommunication of current values
and breaker status (open, closed,tripped), and Arcflash ReductionMaintenance System for arc flashreduction
Programmable Trip Units
Digitrip RMS 1150+ providesprogrammability for moresophisticated distribution systems
Increased protection andcoordination capabilities
Systems monitoring informationincluding power factor, voltage,current, harmonic distortion
values and waveform capturewith a bright three-line, (eightcharacters per line) LED display
Two programmable contacts forcustomer use
Time and date stamping of tripevents for improved trouble-shooting and diagnostics
Accuracy of 1% on current andvoltage values and 2% on energyand power
Systems diagnostic informationand breaker health menu
Communications
Arcflash Reduction MaintenanceSystem for arc flash reduction
Magnum 520MC Trip Unit withArcflash Reduction MaintenanceSystem, Four-Digit LCD Display andAmpere-Based Communications
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Power Circuit Breakers & Insulated-Case Circuit Breakers
Sheet 26
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Microprocessor Trip Units
General DescriptionMagnum DS and SB Trip Units018
Magnum 1150+ Trip Unit with Arcflash
Reduction Maintenance System, 24-DigitLED Display, Programmable Protection,Alarms and Relaying, Power Metering,Power Quality and Alarms, WaveformCapture, Communications and BreakerHealth Monitoring
Arcflash ReductionMaintenance System
The Arcflash Reduction MaintenanceSystem Maintenance Mode functionof the Digitrip 520MC and 1150+ canreduce arc flash incident energy thatis generated on a fault condition. Thisis accomplished by an analog tripcircuit that, when armed, provides afast-acting response to the fault. Thisis separate from the normal systemprotection setting of instantaneous.
Eatons Arcflash ReductionMaintenance System employs aseparate, dedicated analog tripcircuit that eliminates microprocessorlatencies, resulting in clearing timesthat are faster than standard instanta-neous tripping. This provides superiorarc flash reduction to competitorssystems that simply lower the standardinstantaneous pickup set point.
There are three ways to arm theMaintenance Mode ArcflashReduction Maintenance Systemsetting. One method is locally at thetrip unit front panel. For the 520MC, thetwo-position switch in the MaintenanceMode section of the trip unit is used.Turning the switch to the ON positionwill arm the setting. For the 1150+, thelocal front keypad is used to enable theMaintenance Mode setting. The settingis located in the SYSTEM submenu ofprogrammable settings (PGM SET).
For the second method of arming theMaintenance Mode function, a remoteswitch wired through the breakersecondary contacts can remotelyarm the Maintenace Mode setting. Ahigh-quality gold-plated or palladium
contact is required in this application.A third method to arm theMaintenance Mode setting is viaa communication device. There isa confirmation screen that verifiesthe arming. A BIM (Breaker InterfaceModule) or Power Xpertsystemare communication methods to armthe setting.
The Arcflash Reduction MaintenanceSystem setting has five unique settings(2.5, 4.0, 6.0, 8.0, 10.0 x In). To adjust thissetting, a rotary switch on the trip unitface is provided for the 520MC while the1150+ trip unit uses its local keypad.
For all three arming methods, the520MC provides a blue LED to confirmthe Maintenance Mode function is on.In addition, there is also a normallyopen breaker contact that allows theuser to wire in an external stacklight or
annunciator for remote indication. Forthe 1150+, the message MaintenanceMode Enabled will be shown on itsLED display. The 1150+ also has analarm relay that can be programmedto track the Maintenance Mode state.
The maintenance mode function willprovide fast tripping even when theregular Instantaneous is set to OFF.The instantaneous LED position isalso used to indicate a trip initiatedby the Maintenance Mode setting.The 520MC LCD display, if powered,will indicate with four dashes whilethe 1150+ will display the messageMaintenance Mode Trip.
Figure 26.1-5. Arcflash Reduction Maintenance SystemTypical Time Current Curve withMaintenance Mode
Time
Current102.5 to 10
Times In
40 msec
MaintenanceMode
Total Clearing Time
40 msec
OptionalInstantaneous
InstantaneousTotal Clearing Time
60 to 75 msec
LDT @ 6X IrTypical 2 to 20 Sec
SDPV = 2 to 10 Times Ir
SDTTypical 0.1, 0.2,0.3, 0.4, 0.5 Sec
LDPUTypical Inx 0.4 to 1.0
Typical at 480V, 60 Hz
In= Rating Plug/Sensor RatingI
60 to 75 msec Maintenance Mode
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26.1September 2011
Power Circuit Breakers & Insulated-Case Circuit Breakers
Sheet 26
Microprocessor Trip Units
General DescriptionMagnum DS and SB Trip Units019
Figure 26.1-6. Maintenance Mode Wiring Digitrip 520MC
ControlVoltage 4
5
L
RemoteIndicator(BlueLight)
Communication wiring to BIM,MODBUS MINT or Power Xpertcomputer. This can activateMaintenance Mode if desired.
Remote Arcflash Reduction
Maintenance System SwitchArcflash ReductionMaintenanceSystem Switch
Alternate CustomerWiring (Partial)
Magnum Breaker (with MM wiring)
7
7
3
61
3
1
2
B7A12B7A12A15 A14 A9A10 B1 B2
The Digitrip 520MC (Cat 5ARMxxx) can locally be placed in Maintenance Mode via a two-position switch located on the trip unit. The function canalso be armed via a remote switch as shown. In addition, the function can be activated via communications. A blue LED on the Digitrip verifiesthe Digitrip is in Maintenance Mode.
The recommended selector switch for this low voltage application is Eaton part number 10250T1333-2E, which includes a contact block rated forlogic level and corrosive use.
The maximum length of this wiring to remote Arcflash Reduction Maintenance System switch (or alternate relay contact) is 9.78 ft (3m). Use#20 AWG wire or larger.
Control voltage is 120 Vac or 230 Vac or 2448 Vdc or 125 Vdc. Check Magnum circuit breaker front cover for trip unit power requirements. A remote stack light, annunciator panel or other remote indication device can be connected to verify that the Digitrip is in Maintenance Mode. Relay in (GF alarm/PS module) makes when in Maintenance Mode. Contact is rated 1A at 120 Vac or 0.5A at 230 Vac or 1A at 2448 Vdc and
0.35A at 125 Vdc. The Digitrip 520MC can also be placed remotely in its Maintenance Mode via a general purpose relayice cube type with logic level contacts
activated by remote control switch. A recommended type is IDEC Relay RY22. Choose voltage as desired.
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Power Circuit Breakers & Insulated-Case Circuit Breakers
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Microprocessor Trip Units
General DescriptionMagnum DS and SB Trip Units020
Digitrip 520 Trip Unit
Digitrip 520 Trip Unit withBasic Overcurrent Protection
The Digitrip 520 is a simple basictrip unit with three available typesof protection (LI, LSI and LSIG).
Up to nine rotary-type current andtime settings provide for maximumflexibility in curve-shaping andmulti-unit coordination.
The Instantaneous function (I)includes an off position settingwhen Short Time (S) protection isprovided to increase applicationflexibility in the field
I2t time delay settings for bettercurve shaping when Short Time (S)and Ground Fault (G) protectivefunctions are selected
Zone Selective Interlocking (ZSI)provided when Short Time (S)
and/or Ground Fault (G) protectivefunctions are selected. ZSI provideshard-wired positive system coordi-nation, allowing the breaker closestto the fault to trip first, thus avoidingunnecessary and costly systemdowntime. ZSI is a useful methodto reduce arc flash
Digitrip 520M Trip Unit
Digitrip 520M Trip Unit with Four-DigitLCD Display and Ampere-based Metering,Alarms and System Diagnostics
The Digitrip 520M is available withthree types of protection (LSI, LSIG
and LSIA) and includes the followingadded features:
Four-digit LCD display with a steppushbutton to scroll through thedisplay data, including ampere-based metering of phase, neutraland ground currents, plusoperational and cause-of-tripdiagnostic information
When specified, the Power RelayModule (PRM) is supplied toperform the following features:
Power up the trip unit displayfrom an external customersupplied source through the
breaker secondary contacts toretain the cause-of-trip andmagnitude of trip information
Provide relay contact for remoteindication of overload (LSI) orground trip (LSIG) or groundalarm (LSIA)
Type LSIA units alarm only whenground fault settings are exceeded,which is quite useful in criticalpower applications
Plug receptacle for auxiliary powermodule to power up the trip unitdisplay during bench testing remotefrom the switchgear
Digitrip 520MC Trip Unit
Digitrip 520MC Trip Unit WithArcflash Reduction MaintenanceSystem, Four-Digit LCD Displayand Ampere-based Communications
The Digitrip 520MC is available in
three types of protection (LSI, LSIGand LSIA) and includes the followingenhancements:
Communications of ampere-baseddata, breaker status and cause-of-trip information using the INCOMcommunications system. Each tripunit has a unique hexadecimaladdress (001 to 999) set by rotaryswitches. A red transmit LED isprovided to confirm communica-tions activity. Peripheral translatordevices are available to convertINCOM to other protocols likeModbus, Ethernet and so on
Arcflash Reduction MaintenanceSystem allows the operator to enablea special trip unit maintenancemode with a preset acceleratedinstantaneous override trip that canreduce arc flash energy up to 30%.This accelerated tripping resultsin total clearing times that arefaster than standard instantaneoustripping. The arc flash reduction levelis preset at the trip unit using a five-position switch that facilitates themaximum arc flash reduction settingpossible while avoiding nuisancetripping. The Arcflash ReductionMaintenance System can be turnedon locally at the trip unit, remotelyusing peripheral devices, or viacommunications. A blue LEDprovides local indication the trip unitis in the Maintenance Mode. Remoteindication can be accomplished bya dedicated trip unit contact for usewith a stack light or annunciatorpanel, or via communications
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26.1September 2011
Power Circuit Breakers & Insulated-Case Circuit Breakers
Sheet 26
Microprocessor Trip Units
General DescriptionMagnum DS and SB Digitrip Trip Units021
Digitrip 1150+ Trip Unit
Digitrip 1150+ Trip Unit
The Digitrip 1150+ trip unit is a highlyadvanced programmable protectivedevice available in three types ofprotection (LSI, LSIG and LSIA).
The following is a first level summaryof the special features and options:
24-character LED digital displayeasily visible from 50 feet and idealfor dark equipment environments
Membrane type dust-resistantkeypad pushbuttons to facilitatelocal unit programming, includingview functions (Up, Down, ESCape,SELect and Reset), edit values(Up, Down and Save) andbattery test
Programmable trip unit settingsand curves including I2t and I4tcurves, as well as IEEE moderatelyinverse, very inverse and extremelyinverse curves
Voltage and power metering
Power quality monitoring and alarmwith THD and waveform capture
Health menuThe health menuon the Digitrip 1150+ front panel willprovide information on the Magnumcircuit breakers health, as well asa history of the circuit breaker andcircuit it is protecting. This data is
useful for planning maintenanceand inspection schedules. The typeof data includes the total number ofall instantaneous and short delaytrips seen by the circuit breaker. Asecond counter shows the numberof overloads (LDT) and groundfaults (GFT) encountered while inservice. The OP count provides dataon the number of close operationsexperienced by the circuit breaker.The last time the circuit breaker wasoperated (open or closed or tripped)is viewable with time and datedisplayed. Also included is themaximum temperature in degreesCentigrade as seen by the Digitripmicroprocessor CHip. The captureof the data requires externaltrip unit power. This data, oncecaptured, is stored in non-volatilememory. These features are avail-able for remote communications
Programmable alarm contacts ortrip contacts
Programmable relay functionsincluding undervoltage, overvoltage,underfrequency, overfrequency,reverse power, voltage unbalanceand phase rotation
Communications of comprehensiveaccess to trip unit capabilitiesincluding programmable settings,breaker control, metering, alarm,status, relaying and diagnosticinformation. Peripheral translator
devices are available to convertINCOM to other protocols likeModbus, Ethernet and so on
Accessory bus for use withperipheral digital relay modulesthat can be programmed throughthe trip unit keypad for additionalauxiliary and various alarm contacts
Arcflash Reduction MaintenanceSystem allows the operator to enablea special trip unit MaintenanceMode with a preset acceleratedinstantaneous override trip that canreduce arc flash energy up to 30%.This accelerated tripping results intotal clearing times that are faster
than standard instantaneoustripping. The arc flash reductionlevel is preset at the trip unit for themaximum arc flash reduction settingpossible, while avoiding nuisancetripping. The Arcflash ReductionMaintenance System can be turnedon locally at the trip unit, remotelyusing peripheral devices, or viacommunications. The displayprovides local indication the trip unitis in the Maintenance Mode. Remoteindication can be accomplished bya dedicated trip unit contact for usewith a stack light or annunciatorpanel, or via communications
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For more information, visit: www.eaton.com/consultants CA08104001E
September 2011
Power Circuit Breakers & Insulated-Case Circuit Breakers
Sheet 26
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Microprocessor Trip Units
Selection GuideMagnum DS and SB Digitrip Trip Units022
Table 26.1-6. Digitrip Trip Units for Magnum DS and SB ANSI/UL Rated Power Circuit Breakers
Over and undervoltage alarm or trip, overand underfrequency alarm or trip, voltageunbalance alarm or trip, reverse power trip,and phase rotation alarm are included.
1200A maximum ground fault setting perUL/NEC.
Test set for secondary injection.
Legend: In = Rating Plug and Sensor Rating.Ir = Long Delay Pickup setting.
Trip Unit Type Digitrip 520 Digitrip 520M Digitrip 520MC Digitrip 1150+
Ampere rangeInterrupting rating at 480Vrms sensing
2006000A42200 kAYes
2006000A42200 kAYes
2006000A42200 kAYes
2006000A42200 kAYes
Protection and Coordination
Protection Ordering optionsFixed rating plug (In)Overtemperature trip
LI, LSI, LSIGYesYes
LSI, LSIG, LSIAYesYes
LSI, LSIG, LSIAYesYes
LSI, LSIG, LSIAYesYes
Longdelayprotection(L)
Long delay pickupLong delay time I2t at 6 x IrLong delay time I4tIEEE curves
0.41.0 x (In)224 secondsNoNo
0.41.0 x (In)224 secondsNoNo
0.41.0 x (In)224 secondsNoNo
0.41.0 x (In)224 seconds15 secondsYes
Long delay thermal memoryHigh load alarm
YesNo
YesNo
YesNo
Yes0.51.0 x (Ir)
Shortdelayprotection(S)
Short delay pickupShort delay time I2t at 8 x IrShort delay time flatShort delay time ZSI
2001000% x (Ir) and M1100500 ms100500 msYes
2001000% x (Ir) and M1100500 ms100500 msYes
2001000% x (Ir) and M1100500 ms100500 msYes
2001000% x (Ir) and M1100500 ms100500 msYes
Instanta-neousprotection(I)
Instantaneous pickupMaking current releaseOff position
2001000% x (In) and M1YesLSI and LSIG
2001000% x (In) and M1YesYes
2001000% x (In) and M1YesYes
2001000% x (In) and M1YesYes
Groundfaultprotection(G)
Ground fault alarmGround fault pickupGround fault delay I2t at 0.625 x In
No25100% x (In)100500 ms
Yes25100% x (In)100500 ms
Yes25100% x (In)100500 ms
Yes24100% x (In)100500 ms
Ground fault delay flatGround fault ZSIGround fault thermal memory
100500 msYesYes
100500 msYesYes
100500 msYesYes
100500 msYesYes
Disable ground fault protection No No No No
Neutral protection (N) Model LSI Model LSI Model LSI Model LSI
System Diagnostics
Cause-of-trip LEDsMagnitude of trip information
YesNo
YesYes
YesYes
YesYes
Remote signal contactsProgrammable contacts
NoNo
YesNo
YesNo
YesYes
System Monitoring
Digital displayCurrent (% ) full scale sensor
NoNo
4-character LCDYes 2%
4-character LCDYes 2%
24-character LEDYes 1%
Voltage (%) L to LPower and energy (%)Apparent power kVA and demand
NoNoNo
NoNoNo
NoNoNo
Yes 1%Yes 2%Yes
Reactive power kVARPower factorCrest factor
NoNoNo
NoNoNo
NoNoNo
YesYesYes
Power qualityharmonics% THD, waveform capture
NoNo
NoNo
NoNo
YesYes
System Communications
TypePower supply in breaker
NoN/A
NoOptional
INCOMStandard
INCOM/TripLinkStandard
Additional Features
Trip log (three events)Electronic operations counter
NoNo
NoNo
NoNo
YesYes
Testing method
Waveform captureTest setNo
Test setNo
Test setNo
Integral and test setYes
Arcflash Reduction Maintenance SystemBreaker health monitorProtective relay functions
NoNoNo
NoNoNo
YesNoNo
YesYesYes
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26.1September 2011
Power Circuit Breakers & Insulated-Case Circuit Breakers
Sheet 26
Microprocessor Trip Units
Technical and Application Data023
Time-Current Curve Shaping
Figure 26.1-7. Time-Current Curve ShapingNote: See selection guide charts foravailability of adjustments.
Long Delay (L)
1. Long Delay PickupDetermines the continuousampere rating of the breaker.
2. Long Delay TimeDetermines the amount of timethe breaker will carry a low leveloverload before tripping.
a. I2t ResponseI2t in: For coordination with othercircuit breakers with electronictrip devices and for coordination
with thermal-magneticcircuit breakers.
b. I4t ResponseI4t in: For coordination withfuses and upstream trans-former damage curves.
Short Delay (S)
3. Short Delay PickupDetermine or set the level of faultcurrent at which the short-timetrip delay countdown is actuated.
4. Short DelaySets the amount of time the breakerwill carry both a low level and highfault currents before tripping.
a. Flat ResponseI2t out: For coordination withother circuit breakers withelectronic trip devices.
b. I2t ResponseI2t in: For coordination with fusesand thermal-magnetic breakers.
7B
7A
6
Time
5
1
4B
4A
2A
2B
2
3
Current in Multiples
4
7
Instantaneous (I)
5. Instantaneous PickupDetermines the level of faultcurrent that will actuate a trip withno time delay.
Ground Fault (G)
6. Ground Fault PickupDetermines the level of faultcurrent at which the ground faulttrip delay countdown is actuated.
7. Ground Fault DelayDetermines the amount of timethe breaker will carry a groundfault before tripping.
a. Flat ResponseI2t out: For coordination withother circuit breakers withelectronic ground fault settings.
b. I2t ResponseI2t in: For coordination withzero sequence ground fault
relays, fuses and thermal-magnetic breakers.
Feeder BreakersGeneral
Circuit breakers for feeder circuitprotection may be manually orelectrically operated, with longand short delay or long delay andinstantaneous type trip devices,and trip settings, as required for thespecific circuit and load requirements.
General purpose feeder breakers, such asfor lighting circuits, are usually equippedwith long delay and short delay tripdevices, with the long delay pickup set
for the maximum load demand in thecircuit. Where arcing fault protectionis required, add instantaneous tripwith setting as low as practicableconsistent with inrush requirements.As an option, the Arcflash ReductionMaintenance System can be selectedfor increased arc flash protectionduring maintenance.
Motor Starting Feeder Breakers
These breakers are usually electricallyoperated, with long delay, shortdelay and instantaneous trippingcharacteristics for motor running,locked rotor and fault protection.The breaker sensor rating should bechosen so that the long delay pickupcan be set at 125% of motor full loadcurrent for motors with a 1.15 servicefactor, or at 115% for all other motors.Contactors are recommended for thisapplication when circuit breaker dutycycle is exceeded.
Repetitive DutyRepetitive breaker opening andclosing, such as in frequent motorstarting and stopping, are coveredby ANSI standards C37.13 and C37.16.These standards list the number
of operations between servicing(adjusting, cleaning, lubrication,tightening and so on) and the totalnumbers of operations undervarious conditions without requiringreplacement of parts, for the variousbreaker frame sizes.
For motor starting duty, with closingstarting currents up to 600% and openingrunning currents up to 100% of thebreaker frame size, at 80% powerfactor or higher, the endurance ortotal operations (not requiring partsreplacement) will be as follows:
800A Frame: 1400 operations
1600A Frame: 400 operations
The frequency of operation should notexceed 20 starts in 10 minutes or 30 inone hour.
Group Motor Feeder Breakers
Typical loads for such circuits are motorcontrol centers. The feeder breakersmay be either manually or electricallyoperated as preferred, and are usuallyequipped with long and short delay tripprotection only for coordination withthe individual motor circuit devices.The minimum long delay pickup settingshould be 115% of the running current
of the largest motor in the group, plusthe sum of the running circuits of allother motors.
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For more information, visit: www.eaton.com/consultants CA08104001E
September 2011
Power Circuit Breakers & Insulated-Case Circuit Breakers
Sheet 26
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Microprocessor Trip Units
Technical and Application Data024
Zone Selective InterlockingZone selective interlocking providespositive system coordination by allowingthe breaker closest to the fault to tripwithout any preset time delays. This isachieved by setting up the distribution
system as shown in Figure 26.1-8.The hardwired connection betweenthe trip units sends a restrainingsignalupstream, allowing the breaker closestto the fault to act instantaneously.Zoneselective interlocking also reducesstress on the distribution system byisolating faults without time delays.
By definition, a selectively coordinatedsystem is one where by adjusting tripunit pickup and time delay settings, thecircuit breaker closest to the fault tripsfirst. The upstream breaker serves twofunctions: (1) backup protection to thedownstream breaker and (2) protectionof the conductors between the upstreamand downstream breakers. Theseelements are provided for on Digitriptrip units.
For faults that occur on the conductorsbetween the upstream and down-stream breakers, it is ideally desirablefor the upstream breaker to tripwith no time delay. This is thefeature provided by zone selectiveinterlocking. Digitrip trip units includethis option.
Zone selective interlocking is acommunication signal betweentrip units applied on upstream anddownstream breakers. Each trip unitmust be applied as if zone selectiveinterlocking were not employed, andset for selective coordination.
During fault conditions, each trip unitthat senses the fault sends a restrainingsignal to all upstream trip units. Thisrestraining signal results in causing theupstream trip to continue timing as itis set. In the absence of a restrainingsignal, the trip unit trips the associatedbreaker with no intentional time delay,minimizing damage to the fault point.This restraining signal is a very lowlevel. To minimize the potential forinduced noise, and provide a low
impedance interface between tripunits, twisted pair conductors areused for interconnection.
Ground fault and short delay pickupon Digitrip trip units have zoneselective interlocking.
Zone selective interlocking may beapplied as a type of bus differentialprotection. It must be recognized;
however, that one must accept theminimum pickup of the trip unitfor sensitivity.
It must also be recognized that notall systems may be equipped withzone selective interlocking. Systemscontaining multiple sources, or wherethe direction of power flow varies,require special considerations, or may
not be suitable for this feature. Digitripzone interlocking has been tested withup to three levels with up to 20 tripunits per level.
Figure 26.1-8. Zone Selective Interlocking
Zone 1
Zone 2
Zone 3
Fault 1
Fault 2
Fault 3
Load
BreakerNumber 1
BreakerNumber 2
BreakerNumber 3
Ground Fault Setting:300A PickupNo Time Delay
Zone SelectiveInterlocking Wiring
Ground Fault Setting:600A Pickup0.3 Seconds Time Delay
Ground Fault Setting:1200A Pickup0.5 Seconds Time Delay
Fault 1
There are no interlocking signals. The main breaker trip unit will initiate thetrip instantaneously.
Fault 2
The feeder breaker trip unit will initiate the trip instantaneously to clear thefault; and Zone 2 will send an interlocking signal to the Zone 1 trip unit. TheZone 1 trip unit will begin to time out, and in the event that the feeder breakerin Zone 2 would not clear the fault, the main breaker in Zone 1 will clear thefault in 0.5 seconds.
Fault 3
The branch breaker trip unit will initiate the trip instantaneously to clear thefault; and Zone 3 will send an interlocking signal to the Zone 2 trip unit; andZone 2 will send an interlocking signal to Zone 1.
Zone 1 and Zone 2 trip units will begin to time out, and in the event that thebranch breaker in Zone 3 would not clear the fault, the feeder breaker inZone 2 will clear the fault in 0.3 seconds. Similarly, in the event that the feederbreaker in Zone 2 would not clear the fault, the main breaker in Zone 1 will clearthe fault in 0.5 seconds.
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26.1September 2011
Power Circuit Breakers & Insulated-Case Circuit Breakers
Sheet 26
Magnum DS and SB
Technical Data025
Table 26.1-7. Magnum DS and SB Breaker Control Device Application GuideVdc
Table 26.1-8. Magnum DS and SB Breaker Control Device Application GuideVac
Breaker Control DeviceNominal Voltage
24 Vdc 32 Vdc 48 Vdc 125 Vdc 250 Vdc
Shunt Trip (ST)Operational voltage rangePower consumption (inrush)
Opening time
Trip circuit70110%(required for 35 ms)
Seconds
1726 Vdc250 watts
35 ms
3453 Vdc250 watts
35 ms
77138 Vdc450 watts
35 ms
154275 Vdc450 watts
35 msSpring Release (SR)Operational voltage rangePower consumption (inrush)Closing time
Close circuit70110%(required for 200 ms)Seconds
1726 Vdc250 watts40 ms
3453 Vdc250 watts40 ms
77138 Vdc450 watts40 ms
154275 Vdc450 watts40 ms
Spring Charge Motor (MOT)Operational voltage rangeAmps (running)Amps (inrush)Power consumptionCharging time
85110% voltageRunning% of running
Seconds
2026 Vdc12.0A300%300 watts5 sec
4153 Vdc5.0A500%250 watts5 sec
94138 Vdc2.0A600%250 watts5 sec
187225 Vdc1.0A600%250 watts5 sec
Undervoltage Release (UVR)Operational voltage rangeDrop-out voltage rangePower consumption (inrush)Power consumption (continuous)Opening time
85110% voltage3060% voltageRequired for 200 msRequired for 400 msSeconds
2026 Vdc714 Vdc250 watts18 watts70 ms
2735 Vdc1019 Vdc275 watts15 watts70 ms
4153 Vdc1429 Vdc275 watts18 watts70 ms
94138 Vdc3375 Vdc450 watts10 watts70 ms
187275 Vdc66150 Vdc450 watts10 watts70 ms
Auxiliary Switches
Minimum loadContact rating Inductive load 0.5A
0.5A 0.5A 0.25A
Breaker Control DeviceNominal Voltage
120 Vac 240 Vac 415 Vac 480 Vac 600 Vac
Shunt Trip (ST)Operational voltage rangePower consumption (inrush)Opening time
Trip circuit70110%(Required for 35 ms)Seconds
77140 Vac450 VA35 ms
146264 Vac450 VA35 ms
Spring Release (SR)Operational voltage rangePower consumption (inrush)Closing time
Close circuit70110%(Required for 200 ms)Seconds
77140 Vac450 VA40 ms
146264 Vac450 VA40 ms
Spring Charge Motor (MOT)Operational voltage rangeAmps (running)Amps (inrush)Power consumptionCharging time
85110% voltageRunning% of running
Seconds
93140 Vac2.0A600%250 VA5 sec
177264 Vac1.0A600%250 VA5 sec
Undervoltage Release (UVR)Operational voltage rangeDrop-out voltage rangePower consumption (inrush)Power consumption (continuous)Opening time
85110% voltage3060% voltageRequired for 200 msRequired for 400 msSeconds
94140 Vac3376 Vac450 VA10 VA70 ms
177264 Vac62144 Vac400 VA10 VA70 ms
323457 Vac114249 Vac480 VA10 VA70 ms
408528 Vac144288 Vac400 VA10 VA70 ms
510660 Vac180360 Vac400 VA10 VA70 ms
Auxiliary SwitchesMinimum loadContact rating Inductive load 10A 10A
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For more information, visit: www.eaton.com/consultants CA08104001E
September 2011
Power Circuit Breakers & Insulated-Case Circuit Breakers
Sheet 26
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Magnum DS and SB
Technical Data026
Figure 26.1-9. Typical Magnum Breaker Control Circuit Diagram
Figure 26.1-10. Typical Magnum Secondary Terminal Block Connection Diagram
ControlPower
Close
B12
Leverin DoorSwitch(Draw-out Only)
L.S. b.
a.
a.
OTS 1*
OTS 2*
B15 B26
MDSEOBKR
B10 B24 A7
B13 B14 B27 B11 B25 A8
A1 A2 A3
A4 A5 A6
Open OpenG R
SR
MOT
UVRST
Legend:
LS Limit Switch for Closing Spring
MOT Motor for Spring Charging
ST Shunt Trip
SR Spring Release
UVR Undervoltage ReleaseOTS Overcurrent Trip Switch
Description of Operation:
1 Motor is energized throughLS contact.
2 Motor runs and charges closingspring.
3 When closing spring is fully charged,LS contacts change state.
4 Close contacts energize SR coil.
5 When breaker closes, b opens.
6 LS contacts change state and motorrecharges closing springs.
* Contacts shown for breaker open (not fullycharged), not tripped.
Dotted line denotes Magnum Breaker. Continuous Duty Shunt Trip also available
that eliminates the requirement for thea contact cutout switch.
A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A1 1 A1 2 A 13 A14 A15
ONO OC UVRONOONO OC ONO UVR ALL ALC AL ICL
UVR ATROTS OTS ATR
ATR ATR
INCOM
CLOSEINPUT
A16 A17 A 18 A 19 A2 0 A21 A22 A23 A24 A25 A26 A27 A28 A29 A30
MLS ACN NO NCACP NO NC NO NO NC NC NO NO NC NC
SPRINGCHARGESTATUS
ACCESSARYBUSCOMMUN-ICATIONS
BREAKER AUXILIARY CONTACTS(SHOWN WITH BREAKER IN OPEN POSITION)
B16 B17 B18 B19 B20 B21 B22 B23 B24 B 25 B 26 B2 7 B28 B29 B30
NO NCNO NO NO NONC NCNC NO NC NC LCO LC LNC
BREAKER AUXILIARY CONTACTS(SHOWN WITH BREAKER IN OPEN POSITION)
LATCHCHECKSWITCH
CELL SWITCH CONTACTS(SHOWN WITH BREAKER IN WITHDRAWN POSITION)
C7 C8 C9 C10 C11 C12
CNC CC CNOCNC CC CNO
CELL SWITCH CONTACTS(SHOWN WITH BREAKER IN WITHDRAWN POSITION)
CNC CC CNO CNC CC CNO
C1 C2 C3 C4 C5 C6
INCOM NEG
POWERINPUT
NEUTRAL
SENSORINPUT
SOURCE
GROUNDINPUT
ZONE
INTER-LOCKING
SHUNT
TRIP
SPRING
RELEASE
MOTOR
COM IN OUT
B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 B12 B13 B14 B15
IP IN NPW N2 N1 SGF ZC ZI ZO ST ST SR SR M M
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Power