TechnicalInformation

High Accuracy, High Technology : The Perfect Choice!ITB 300-S / IT 400-S / IT 700-S Current Transducers

2

0p

Ip

NpNc

0c

currentsourceflux

sensor

High Accuracy, High Technology: The Perfect Choice !ITB 300-S / IT 400-S / IT 700-S Current Transducers.by Stéphane Rollier

Certain Power Electronics applicationsrequire high performance in accuracy,drift or response time that it is necessaryto switch to high technologies to achievethem. The validation of equipment is oftenmade through recognised laboratoriesusing highly accurate and performancetest benches suppor ted by high-tech

subassemblies, including extremelyaccurate current transducers. Thesetransducers are still in need today for suchtraditional applications, but are more andmore requested to be par t of highperformance industrial applications,namely: medical equipment, metering oraccessories for measuring equipment. It

has been a great challenge for LEM toproduce a transducer with highperformance and costs appealing to themarket target, but as a leader in currentmeasurement for more than 30 years, thegoal has been achieved.

To achieve the required accuracyperformance, LEM’s IT currenttransducers do not use Hallgenerators but are based on Fluxgatetechnology, an establishedtechnology LEM has used for manyyears. This is a proven hightechnology at the heart of severalLEM current and voltage transducersfamilies. Today, LEM uses differentversions of Fluxgate technologies,each version providing different levelsof performances and costs matchingto the customer’s requirements. Forthe IT range building, the IT Fluxgatetechnology applied is certainly themost efficient. Thanks to it, we canspeak about accuracy by using ppm(part per million) of the nominal valuewhich is quite representative of theperformances reached.

IT Fluxgate Technology Principle

For accurate measurement of DCcurrents, the methods used since thebeginning of the 20th century consistin compensating the flux (Φp) createdin a core by the Ip current to bemeasured by an opposing flux (Φc)created by an Ic current flowingthrough a known number of turns Nc,to obtain (Figure 1) :

Φp - Φc = 0or Np.Ip – Nc.Ic = 0(Np : Number of pr imary turns)

To obtain an accurate measurement,it is necessary to have a highlyaccurate device to measure preciselythe condition Φ = 0. The aim is touncover a current transducer with thefollowing character istics:

· Excellent linearity,· Outstanding long-term stability,· Low residual noise,· High frequency response,· High reliability.

Fig 1. IT Fluxgate Technology Principle.

3

Fig 2. Hysteresis cycles of the magnetic cores.

Fig 3. Square wave voltage (3a); Currentcreated (3b); Asymmetry of the createdcurrent (3c).

Operation principle

To achieve exceptionalcompensation of the two opposingmagnetic fluxes (Φp - Φc = 0), adetector capable of accuratelymeasuring Φ = 0 must be available,in other words, the detector mustsupply the greatest possible outputsignal for the smallest measured fluxvar iations.

• The hysteresis cycles of themagnetic cores have a formcomparable to the one representedin figure 2 (more or less squareaccording to the type of materialused),• Observing B = f(H) on themagnetization curve, notice that fora given H1 field a ∆B1 var iation

corresponds to ∆H1. But, alsoobserve that later along the cycle, foranother given H2 field, for the samevar iation ∆B2 = ∆B1, the ∆H2variation must be much greater.The detection of the zero flux (Φ = 0)is based on this phenomenon,

Operation Principle

• When a DC current flows throughthe aperture of the core, the path ofthe hysteresis cycle is then shiftedcausing asymmetry of the currentproduced by the square wave voltage

B1

B2

H2

H

H1

H1 H2

B

• When injecting a square wavevoltage (figure 3a) into a winding,wound on a core, until the magneticcircuit starts to become saturated, acurrent (figure 3b) is created; Thiscurrent flowing through a measuringresistor will provide a systematicvoltage relative to zero with peakvalues +Up = -Up,

a)

b)

c)

+ Up

- Up

0

0

0

1/f

poweramplifier

outputamplifier

outputstandardresistor

fluxdetector

y

S

Ip

C

Ic

x

_ +

(figure 3c) and leading to a measuredvoltage at the terminals of the resistorwhere I+UpI >I-UpI. By using peakdetection to measure +Up and -Upand by comparing the two peakvalues, the variations of the flux inthe core are thus detected asnormally Φ = 0 when I+UpI = I-UpI.As soon as the flux varies, an errorvoltage I+UpI - I-UpI is supplied to apower amplifier that drives a currentinto a compensation winding until Φ= 0, thus I+UpI = I-UpI.Figure 4 shows a very simplified basecircuit for the compensation of a DCcurrent.If the primary current Ip = 0, the Iccompensation current will be equalto 0. When Ip varies, the flux varies.Therefore, we detect an error I+UpI -I-UpI which controls the poweramplifier to send out an Iccompensation current until Φ = 0,thus:

Nc x Ic = Np x Ip

The Ic current flows through aresistor, allowing for proportionalvoltage measurement.

Fig 4. Simplified base circuit for DC current compensation.

4

S

S'

C

Ic

Ip

SW

C

S'

I= 0=0

G2

G0

G4

G1

G3

AC Trans

Flux det.

Ic

Ip

Current RegulatorCoil C + Burdenres

Fig 5. Solution against voltage peaks re-injection.

Fig 7. Compensation loop diagram.

Fig 6. The various windings used and theirarrangements.

The accuracy of the measurementwill not only depend on the accuracyof the measur ing resistor but alsovery much on the sensitivity of theflux detector. However, in spite of theDC measurement function accuracy,there are some drawbacks to this DCmeasurement system (Figure 5) :1. As the winding “S” of the fluxdetector is coupled with thecompensation winding “C”, thevoltage peaks, corresponding to thefrequency of the applied square wavevoltage, are re-injected into thecompensation winding and into themeasurement resistor,

2. The system's responsefrequency should be quite low dueto the low scanning voltagefrequency of the flux detector,

3. We recommend only to applypr imary current to the transducerafter powering up the currenttransducer. Failing to do so will resultin oscillation on the output, and adelayed lock-on to the primarycurrent. For IT models, it will fur thermore result in an offset in the orderof ± 50 ppm.

Operation Principle

To compensate for theseinconveniences, the magnetic portionof the transducer is realised asschematically represented in figure6 :

We can see that the winding S forthe flux detection is directly coupledwith the compensation winding C.However, the flux induced by the

square wave voltage, injected intothe S winding, may be practicallycancelled out when a second S’winding is mounted on a separatecore (identical to S) into thecompensation winding C. C will notsee the flux created by the peakssince the flux generated by S’ isopposed to the one created by S(Figures 5 and 6),

A fourth winding W, on a core andalso installed in the compensationwinding C is used to measure thealternating components. It isconnected to a system allowing thepower amplifier to compensate theflux produced by the alternate highfrequency components which are notdetected by the low frequency fluxdetector.

The diagram of the compensationloop is shown in figure 7.

The simplified overall diagram isshown in figure 8 and can be directlydeduced from the diagram, figure 7.The saturation detector is activatedwhen the DC flux detector is not atzero.

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IT 400-S and IT 700-S models, main characteristics

N4

N4

N4

N2

N3

N1

Clock-Generator

Flux-Detector

SaturationDetector

R

ES

RSP

IC

RRL

RRS

R

BurdenResistor

Fig 8. IT and ITB operation principle: simplified overall diagram.

The IT/ITB series transducers offervery high accuracy based onsuperior resolution (better than 0.05ppm for IT 400-S and IT 700-Smodels). This technology providesgalvanic isolation for currentmeasurement of all types ofwaveforms including DC, AC, mixedand complex.

Three models emerged from thistechnology to cover two marketdriven requirements: One issued bythe laborator ies and one by industrialapplications. IT 400-S and IT 700-Smodels are more dedicated for thefirst category and ITB 300-S is ratherfor the second one. All three havebeen designed to operate from abipolar +/-15 VDC power supply.

Parameter Linearity Initial offset Thermal offset Overall accuracyModel of IPN at +25°C drift at +25°C, % of IPN

ITB 300-S 0.001% +/- 0.1 mA 1 µA/K +/- 0.05IT 400-S 3 ppm 30 ppm of IPN 0.5 ppm of IPN /K +/- 0.0033IT 700-S 3 ppm 50 ppm of IPN 0.5 ppm of IPN /K +/- 0.0053

This technology offers many benefits:

IT 400-S and IT 700-S (Picture 1)

Specified for 400 ARMS and 700 ARMS

nominal respectively, they operate ina temperature range from + 10 to +50°C, making them ideal forapplications such as high-precisionpower supplies and high-performance gradient amplifiers forMRI (Magnetic Resonance Imaging)including medical equipment such asmedical X-Ray imaging and alsocalibration test benches inlaboratories and test departments.LEM IT transducers can also be usedas interfaces for power analyzerswhen high accuracy is required.

Thanks to their pr imary aperture,they accommodate round primaryconductors of 26 and 30 mmdiameter respectively.

Picture 1. IT 400-S & IT 700-S models.

In addition to their normal currentoutput, the transducers offer anoutput indicating the transducer state(opened or closed contacts) and anexternal LED showing the normaloperation. This output is provided byan integrated opto-coupler and anintegrated relay for the IT 400-S andthe IT 700-S, respectively.When the two models are operatingnormally (current less than 110% ofthe nominal value), this output isactivated (ON-state) and the contactsare normally closed. When thecurrent goes above 110% of thenominal value (overload situation:fault level), the contacts are opened(OFF-state). Possible currents andvoltages for these special outputs areindicated into the respective datasheets.

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1 ms

ITB 300-Smeasures up to3000 A during 1 ms

Generator3000 A

1 ms Recoverytime to normaloperation state

ITB 300-S(Rm=10Ω)

Generator1000 A

0.8 ms IT 400-S 2000 ApKmeasured during0.8 ms

Generator2000 A

ITB 300-S (Picture 2)

Specif ied for 300 ARMS nominal, itoperates in an extended operatingtemperature range from - 40 to + 85°C,compared to the + 10 to + 50°C of the ITmodels, allowing its use in a wider rangeof applications including high precisionpower supplies, medical equipment,calibration units, precise and high stabilityinverters, power analyzers and metering.The round primary apertureaccommodates primary conductors up to21.5 mm diameter.Similar to the two previous IT models, theITB 300-S offers an additional outputindicating the transducer state. However,the output is an integrated open collectortransistor to be associated with anexternal relay. During normal operation,the output is active or a closed contact.When an operation considered as notnormal occurs (fault level), the output orcontact is opened. For example, thiscould happen during overload conditions(> 3000 A, longer than 10 ms) or whenthe transducer malfunctions.This model at the opposite of IT modelsis suitable for industrial and railwayapplications complying with EN 50178and EN 50155 standards.

Although the ITB uses the sametechnology as the IT current transducers,it is nevertheless proposed at a lowerprice while offering a level ofperformance, just slightly lower than othermembers of the family.

ITB 300-S, main characteristics

Picture 2. ITB 300-S model.

Fig 9. ITB 300-S : 3000 A pK applied with a di/dt=150A/µs-Rm=10Ω.

Fig 10. ITB 300-S : 1000 A pK applied with a di/dt=150A/µs.

Fig 11. IT 400-S : 2000 A pK applied with a di/dt=100A/µs-Rm=10Ω.

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42 ms

Recovery timeto normaloperation state

Generator2000 A

IT 400-S

Generator3500 A

1 ms

IT 700-S3500 ApK measuredduring 1 ms

Generator3500 A

33 ms

Recovery timeto normaloperation state

IT 700-S

Performances in overload conditions

Performance in OverloadConditions

All three models have a highcapability against current overloads:5 times the nominal current for the ITmodels and up to 10 times thenominal current for the ITB 300-Swith a max duration of 100 ms and10 ms, respectively (Figures 9 and10 for ITB 300-S / Figures 11 and 12for IT 400-S / Figures 13 and 14 forIT 700-S).As you can notice it, at 5 x IPN, thanksto the current transformer effect, theIT 400-S and IT 700-S can measurecorrectly the primary overcurrent ifthe duration does not exceed 0.8 msand 1 ms respectively (with a di/dt of100 A/µs) (the specifications giveninto the data sheets can not beguaranteed for this measurement).The products (current x time) areroughly 2000 A.t x 0.8 ms = 1600 and3500 A.t x 1 ms for IT 400-S and IT700-S respectively and beyond thesevalues, the magnetic saturationsoccur.

With ITB 300-S, this is the samething, the transducer can easily followduring a short period of time a currentof 1000 A peak, and, even 3000 Apeak (during 1 ms) with a di/dt of 150A/µs, thanks to its current transformereffect (the specifications given intothe data sheet can not be guaranteedfor these measurements).

Execution of an auto-reset systemoccurs after the overload. A fewseconds are then required to resetthe transducers back to their normaloperation state (please see theprevious figures).The ITB 300-S allows peakmeasurements up to +/- 450 A,conforming to the specifications inthe datasheet.

Fig 13. IT 700-S : 3500 A pK applied with a di/dt=100A/µs-Rm=2.5Ω.

Fig 14. IT 700-S : 3500 A pK applied with a di/dt=100A/µs-Rm=2.5Ω.

Fig 12. IT 400-S :2000 A pK appliedwith a di/dt=100A/µs-Rm=10Ω.

8

0.3% of IPN

1.2 mA error

IT 700-S

Generator 5000V6kV/µs

0.75% of IPN

1.5 mA error

IT 400-S

Generator 1000V6kV/µs

0.14% of IPN

0.2 mA error

ITB 300-S

Generator 5000V6kV/µs

When using the IT models, thesensors are fully operational until 110% of their nominal value and will notbe damaged but, under thesecondit ions (> 100%), thespecifications given into their datasheets can not be guaranteed.

Advice for Installation

To reduce the level of output noise,LEM recommends to make aconnection between pin 4, theelectrostatic shield and the cableshield external to the transducers (IT400-S and IT 700-S).

To avoid disturbances coming fromadjacent external conductors, it isalso advised to locate theseconductors at a certain minimumdistance from the products. For IT400-S and IT 700-S, distances of 75mm and 70 mm respectively, from thecenter of the transducer’s apertures.This has been defined as a minimumdistance before locating adjacentconductors potentially affecting theperformance.All three transducers are equippedwith an electrostatic shield built insidethe case to ensure the best immunityagainst the external electrostaticfields. A shielded output cable andplug are nevertheless advised to beused to ensure maximum immunity.

Common Mode Transient Behavior(dv/dt)

Fast voltage changes duringcommutation of powersemiconductors lead to disturbancesof components within the currenttransducer. These disturbances aredue to the capacitive currentsgenerated between the primaryconductor and the electronic circuitof the transducer and aresuperimposed to the outputtransducer signal.

IT and ITB models can nearly bedefined as being insensitive to dv/dt.Indeed, a voltage change of 5 kV (ITB

Installation advice - Common mode transient behavior

Fig 15. IT 700-S : Behaviour against dv/dt=6 kV/µs, 5000 V applied-Rm=1kΩ.

Fig 16. IT 400-S :Behaviour against dv/dt=6 kV/µs, 5000 Vapplied-Rm=1kΩ.

Fig 17. ITB 300-S :Behaviour against dv/dt=6 kV/µs, 1000 Vapplied-Rm=1kΩ.

9

Generator 400 A

di/dt=100A/µs

IT 400-S

IT 700-S

ITB 300-S

Generator 500 A

di/dt=150A/µs

300-S tested at 1 kV. (ps : The peakvoltage applied doesn’t influence thedisturbance produced) applied witha dv/dt of 6 kV/µs, causes only anerror of 0.3 % of I

PN for the IT 700-S

model (0.75 % for IT 400-S and 0.14% for ITB 300-S) (Figures 15,16 &17).

Excellent Dynamic Performance

IT and ITB models react so quicklyto a current step that it is difficult toestablish exactly their response timesat 90 % of I

PN. For instance, less than

250 ns as response times at 90 % ofIPN

is a fact (Figures 18, 19 & 20).

Dynamic Performances

Fig 18. IT 400-S :Response time @90% of IPN (IP=400A , d i / d t = 1 0 0 A /µs)Rm=10Ω.

Fig 19. IT 700-S : Response time @ 90%of IPN (IP=700 A,di/dt=100A/µs)Rm=2.5Ω.

Fig 20. ITB 300-S : Response time @ 90% ofIP=500 A (di/dt=150A/µs)Rm=10Ω.

Generator 700 A

di/dt=100A/µs

10

C H 1 B / R l o g M A G . 1 d B / R E F - 2 1 . 6 2 d BC H 2 B / R E x P h a s e 1 / R E F 0

0.1

kH

z 0

.2 k

Hz

0.4

kH

z

0.6

kH

z

0.8

kH

z1

kH

z 2

kH

z

4 k

Hz

6 k

Hz

8 k

Hz

10

kH

z 2

0 k

Hz

40

kH

z

60

kH

z

80

kH

z1

00

kH

z

S T A R T 1 0 0 H z S T O P 1 0 0 k H z

0.5

kH

z0

.6 k

Hz

0.8

kH

z1

kH

z

2 k

Hz

4k

Hz

6k

Hz

8k

Hz

10

kH

z

20

kH

z

40

kH

z

60

kH

z

80

kH

z1

00

kH

z

20

0 k

Hz

40

0 k

Hz

50

0 k

Hz

S T A R T 5 0 0 H z S T O P 5 0 0 k H z

Gain: 0.1 dB / div

Phase Shift: 1° / div

0 dB

0°

Gain: 1 dB / div

Phase Shift: 5° / div

0 dB

0°

Dynamic Performances

Fig 21. Frequencyand phase responseof the IT 400-S (10Asinusoidal).

Fig 22. Frequencyand phase responseof the IT 700-S (10Asinusoidal).

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Fig 23. Frequency andphase response of theITB 300-S (300A peaksinusoidal).0

.01

kH

z

0.0

2 k

Hz

0.0

4 k

Hz

0.0

6 k

Hz

0.0

8 k

Hz

0.1

kH

z 0

.2 k

Hz

0.4

kH

z0

.6 k

Hz

0.8

kH

z1

kH

z

2 k

Hz

4 k

Hz

6 k

Hz

8 k

Hz

10

kH

z

20

kH

z

40

kH

z

60

kH

z8

0 k

Hz

10

0 k

Hz

S T A R T 1 0 H z S T O P 1 0 0 k H z

0 dB

0°

Gain: 0.1 dB / div

Phase Shift: 2° / div

This performance contributes amplyto wide bandwidths (Figures 21, 22& 23).

Standards

The transducers are all CE marked,in accordance with the EuropeanEMC Directive 89/336/EEC and thus,satisfy the derived local EMCregulations. They also conform to EN61010-1 for the safety requirements.

Conclusion

Each of these compact modelsallows a dual mounting possibility,horizontal or vertical, making themreally versatile to the variousapplications.

The LEM IT/ITB transducers providean analogue current output burdenedby an external precision resistor, aresistor selected in a way not tocorrupt the transducersperformances.

IT or ITB products can bring therequired solution to industrial, tractionor laboratory applications. Often, therequirements are to get highlyaccurate transducers but lessexpensive and with someperformances less “accurate” but stillof a high level and more adapted tothe industrial world. This is exactlythe “raison d’être” of the ITB 300-Smodel.A two-year warranty is proposed forall these models.

LEM - At the hear t of powerelectronics.

Standards - Conclusion

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ITB 300-S IPN = 300 AIT 400-S IPN = 400 AIT 700-S IPN = 700 A

LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.

4) -3 dB with limited amplitude.5) 10 A sinusoidal, -0.6 dB, 5 Ω as measuring resistor.6) 10 A sinusoidal, -0.5 dB, 2.5 Ω as measuring resistor.

Notes : 1) Transducer may needs a few seconds to comeback to «Normaloperation» state when autoreset system is running.

2) Refer to nominal.3) With a di/dt > 100 A / µs.

High Accuracy and StabilityCurrent Transducers

For the electronic measurement of currents : DC, AC, pulsed...,with a galvanic isolation between the primary circuit (high power)and the secondary circuit (electronic circuit).

Electrical dataPrimary nominal Primary currentr.m.s. current measuring range Type

IPN (A) IP (A) @ ± 15 V300 ± 450 ITB 300-S400 ± 400 IT 400-S700 ± 700 IT 700-S

ITB 300-S IT 400-S IT 700-S

Î P Max overload capability 1) ± 3000/10ms ±2000/100ms ±3500/100ms AR M Measuring resistance RM min 0 TA=+85°C 0 TA=+10..+50°C 0 TA=+10..+50°C Ω

@ VC = ± 15 V RM max 5 IP=±450A 10 IP=±400A 2.5 IP=±700A ΩISN Secondary nominal r.m.s. current 150 200 400 mAK N Conversion ratio 1 : 2000 1 : 2000 1 : 1750VC Supply voltage (± 5 %) ± 15 ± 15 ± 15 VIC Current consumption @ ± 15 V < ± 90 + Is < ± 50 + Is < ± 70 + Is mA

Accuracy - Dynamic performance data

X G Overall accuracy @ IPN , TA = 25°C <± 0.05 <±0.0033 <±0.0053 %εεεεεL Linearity error 2) <0.001 % <3 <3 ppm

Max Max MaxIO Offset current @ IP = 0, TA = 25°C ± 0.1 mA <302) <502) ppmTCIO Offset current drift temperature coefficient <1 µA/K <0.52) <0.52) ppm / Ktr Response time @ 90 % of IPN

3) <1 µs <250 <250 nsdi/dt di/dt accurately followed >100 >100 >100 A / µsf Frequency bandwidth DC .. 100 4) DC .. 100 5) DC .. 100 6) kHz

General data

TA Ambient operating temperature -40 .. +85 +10 .. +50 +10 .. +50 °CTS Ambient storage temperature -45 .. +85 -20 .. +85 -20 .. +85 °CR S Secondary coil resistance 31@ +85°C 51.2 @ +50°C 22.3 @ +50°C Ωm Mass 0.49 0.5 0.8 kg

Standards EN 50178 : 1997EN 50155 : 2001

UL 94 Classification VO VO VO

( ( () ) )

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Isolation characteristics ITB 300-S IT 400-S IT 700-S

Vd R.m.s. voltage for AC isolation test, 50 Hz, 1 mn 5.3 7) 5 7) 5 7) kV1 8) kV 0.2 8) kVDC 0.2 8) kVDC

Vw Impulse withstand voltage 1.2/50 µs 10.8 8 8 kVMin Min Min

Ve R.m.s. voltage for partial discharge extinction @ 10 pC 2.2 9) 1.52 1.51 kVMin Min Min

dCp Creepage distance 12.2 10) 11 9 mmdCl Clearance distance 12.2 10) 11 9 mmCTI Comparative Tracking Index (Group I) 600 600 600 V

Application examplesAccording to EN 50178 and CEI 61010-1 standards and following conditions :

- Overvoltage category OV3- Pollution degree PD2- Heterogeneous field.

EN 50178 IEC 61010-1

dCp, dCI, Rated isolation voltage Nominal voltage

Model ITB 300-S IT 400-S IT 700-S ITB 300-S IT 400-S IT 700-S

Single Isolation 1600 V 1420 V 1140 V 2000 V 2000 V 1600 V

Reinforced isolation 880 V 800 V 660 V 770 V 650 V 500 V

Notes : 7) Between primary and secondary + shield.8) Between secondary and shield.9) Test carried out with a busbar ∅ 19 mm centered in the through-hole.

With a busbar ∅ 21.5 mm (contact between busbar and housing) the minvalue is reduced to 1 kV.

10) See outline drawing.

VW

SafetyThis transducer must be used in electric/electronic equipment withrespect to applicable standards and safety requirements in accordancewith the following manufacturer's operating instructions.

Caution, risk of electrical shock

When operating the transducer, certain parts of the module can carryhazardous voltage (eg. primary busbar, power supply).Ignoring this warning can lead to injury and/or cause serious damage.This transducer is a built-in device, whose conducting parts must beinaccessible after installation.A protective housing or additional shield could be used.Main supply must be able to be disconnected.

Features• Closed loop (compensated) current

transducer using fluxgate technology• D-Sub 9 pole male output interface connector• Output indicates the transducer state• LED shows normal operation (IT 400-S & IT 700-S).

Advantages• Excellent linearity• High accuracy over high bandwidth• Very low output noise• Very low offset drift• Optimized response time• No insertion losses• High immunity to external interference• Current overload capability• Autoreset after overload 1).

Applications• High precision power supplies• Calibration unit• Precise and high stability inverters• Energy measurement• Medical equipment• High performance gradient amplifiers for MRI.

Application domain• Industrial & Traction (ITB 300-S)

LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.

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Dimensions ITB 300-S (in mm. 1 mm = 0.0394 inch)

Status Output ITB 300-S IT 400-S IT 700-S

Max. input Collector current 40 mA - -Max. Collector - Emitter voltage 50 V - -Fault level (off-state) - IP>110 IP>110 %Max. voltage pin 8 to pin 3, off-state - 45 100 VMax. current pin 8 to pin 3, on-state - 0.03 1 AReverse voltage pin 8 to pin 3, off-state - 5 - VOn-voltage pin 8 to pin 3, I = 5 mA - max. 1 - VContact resistance pin 8 to pin 3 - - typ. 50 mΩTest voltage secondary (pin 4) to pin 8 - 300 500 VDC

Mechanical Characteristics ITB 300-S IT 400-S IT 700-S• General tolerance ± 1 ± 0.3 ± 0.3 mm• Transducer fastening

- Flat 1 4 holes ∅ 4.5 mm 4 holes ∅ 5.5 mm4 x M5 steel screws 4 x M4 steel screws 4 x M5 steel screws

Recommended fastening torque 3.4 Nm or 2.5 Lb.-Ft. 2.8 Nm or 2.07 Lb.-Ft. 3.7 Nm or 2.73 Lb.-Ft.- Flat 2 4 x PTKA30 steel screws - -Recommended fastening torque 1 Nm or 0.74 Lb.-Ft. - -

@10 mm penetration - -- Upright 2 holes ∅ 5.5 mm 2 holes ∅ 6.5 mm

2 x M6 steel screws 2 x M5 steel screws 2 x M6 steel screwsRecommended fastening torque 4.5 Nm or 3.3 Lb.-Ft. 3.7 Nm or 2.73 Lb.-Ft. 4.4 Nm or 3.25 Lb.-Ft.

• Primary through hole ∅ < 21.5 ∅ < 26 ∅ < 30 mm• All mounting recommendations are given

for a standard mounting : Screws with flatand spring washers

Front view

Connection

Rear view

Top view

Left view

Normal operation indicator : opencollector, active low (Normal operation)

LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.

15

Dimensions IT 400-S (in mm. 1 mm = 0.0394 inch)

Dimensions IT 700-S (in mm. 1 mm = 0.0394 inch)

Front view

Connection

Top view

Left view

OPTO-ISOLATOR

BC847

10 K

Normal Operation=>ON-State

Electrostaticshield

Closed contacts=> Normal Operation

ElectrostaticShield

Connection

Top view

Left viewFront view

Remarks

• IS is positive when IP flows in the direction of the arrow.• Temperature of the primary conductors should not exceed 100°C (ITB 300-S) / 65°C (IT 400-S & IT 700-S).• Transducer needs to be connected with a shielded secondary cable to comply with EN 50155 standard (ITB 300-S).

LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.

Distributor

Publication CH 25106 E/US (12.05 • 2.5/1.5 • CDH)

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LEM Components8, Chemin des Aulx, CH-1228 Plan-les-OuatesTel. +41/22/7 06 11 11, Fax +41/22/7 94 94 78e-mail: Isa@lem.com; www.lem.com

LEM International Sales RepresentativesAustriaLEM ComponentsAm Concorde Park 2A-2320 SchwechatTel. +43 1 903 60 10 40Fax +43 1 903 60 10 42e-mail: jsc@lem.com

Belarus and Baltic RepublicsDACPOL Co. Ltd.Ul. Pulawska 34PL-05-500 Piaseczno K.WarszawyTel. +48 22 7500868Fax +48 22 7035101e-mail: dacpol@dacpol.com.pl

BeNeLuxLEM Belgium sprl-bvbaRoute de Petit-Roeulx, 95B-7090 Braine-le-ComteTel. : +32 67 55 01 14Fax : +32 67 55 01 15e-mail : lbe@lem.com

CroatiaProteus ElectricVia di Noghere 94/1I-34147 Muggia-AquiliniaTel. +39 040 23 21 88Fax +39 040 23 24 40e-mail:dino.fabiani@proteuselectric.it

Czech RepublicPE & ED Spol. S.R.O.Koblovska 101/23CZ-71100 Ostrava/KoblovTel. +420 59 6239256Fax +420 59 6239531e-mail: peedova@peed.cz

DenmarkMotron A/STorsovej 4DK-8240 RisskovTel. +45 87 36 86 00Fax +45 87 36 86 01e-mail: motron@motron.dk

FinlandEtra-Dielectric OyLampputie 2SF-00741 HelsinkiTel. +358 207 65 160Fax +358 207 65 23 11e-mail: markku.soittila@etra.fi

Field Applications EngineerDominique RoggoTel. +358 40 564 22 91e-mail: dro@lem.com

FranceLEM France SarlLa Ferme de Courtaboeuf19 avenue des IndesF-91969 Courtaboeuf CedexTel. +33 1 69 18 17 50Fax +33 1 69 28 24 29e-mail: lfr@lem.com

GermanyCentral Office:LEM Deutschland GmbHFrankfurter Strasse 74D-64521 Gross-GerauTel. +49 6152 9301 0Fax +49 6152 8 46 61e-mail: postoffice.lde@lem.com

Hauber & Graf Electronics GmbHBavaria / Baden WürttembergWahlwiesenstr. 3D-71711 SteinheimTel: +49 7144 28 15 03/04Fax: +49 7144 28 15 05e-mail: electronics@hauber-graf.de

HungaryOrszaczky Trading LTD.Korányi Sandor U, 28H-1089 BudapestTel. +36 1 314 4225Fax +36 1 324 8757e-mail: orszaczky@axelero.hu

ItalyLEM Italia Srlvia V. Bellini, 7I-35030 Selvazzano Dentro, PDTel. +39 049 805 60 60Fax +39 049 805 60 59e-mail: lit@lem.com

IsraelOfer Levin TechnologicalApplicationPO Box 18247IL- Tel Aviv 611 81Tel.+972 3 5586279Fax +972 3 5586282e-mail: ol_teap@netvision.net.il

NorwayHolst & Fleischer A/SStanseveien 6BN-0975 OsloTel. +47 2333 8500Fax +47 2333 8501e-mail: knut@hf-elektro.no

PolandDACPOL Sp. z o.o.Ul. Pulawska 34PL-05-500 Piaseczno K. WarszawyTel. +48 22 7500868Fax +48 22 7035101e-mail: dacpol@dacpol.com.pl

PortugalQEnergia, LdaPraceta Cesário Verde - 10 S/CaveP-2745-740 MassamáTel. +351 214 309320Fax +351 214 309299e-mail: qenergia@qenergia.pt

RomaniaSYSCOM -18 Srl.Protopopescu 10, bl. 4. ap 2Sector 1R-011728 BucharestTel. +40 21 310 26 78Fax +40 21 310 26 79e-mail: georgeb@syscom.ro

RussiaCentral Office:TVELEMMarshall Budionny Str.11170023 Tver / RussiaTel. +7 822 44 40 53Fax +7 822 44 40 53e-mail: tvelem@lem.com

TVELEMLeningradski Avenue, d. 80Korp. 32, 3d floor, room 19.125190 MoscowTel. +7 095 363 07 67Fax +7 095 363 07 67e-mail: tvelem@lem.com

TVELEMV.O., 2 linia, 19, Liter „A“199053 S. PetersburgTel. +7 812 323 83 83Fax +7 812 323 83 83e-mail: tvelem@lem.com

SloveniaProteus ElectricVia di Noghere 94/1I-34147 Muggia-AquiliniaTel. +39 040 23 21 88Fax +39 040 23 24 40e-mail:dino.fabiani@proteuselectric.it

SpainLEM ComponentsApartado 142E-08500 VICTel. +34 93 886 02 28Fax +34 93 886 60 87e-mail: slu@lem.com

AVANZELCOMPONENTES, S.L.Madrid regionAvda. Sancho Rosa 66E-28708 San Sebastián de los ReyesTel. +34 91 6236828Fax +34 91 6236702e-mail: ventas@avanzel.com

SwedenBeving Elektronik A.B.Jägerhorns väg 8S-14105 HuddingeTel. +46 8 6801199Fax +46 8 6801188e-mail:information@bevingelektronik.se

SwitzerlandSIMPEX Electronic AGBinzackerstrasse 33CH-8622 WetzikonTel. +41 1 931 10 10Fax +41 1 931 10 11e-mail: contact@simpex.ch

LEM SA8, Chemin des AulxCH-1228 Plan-les-OuatesTel. +41 22 706 11 11Fax +41 22 794 94 78e-mail: lsa@lem.com

TurkeyÖzdisan Electronik PazarlamaGalata Kulesi Sokak N° 34TR-80020 Kuledibi / IstanbulTel. +90 212 2499806Fax +90 212 2436946e-mail: oabdi@ozdisan.com

Ukraine"SP DAKPOL" OOOMaksima Berlinskogo str. 4UA-04060, KIEV, UKRAINETel. +380 44 501 93 44Fax +380 44 456 68 58e-mail: kiev@dacpol.com

United Kingdom and EireLEM UK LtdWest Lancs Investment CentreWhitemoss Business ParkSkelmersdale, Lancs WN89TGTel. +44 1 695 71 25 60Fax +44 1 695 71 25 61e-mail: luk@lem.com

BrazilAMDS4 Imp. Exp. e Com. deEquip. Electr. Ltda.Rua Doutor Ulhôa Cintra,489, Centro 13800-061 -Moji Mirim - Sao Paulo -BrazilTel. +55 19 3806 1950 /8509Fax +55 19 3806 8422e-mail: jeduardo@amds4.speedycorp.com.br

CanadaOptimum Components Inc.7750 Birchmount Road Unit 5CAN-Markham ON L3R 0B4Tel. +1 905 477 9393Fax +1 905 477 6197e-mail:mikep@optimumcomponents.com

ChileELECTROCHILEFreire 979 of. 303-304QuilpueTel. +56 32 92 32 22Fax +56 32 92 32 22e-mail: elechile@entchile.net

South AfricaDenver Technical Products Ltd.P.O. Box 75810SA-2047 Garden ViewTel. +27 11 626 20 23Fax +27 11 626 20 09e-mail: denvertech@pixie.co.za

U.S.ACentral Office:LEM U.S.A., Inc.6643 West Mill RoadUSA Milwaukee, Wi 53218Tel. +1 414 353 07 11Toll free: 800 236 53 66Fax +1 414 353 07 33e-mail: lus@lem.com

LEM U.S.A., Inc999, Pennsylvania Ave.USA-Columbus, OH 43201Tel. +1 614 298 84 34Fax +1 614 540 74 36Mobile +1 614 306 73 02e-mail: afg@lem.com

LEM U.S.A., Inc.27 Rt 191APO Box 1207USA-Amherst, NH 03031Tel. +1 603 672 71 57Fax. +1 603 672 71 59e-mail: gap@lem.com

Australia and New ZealandFastron Technologies PtyLtd.25 Kingsley CloseRowville - Melbourne -Victoria 3178Tel. +61 39 763 51 55Fax +61 39 763 51 66e-mail:sales@fastron.com.au

ChinaBeijing LEM Electronics Co.LtdNo. 1 Standard FactoryBuilding B, Airport IndustrialArea, Beijing, ChinaPost code : 101300Tel. +86 10 80 48 31 78Fax +86 10 80 48 43 03e-mail: bjl@lem.com

IndiaGlobetek122/49, 27th Cross7th Block, JayanagarIN-Bangalore-560082Tel. +91 80 2 663 57 76Fax +91 80 2 653 40 20e-mail: globetek@vsnl.com

JapanNANALEM K.K.2-1-2 NakamachiJ-194-0021TokyoTel. +81 42 725 8151Fax +81 42 728 8119e-mail: nle@lem.com

KoreaYoungwoo Ind. Co.C.P.O. Box 10265K-SeoulTel. +82 2 312 66 88 58Fax +82 2 312 66 88 57e-mail: c.k.park@ygwoo.co.kr

MalaysiaAcei Systems SDN BHDNo. 3, SB Jaya 7Taman Industri SB Jaya47000 Sungai BulohSelangor, MalaysiaTel. +60 36157 85 08/55 08Fax +60 3615715 18e-mail: ssbhullar@aceisys.com.my

SingaporeOverseas Trade Center Ltd.03 - 168 Bukit Merah L. 1BLK 125/Alexandra VilRS-150125 SingaporeTel. +65 6 272 60 77Fax +65 6 278 21 34e-mail: octpl@signet.com.sg

TaiwanTope Co., Ltd.3F-4, 716 Chung Cheng RoadChung Ho City, Taipei County,Taiwan 235, R.O.CTel. +886 2 8228 0658Fax +886 2 8228 0659e-mail: tope@ms1.hinet.net

LEM U.S.A., Inc.7985 Vance DriveUSA Arvada, CO 80003Tel. +1 303 403 17 69Fax. +1 303 403 15 89e-mail: dlw@lem.com

POWERTRONICS CO. LTD2F, No 138, Sec. 3Chung-shin Rd, Shing-Tien,Taipei -Hsien 231,Taiwan, R.O.C.Tel. +886 2 2915 7000Fax +886 2 2915 3910e-mail:powertro@ms22.hinet.net