S&C MetaI-Enclosed SwitchgearSimple, reliable, flexible, and economical . . . the intelligent solution toyour in-plant medium-voltage switching and protection needs.

S&C Metal-Enclosed Switchgear, rated 4.16 kv through34.5 kv, features reliable, time-tested fuses and manualor power-operated interrupter switches in rugged11-gauge steel enclosures. Switchgear bays areconfigured into integrated packages for applicationflexibility, operating simplicity, and superior dependa-bility in switching and protecting medium-voltagepower circuits in commercial, institutional, industrial,and high-rise installations. S&C’s expertise in this fieldhas been established during nearly 50 years of metal-enclosed-switchgear design and manufacture, and iscomplemented by UL® listing of all S&C Metal-EnclosedSwitchgear rated 4.16 kv through 13.8 kv with600-ampere or 1200-ampere main bus.

S&C Metal-Enclosed Switchgear is available in twotypes-modular and custom. S&C System II ModularMetal-Enclosed Switchgear consists of pre-engineeredsingle-bay modules assembled into configurations thatfit most application requirements. Drawing preparationand approval time is minimized, and you gain all theeconomies of repetitive manufacture. For thoserequirements that cannot be fully satisfied withmodules, S&C’s experienced team of specialists willcustom design switchgear for your application.

Power-System-Matched Switchingand ProtectionFull-load switching, plus S&C’s unique one-time andtwo-time duty-cycle fault closing ratings. S&CInterrupter Switches carry and interrupt rated loadcurrents even after being closed into available faultcurrents corresponding to their fault-closing ratings-you can restore power quickly without first having torepair switches inadvertently closed into a fault.One-cycle total clearing with S&C SM and SML PowerFuses – compared to the 5 cycles or more required by

circuit breakers . . . simplifies upstream coordination,minimizes short-circuit stresses on the system.A choice of unique response curves with maintenance-free S&C Electronic Power Fuses – providing protec-tion not available with any other protective devices,even circuit breakers with their relays and batteries.Three-phase protection for three-phase loads. S&Celectronic overcurrent relays provide isolation forthree-phase loads from single phasing and other open-phase conditions.Single-phase protection for single-phase loads.Fuses . . . unlike circuit breakers . . . selectively isolateonly faulted phases of feeders serving single-phaseloads.

Threefold EconomyLow purchase cost – economies inherent in theinterrupter switch and fuse protection concepttranslate into significant first-cost savings.

Low installation cost – metal-enclosed switchgear,light by comparison with breaker gear, is easy to handleand needs no foundation, no support channels . . . onlya level floor or pad. Multibay lineups assemble witha minimum of interbay bolting, and inter-unit busconnections need no taping. Simple field assembly. . .with no relays to set and test. . . means less time,equipment, and manpower for installation. And futureadditions to a lineup are readily accomplished as yoursystem expands.

Low maintenance cost – S&C fuses are nondamageableand do not require any maintenance or calibration toperpetuate the accuracy of their time-current charac-teristics. S&C Interrupter Switches are maintenancefree . . . requiring only an occasional exercising. Andall that’s required with S&C gear is a check of theinsulators and, if necessary, a simple cleaning.

S&C Metal-Enclosed Switchgear With Interrupter SwitchesIndoor and Outdoor Distribution (4.16 kv through 34.5 kv) And Power Fuses

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Matchless Construction Features AssThe top-quality features of S&C’s switchgear bring thesuperior reliability and security needed to assureservice continuity on your medium-voltage distributionsystem. Described below are some of the many built-in reasons for specifying S&C Metal-Enclosed Switch-

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re Long Service Life.gear . . . in both the outdoor style illustrated below andthe indoor style that differs only in a finish suited toindoor requirements and omission of certain weather-proofing features.

A wide choice of S&C components-exhaustively tested, field proven, ofunequaled performance and operational dependability--all expresslydesigned to solve your power distribution problems.

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DESCRIPTIVE BULLETIN 620-35

S&C Metal-Enclosed Switchgear With Interrupter SwitchesIndoor and Outdoor Distribution (4.16 kv through 34.5 kv) And Power Fuses

Simplified Power-System PlanningSimple, reliable, economical-S&C Metal-EnclosedSwitchgear is readily configured into basic circuitarrangements that make power-system planning anddesign easy . . . implementation is logical and straight-forward. The basic arrangements shown below are often

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combined to handle even the most complex distributionsystem need . . . assuring maximum service continuityfor extremely critical loads. Illustrated here are someof the most common arrangements.