480V Metal-Enclosed SwitchgearSelection and Application Guide

SGSA-3061C (Nov.1998)

Contents

General .......................................................................................................1

Construction Details ................................................................................ 2-4

LV Power Circuit Breakers ...................................................................... 5-9VT, CPT, CT Data ...................................................................................... 10LV Power Circuit Breakers Ratings ..................................................... 11-13Weights and Dimensions ................................................................... 14-15Floor Plans / Side Views ..................................................................... 16-17Guide Form Specifications .................................................................. 18-19

Siemens low-voltage metal-enclosedswitchgear is used in electric power dis-tribution systems for the control and pro-tection of circuits and equipment. Theswitchgear employs drawout type lowvoltage power circuit breakers describedon pages 5-13.

LV switchgear is typically installed in:

J Industrial Plants — for power andlighting networks and feeders, powergeneration and other auxiliaries, and toprovide power for machine tools andmaterial handling equipment drivers.

J Utility and Co-generation Facilities— for motor control centers to protectand distribute power to electricaldevices such as blowers, compres-sors, fans, pumps, and motors.

J Commercial and ResidentialBuildings — for protection and distri-bution of power for lighting, elevators,air conditioning, blowers, fans,motors, and pumps.

Available Types:

J Type R — indoor (NEMA 1)J Type SR — outdoor walk-in (NEMA

3R)Low-voltage switchgear can be appliedon distribution systems with:J 3-phase, 3- or 4-wire feedersJ 50 or 60HzJ Voltages of 208, 240,480, or 600 voltsJ Currents up to 5000 amperesCircuit breakers may be either manuallyor electrically operated, fused or unfused.The following designations are used:J RL — Standard InterruptingJ RLE — Extended InterruptingJ RLI — High InterruptingJ RLF — Fused TypeSiemens Static Trip III trip units are pro-vided on all low voltage power circuitbreakers, except non-automatic circuitbreakers. All circuit breakers are ULListed. See Tables 4.10 and 4.11 for cir-cuit breaker ratings.

Industry Standards

Types R and SR switchgear with powercircuit breakers are designed, tested andconstructed in accordance with:J ANSI C37.20.1 — Metal-Enclosed

Low Voltage Power Circuit BreakerSwitchgear

J ANSI C37.50 — Test Procedure forLow Voltage AC Power CircuitBreakers Used in Enclosures

J ANSI C37.51 — Conformance Testingof Metal-Enclosed Low Voltage ACPower Circuit Breaker SwitchgearAssemblies

J Applicable standards of IEEE andNEMA

J Applicable requirements of theNational Electric Code (NEC)

J UL 1558 — Metal-Enclosed LowVoltage Power Circuit BreakerSwitchgear

Type RL drawout circuit breakers are inaccordance with:J ANSI C37.13 — Low Voltage AC

Power Circuit Breakers Used inEnclosures

J ANSI C37.16 — Preferred Ratings,Related Requirements, andApplication for Low Voltage PowerCircuit Breakers and ACPower CircuitProtectors.

J ANSI C37.17 — Trip Devices for ACand General Purpose DC Low- VoltagePower Circuit Breakers.

J UL 1066 — Low Voltage AC and DCPower Circuit Breakers Used inEnclosures.

Features and modifications required byNEC are incorporated when the assemblyis designated as “Service (Entrance)Equipment.”

UL Listing (Optional)

An Underwriters’ Laboratories listingmark (UL label) can be optionally suppliedfor each vertical section. The specificsection must contain only devices whichare UL Listed or are UL recognized com-ponents found suitable for the intendeduse. All circuit breaker drawout elementsare UL Listed.

General

1

480 Volt Metal-Enclosed Switchgear

480V Metal-Enclosed SwitchgearConstruction Details

2

General

General

The Siemens 480 volt switchgear assem-bly consists of one or more metal-enclosed, vertical sections. Normally theend sections are designed to allow forinstallation of future sections. Each vertical section consists of up tofour individually enclosed breaker or auxil-iary compartments which are sized toprovide uniform height.Included in each assembly are variouscomponents such as circuit breakers,instrumentation and control equipment,transformers, relays, three-phase buswork, and all internal wiring, connectors,and other supporting equipment.In accordance with ANSI C37.20.1, themaximum temperature for parts that arehandled is 50°C. The main bus maximumtemperature rise is 65°C above 40°Cambient. The temperature rise of the airsurrounding the cable connection pointsis limited to 45°C above 40°C ambient.

Finish

During construction, the structural steelparts, panels, and compartments are allprepared for painting by a five-stagewash system. Standard finish color islight gray ANSI 61. If a different finishcolor is required, it is applied over thestandard finish with conventional sprayequipment and is allowed to air cure. Thecompleted finish has a nominal 2 mils dryfilm thickness.

Assembly Construction

Siemens metal-enclosed powerswitchgear is constructed of preformed,full-depth, 14-gauge steel sheets boltedtogether and reinforced with cross-mem-ber braces to form a rigid, self-supportingcompact assembly. The top and rearplates, and side sheets are all 14-gaugesteel. When two vertical sections aremounted together, two sheets of 14-gauge steel separate adjacent circuitbreaker compartments.

Bolted steel / glass polyester compart-ments housing each power circuit break-er are mounted in the vertical section toform the switchgear assembly. This iso-lates the circuit breakers from the bus /cable section and from adjacent circuitbreaker compartments.The bus / cable section includes mainhorizontal bus, riser bus, connectionsfrom the main bus to each set of primarydisconnects, and load side copper run-back bus.Grounded metal barriers can be providedto isolate the main bus from cable con-nections. Barriers are also available toisolate the incoming line to the main cir-cuit breakers from the main load bus ofthe switchgear.

c

b

a

ed

a Inter-Unit Wiring Troughb Meter and Auxiliary Compartmentc Ventilation and Lifting Structured Telescoping Breaker Drawout Railse Ventilation Openings (RL-2000, RL-3200, RL-4000

and RL-5000)

480V Metal-Enclosed SwitchgearConstruction Details

General

3

Main and Ground Bus

The standard main bus is silver-platedcopper. Welded aluminum is also avail-able. Provisions for future extension ofaluminum main bus conductors includetin plated joints with high tensile strengthsteel hardware. Tin-plated copper bus isoptionally available.The main three-phase horizontal bus isarranged vertically one phase above theother with edge-to-edge alignment toprovide high, short circuit strength.Insulated main and vertical bus areoptional.Main bus ratings available are 1600,2000, 3200, 4000, or 5000 amperes con-tinuous current. A neutral bus is fur-nished when specified, and can be rated1600, 2000, 3200, 4000 or 5000 amperescontinuous current.A standard copper ground bus extendsthrough all sections. A cable lug can bemounted to the ground bus in eachsection.Minimum bus bracing is 65,000 amperesRMS symmetrical. Higher symmetricalbracings are available based on the low-est breaker short circuit rating in thegroup.Load side runbacks for feeder circuits areone-piece copper construction, are insu-lated with sleeve tubing in the main busarea, and are supported by high-strength,glass polyester moldings.

Control Wiring

Standard secondary and control wiring is#14 AWG extra-flexible, stranded coppertype SIS. Terminations are made withcompression-type, insulated terminals.For devices not having screw-type termi-nals, tab-type disconnects are used.

Insulation

The insulation used is Pyro-Shield, a fiber-glass-reinforced polyester material thathas high impact strength and low mois-ture absorption. Other features includehigh flame retardance, high resistance tochemical fumes, and long life at hightemperatures.

Circuit Breaker Compartments

Typical circuit breaker compartmentsinclude primary disconnects, ground dis-connect, drawout rails, and associatedinterlocks, and secondary disconnects, ifappropriate. Telescoping drawout railsallow the breaker to be withdrawn fromthe compartment without additionalextensions or adapters. Compartmentsfor electrically-operated circuit breakersinclude secondary disconnects and con-trol circuit fuses. Up to three currenttransformers for metering or relaying canbe mounted in each compartment.Circuit breaker compartment front panelscan be used to hold a variety of auxiliarydevices such as breaker control switch-es, ammeters, and test blocks.

a Control Circuit Fusesb Ground Disconnectc Secondary Disconnectd Front Panel Devicese Primary Disconnect

f TOC Switch Operatorg Interference Interlockh MOC Switch Operatori Space Heaterj Drawout Rails

Circuit Breaker Cell Interior

OptionsSwitchgear Mounted Hoist

The hoist, optional on type R indoorswitchgear, and standard on type SRoutdoor switchgear, travels along rails ontop of the switchgear to ease breakerhandling.

TOC and MOC Switches

The Truck Operated Cell (TOC) Switchprovides interlocking control or remoteindication of the breaker racking position.The cubicle mounted auxiliary switch orMechanism Operated Cell (MOC) switchprovides interlocking control or remoteindication based on the main contactposition (open or closed).The switches have field adjustable con-tacts for simple conversion of contactsfrom normally open (“a” type) to normal-ly closed (“b” type). Each contact may beadjusted individually without disassemblyor removal of wiring.

Shutters

These provide protection against acciden-tal contact with primary disconnects in acompartment when the breaker isremoved.

Wire Trough Covers

Secondary wiring is enclosed within eachvertical section in the primary bus andoutgoing cable areas.

Key Interlock

This provides a mechanical means foroperating circuit breakers and otherdevices only when predescribed condi-tions are met.

PTS4 Test Set

Set allows testing of the full range of pro-tective settings of Static Trip III trip units.

Metering and Auxiliary Compartments

Compartments are available to housedevices such as voltage transformers,metering, control power transformers,and supervisory devices.

Instrument and Control Transformers

Voltage transformers and control powertransformers are mounted in auxiliarycompartments. These transformers areprotected by primary pull-out type cur-rent-limiting fuses and secondary fuses.Current transformers are normally mount-ed on the compartment primary discon-nect studs where they are readily acces-sible. See Tables 4.10, 4.11, 4.12, and4.13 for available ratings.

Outdoor Switchgear

Type SR outdoor switchgear, available upto 5000 amp, is enclosed in a weatherresistant (NEMA 3R) steel housing. Allexterior doors extend below the floor lineand are gasket sealed.For protection from snow, rain, and dust,the switchgear rests on a six-inch,formed steel base which provides rigidsupport and a tight bottom seal. A heavyduty, coal tar emulsion protective under-coating is applied to the underside forprotection against moisture and corro-sion. Shielded ventilation housings permitproper air circulation while excludingdust, dirt, and foreign matter.

A lighted, unobstructed service aisle isprovided at the front of the switchgearallowing inspection and maintenancewithout exposure to the elements, Anaccess door equipped with an emer-gency bar release is located at each endof the aisle. A GFI convenience outlet isincluded.

Accessories

Each switchgear assembly includes thefollowing standard accessories:J Crank for circuit breaker rackingJ Lifting bar assembly for all circuit

breaker typesJ Spring charging handle for electrically

operated circuit breakersAs an optional accessory, a test cabinetis available for indoor use that is wallmounted with necessary equipment fortesting electrically-operated breakers thathave been removed from the breakercompartments.

480V Metal-Enclosed SwitchgearConstruction Details

4

General

Typical Outdoor Installation with Liquid Filled Transformer

MOC and TOC Switches. TOC Shownwith Cover Removed.

Portable PTS4 Test Set

General

5

The Siemens RL series circuit breakersare designed for up to 600 volt servicewith current carrying capacities of up to5000 amperes and interrupting capacitiesof up to 130,000 amperes unfused or200,000 amperes fused.These compact, fast operating circuitbreakers incorporate a stored energyclosing mechanism, either manually orelectrically charged, for fast, positiveclosing.A quick-make closing mechanism releas-es the stored energy for high speed clos-ing of the primary contacts. This positive,controlled closing prevents unnecessaryarcing between the movable and station-ary breaker contacts and thus lengthenscontact and breaker life.Manual tripping is performed with thepush lever on the front of the breaker. Upto three padlocks can be used to lock thebreaker contacts in the open position.

Typical Breaker Features

J Arc QuenchersJ Main and Arcing Contact StructuresJ Inductive Tripping SensorsJ Control WiringJ InterlocksJ Position IndicatorsJ Interpole BarriersJ Mechanical Trip BarJ Auxiliary Switches (option)Each circuit breaker is a complete 3-pole,single-throw element that is mechanicallyand electrically trip-free, with a Static TripIII overcurrent trip unit.Tables 4.16 and 4.17 show circuit breakeroperating and control data.

Circuit Breaker Racking

Racking is accomplished by turning aracking screw on the front of the breakerand may be done with the compartmentdoor open or closed. The racking screwturns U-shaped brackets on each side ofthe breaker which rack the breaker framein or out of the compartment.As the racking screw is turned counter-clockwise, the breaker frame moves outof the compartment and disconnects theprimary contacts, followed by the sec-ondary contacts. With only the secondarycontacts connected (test position), thebreaker may be closed and opened fortesting without energizing the load. Anindicator located on the front of thebreaker identifies the position of thebreaker in the compartment.

Primary Disconnects

Primary current is applied to the circuitbreaker through silver plated disconnects.The stationary contacts are mountedthrough solid Pyro-Shield insulationsheets in the back of the compartments.The movable contacts are mounted onthe back of the breaker. Stainless steelsprings provide pressure to the fingercontacts in the connected position. Lowcontact resistance is maintained by theseself-aligning contacts. The primary con-tacts are positioned so that current canflow only in the connected position. Inthe test position the contacts are separat-ed a safe distance.

Secondary Disconnects

Secondary circuits are connected to thecircuit breaker through silver-plated, slide-type contacts which are located belowthe arc quenching area to avoid contami-nation from arc product gases. The posi-tion of these contacts is visible with thepanel door open. The stationary contactsare silver-plated copper strips mountedon a Pyro-Shield molded base. The con-tacts are recessed to guide the movable,self-aligning contacts and to prevent acci-dental short circuiting. Secondary connec-tions are made automatically in both theconnected and test positions.

480V Metal-Enclosed SwitchgearLV Power Circuit Breakers

Type RL Circuit Breaker With Static Trip III Trip Unit And Optional Breaker Display Unit (BDU)

Secondary Disconnects in CellLeft = CommunicationsRight = Breaker Control

Main and Arcing Contacts — SimilarDesign for all Ratings

480V Metal-Enclosed SwitchgearLV Power Circuit Breakers

6

General

Ground Connection

A ground contact is located on the circuitbreaker to connect with the ground cir-cuit. The breaker is grounded in both theconnected and test positions.

Drawout Interlocks

All circuit breakers have drawout inter-locks to:J prevent racking a closed breakerJ prevent closing breaker until racked to

connected or test positionJ prevent inserting or withdrawing

breaker from compartment while clos-ing springs are charged

Arc Interruption

When a fault occurs, the main contactsopen first, transferring the fault current tothe arcing contacts. As the arcing con-tacts open, the thermal and electromag-netic characteristics force the arc into thearc chute, where the metal plates length-en, constrict, and cool the arc.

Current Limiting Fuses

The 800,1600 and 2000 ampere circuitbreakers are available with integrallymounted current limiting fuses toincrease interrupting rating and / or tolimit short circuit (let-through) current.The fuses are bolted in series with theupper set of primary disconnects. Thebreakers meet all required standards andare UL Listed based on current limitingfuses.An open fuse tripping device is wired inparallel with the main fuses to insure thatthe circuit breaker opens if a main fuseinterrupts, thus preventing single phasing.This device holds the circuit breaker trip-free until it is reset and also indicateswhich main fuse has interrupted.

The higher rated circuit breakers, 3200,4000 and 5000 ampere, are availablewith current limiting fuses mounted on aseparate drawout carriage, which is keyinterlocked with the circuit breaker. Thisallows racking of the fuse carriage onlywith the associated circuit breaker in the

open position. The carriage mounts in thesame vertical section as the circuit break-er element.

Current Sensors

The tripping system of the RL breaker isself-powered from the current sensorsmounted on the primary contacts of thebreaker element (four-wire ground applica-tions include a fourth sensor mounted inthe cable compartment). A signal from thecurrent sensors, proportional to primarycurrent, is applied to the trip device whichthen operates the actuator to trip thebreaker based on a pre-set time delay versus current magnitude relationship.

a Ground shoe contactb Mounting railsc Racking position detentd Stored energy mechanism position

indicatore Contact position indicatorf Arc chutesg Handle for manually charging stored

energy closing springs (optional onelectrically operated breakers)

h Inter-phase barriersi Racking mechanism shutter (with

packlocking provisions)j Racking position indicatork Contact closing release lever

(behind charging handle)

l Clevis attached to racking drivescrew.

m Circuit breaker rating nameplaten Racking interlock baro Static Trip III trip unit test pointsp Static Trip III overcurrent deviceq Tripping lever (with padlocking

provisions) with guard.r Breaker Display Unit (optional)s Power switch for spring charging

motor (electrically operating break-er only)

t Spring charging motor (electricallyoperated breaker only)Auxiliary switch (optional on man-ually operated breakers)

Integrally Fused RLF-800 Circuit Breaker

RL Circuit Breaker Features (Electrically Operated Breaker Shown)

Sensor RatingsFrame Size andMax Amp Rating

800 150, 200, 300,400, 600, 800

1600

2000

150, 200, 300, 400,600, 800, 1200, 1600

150, 200, 300, 400,600, 800, 1200, 1600, 2000

4000

3200 1200, 1600, 2000, 3200 a

1600, 2000,3200 a, 4000 a

5000 5000 a

Table 4.1 Available Sensor Ratings a

a Optionally available with integral 2000A ground sensorwinding to meet NEC 239-95 requirements.

Static Trip® III Trip UnitStatic overcurrent tripping devices havebeen standard on Siemens circuit break-ers for over thirty years. The Static Trip Illtrip unit features microprocessor-con-trolled tripping, while providing RMSsensing for standard overcurrent protec-tion, and optional metering and communi-cations functions. Located in the lowerright side of the breaker, the trip unit isreadily accessible for simple reading andadjustment of all settings and indicators.Static Trip III trip units are interchange-able on all ratings of low voltage circuitbreakers.The time / current characteristics of theStatic Trip III trip unit are shown on page13.

All communicating StaticTrip III trip units includea local communicationport that supports thebreaker-mounted displayunit or BDU. The BDUfeatures a high-visibility

alpha-numeric display. Real-time meteredvalues, min/max values, event log dataand setpoint data can be read on theBDU in straightforward engineering units.Alarm and relay setpoint can be config-ured using the BDU keypad.This data can also be communicated toother devices or computers for controlmonitoring via Siemens’ ACCESS sys-tem. See Section 1 of this guide for athorough description of ACCESS.

General

7

480V Metal-Enclosed SwitchgearLV Power Circuit Breaker Trip Unit

Static Trip® Ill Trip Unit (right) and Breaker Display Unit (left)

Harmonics distort the current wave shapeand can increase its peak value. Normalpeak-sensing units may trip, causing nui-sance shutdowns.

Siemens RMS sensing samples the entirecurrent wave shape and calculates theeffective heating value of the current.Static Trip Ill trip units provide accurateprotection and avoid unnecessary trips.

T: Long Time

S: Short Time

I: Instantaneous

G: Ground Fault

20, 30, 40, 50, 60 .10, .25, .40

Delay(Seconds @ 6X Setting)

Settinga

DelayPickup

(X Sensor Rating)3.5, 6, 1017, 30

.5, .55, .6, .65, .7, .75,

.8, .85, .9, .95, 1.0

(Seconds)

(Seconds)

(X LT Setting)0.8, .15, .22.30, .40

2, 3, 4, 5,6, 7, 8, 12

DelayPickup(X Sensor Rating)

(Seconds)DelayPickup

(% Ground Sensor)

No IntentionalDelay

2, 4, 6, 8,12, 15

Table 4.2 Static Trip III Settings

a Pickup is fixed at 1.1 times long time setting.

8

General

RL BreakerAccessories/Modifications

Type RL circuit breakers feature severaloptions, including:J Shunt Trip, (for MO breakers)J Operation CounterJ Undervoltage Trip DeviceJ Electrically Operated InterlockJ Automatic Trip Alarm Contact (with or

without Lockout Bell Alarm)

Tripping Actuator

The tripping actuator is a low energy,flux-shifting device that allows fast actiontripping of the breaker.

Shunt Trip

The shunt trip is used to electrically tripthe circuit breaker from a remote device,such as pushbutton, switch, or relay. Theshunt trip is standard on all electricallyoperated breakers, optional on manuallyoperated breakers. The shunt trip coil isdesigned for a momentary duty cycle.Thus, an “a” type auxiliary contact switchis used to interrupt the shunt trip circuitimmediately after the breaker is tripped.

When the coil is energized, the armaturepicks up and rotates the trip latch, there-by tripping the breaker. A compressionspring returns the armature to the normalposition.

480V Metal-Enclosed SwitchgearLV Power Circuit Breaker Trip Unit

Function

Model

III

Table 4.3 Static Trip III Trip Unit Functions

Self-Powered Overcurrent ProtectionIIIC IIICP IIICPX

a Requires additional compartment mounted devicesand wiring to meet specific application.

b Supports optional Breaker Display Unit accessory.c Open command uses alarm relay output and restricts

use for other alarm functions. Close commandrequires electrically operated breaker.

d Included when ground fault protection specified.e Requires “N” option and neutral current sensor.f Only displayed for four wire systems.

—

✓ ✓ ✓ ✓RMS Sensing ✓ ✓ ✓ ✓Switchable Thermal Memory ✓ ✓ ✓ ✓Ground Fault Protection opt opt opt opt

opt opt opt opt

LCD Target ✓ ✓ ✓ ✓Protective Microprocessor Watchdog ✓ ✓ ✓ ✓Pickup LEDsZone Interlocking a (For Short Time and Ground Fault)

opt opt opt optRetrofit Universal Mounting Package

opt opt optAlarm Relay Output a

RS-485 Communications Port

✓ ✓ ✓ ✓

✓ ✓ ✓—Breaker Display Unit Port b ✓ ✓ ✓—Communications Microprocessor Watchdog ✓ ✓ ✓—Comm Watch LED ✓ ✓ ✓—Backup Shadow Protection ✓ ✓ ✓——

opt opt opt

opt opt opt

Communication Open/Close/Trip ac —

Trip Log ✓ ✓ ✓

—Trip Unit Status Indication ✓ ✓ ✓—Breaker Position Indication ✓ ✓ ✓—Breaker Operation Counter ✓ ✓ ✓

—Event Log ✓ ✓ ✓—Phase Current Metering ✓ ✓ ✓—Ground Current Metering d ✓ ✓ ✓—Neutral Current Metering e

—Min/Max Current Log ✓ ✓ ✓— —Power Metering Functions ✓

✓✓

— —Min/Max Power Log ✓— — —Extended Protective Relaying ✓— — —Extended Trip Log ✓

Function

Model

Table 4.5Functions

Static Trip III Metering

Phase CurrentsIIIC IIICP

——————

✓ ✓Avg Phase Currents ✓ ✓

✓ ✓Neutral Current e opt optPhase Voltage f ✓Avg Phase Voltage f ✓Line VoltagesAvg Line Voltages

Ground Current d

kW

Power Factor

kW Demand

✓

✓✓✓

—kW Hours ✓—kW Hours Reverse ✓—kVA ✓—kVAR ✓——

kVAR Hours ✓✓

—Frequency ✓

Protective FunctionSettingRange

Typical Applications

Motors

Table 4.4 Static Trip IIICPX Protective Relay Functions

Current Unbalance 5–50%5–50%

60–660V60–660V10–2000kW

50.0–70.0 Hz45.0–60.0 Hz

Generators Mains

—

——

——

——

———

✓ ✓

✓ ✓

Voltage Unbalance ✓ ✓

✓

Overvoltage ✓UndervoltageReverse Power ✓Overfrequency ✓Underfrequency ✓

Shunt Trip(Amperes)Seal-In/Inrush

OperatingVoltageRange

Nominal ControlVoltage

60 HzAC

104–127120 1.65/7.7208–254240 0.71/3.4

DC

28–56 5.4570–140

48125 2.76

140–280250 1.85

Table 4.6 Shunt Trip Coil Ratings

480V Metal-Enclosed SwitchgearLV Power Circuit Breakers

General

9

RL Breaker Accessories /Modifications (cont’d)Operation Counter

A mechanically-operated, 5-digit non-resetable counter can be mountedbeneath the breaker auxiliary switch. The counter is incremented by the action of the auxiliary switch operatingmechanism.

Undervoltage Trip Device

The undervoltage trip device protectsagainst a drop in normal bus voltage andfunctions to directly trip the breaker.Pickup occurs at 85 percent or less ofrated value and dropout between 30 and60 percent of rated value. Pickup anddropout are individually adjustable.Instantaneous or time-delayed operationcan be provided. The static timing unit isadjustable from 0.04 to 4 seconds fortime delay. This allows the system todistinguish between undervoltageconditions and momentary voltage dips.

Electrically Operated Interlock

This can be added to interlock two break-ers, preventing both from being closed atthe same time. These electromechanicaldevices add an additional solenoid thatmust be energized before the breakercan be closed. When the interlock is de-energized, the breaker is held trip-freeand cannot be closed electrically ormanually. The interlock has a mechanicallink that goes to the main shaft of thebreaker. The interlock is held in thepicked-up position when the breaker isclosed. Once closed the interlock can bede-energized without tripping the breaker.There are no adjustments for pickup ordropout voltages. The interlocks arecontinuously energized.

Automatic Trip Alarm Contact (with orwithout Lockout) (Bell Alarm)

The bell alarm contact is operated whenthe trip actuator operates in response tothe Static Trip III trip unit. It indicateswhen the circuit breaker has tripped as aresult of the static trip unit. The contactcan control a local or remote auxiliaryalarm for indication of an automatic tripor, by wiring in series with a breaker clos-ing coil, for interlocking to prevent circuitbreaker closure until the circuit is reset.The contact must be reset manually orelectrically (optional). The manually resetswitch is available with a single-poledouble-throw contact, or two single-polesingle-throw contacts. The electricallyreset switch is available with a single-pole single-throw contact.

If desired, a mechanical lockout optionmay be provided. This substitutes amanual reset for the automatically resettripping actuator. In this case the breakeris held trip free until the lockout ismanually reset.

480V Metal-Enclosed SwitchgearLV Power Circuit Breakers

DropoutVoltage

PickupVoltage

Nominal ControlVoltage

60 Hz AC

100120240 or480a

60

——

DC40 24

10548

125 62

Table 4.7 Undervoltage TripRatings

a Not available. Use 120 VAC undervoltage device withappropriate 240/120V or voltage transformer in cubicle.

BreakMakeContinuous

Bell Alarm Contact Ratings(Amperes)

NominalControlVoltage

60 HzAC

10.0 10.010.010.010.010.0

10.0120240

DC

0.50.5

48125

0.25

10.010.00.50.50.25250

Table 4.9Ratings

Bell Alarm Contact

RL Circuit Breaker – Rear View

1 Current Sensors2 PT Module (Optional)

3 Ground Shoe Contact4 Primary Disconnects

5 Secondary Disconnects

DropoutVoltage

PickupVoltage

Voltage Range

Nominal ControlVoltage

60 Hz AC104208

120240

3672

DC

38 15100

48125 38

200250 75

Table 4.8 Interlock Coil Ratings

10

480V Metal-Enclosed SwitchgearVT, CPT, CT Data

Technical

Ratio

600:120 0.6

480:120 0.6

288:120 0.6

0.6

0.6

0.6

1.2

1.2

1.2

100

100

100

W X Y

Burden

Accuracy Class at 60 Hz

Volt-AmpRating

150

150

150

ThermalRatingVA

50/60

50/60

50/60

Hertz

Table 4.10 Voltage Transformers

Ratio

100:5 1.2

150:5 1.2

200:5 1.2

2.4

2.4

1.2

— —B-0.1 B-0.2 B-0.5

Accuracy at 60 Hz Metering Burden (ohms)

B-1.0

—

— — —

— — —

B-2.0

C5

C5

C10

250:5 0.6 1.2 — — — C10

300:5 0.6 0.6 — — C10

400:5 0.6 0.6 — — C5

500:5 0.6 0.6 — — C10

600:5 0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.6 — C10

800:5 — C15

1000:5 C20

1200:5 C20

1500:5 C30

1600:5 C30

2000:5 C5

2500:5 0.3

0.3

0.3

0.3

0.3

0.3

0.3

1.2

1.2

0.6

0.6

0.3

0.3

0.3

0.3

0.3

0.3

0.6

1.2

0.3

0.3

0.3

0.3

0.6

0.6

0.3

0.6

0.6

0.6

1.2

1.2

0.6

C10

RelayClass

Table 4.12 Current Transformers for RL-800, RLE-800, RLI-800, RL-1600, RLE-1600, RL-2000, or RLE-2000 Applicationsb

kVA Phase

Single

PrimaryVoltage

240/480

SecondaryVoltage

120/240

Table 4.11 Control Power Transformers—115°C Rise

35

1015

a

a

a Requires complete compartment.

b Breaker compartment will accept 3 CT’s in-line on lower disconnects.

Ratio

1000:5

1200:5

1500:5

B-0.1 B-0.2 B-0.5

Accuracy at 60 Hz Metering Burden (ohms)

B-1.0 B-2.0

C20

C25

C35

2000:5 C25

2500:5 C30

3000:5 C15

3200:5 C20

4000:5

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3

C10

5000:5 C10

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3 0.6

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.6

0.6

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3

0.3 0.6

1.2

1.2

RelayClass

Table 4.13 Current Transformers for RL-3200c, RLE-3200c, RL-4000d, RLE-4000d, or RL-5000b Applications

b Breaker compartment will accept 3 CT’s in line on lower disconnects.c Breaker compartment will accept 6 CT’s, 3 on lower and 3 on upper disconnects.d Breaker compartment will accept 3 CT’s in staggered arrangement, 2 on lower and 1 on upper disconnects.

480V Metal-Enclosed SwitchgearLV Power Circuit Breakers

11

480V Metal-Enclosed SwitchgearLV Power Circuit Breakers Ratings

Technical

FrameSizeAmperes

800

1600

2000

RL-800

600 635 2200

BreakerType

RatedVolts

Rated Max.Volts

Voltage Ratings

WithoutInstantaneousTrip Amperes

WithInstantaneousTrip Amperes

Short Circuit RatingSymmetrical CurrentShort Time

RatingSymmetricalAmperes

InsulationLevelDielectricWithstandVolts

30,00030,00030,000

ContinuousCurrentRatingAmperes

75–800RLE-800 42,00065,00042,000 75–800RLI-800 22,00042,00022,000 75–800RL-1600

RLE-1600RL-2000

RLE-2000

3200RL-3200

RLE-3200

4000RL-4000

RLE-4000RL-50005000

50,00065,00050,000 75–160065,00065,00065,000 75–160065,00065,00065,000 75–200085,00085,00085,000 75–200065,00085,00065,000 600–320085,00085,00085,000 600–320085,000100,00085,000 800–4000

100,000100,000100,000 800–400085,000100,00085,000 2500–5000

800

1600

2000

RL-800

480 508 2200

30,00030,00030,000 75–800RLE-800 42,00065,00042,000 75–800RLI-800 22,000100,00022,000 75–800RL-1600

RLE-1600RL-2000

RLE-2000

3200RL-3200

RLE-3200

4000RL-4000

RLE-4000RL-50005000

50,00065,00050,000 75–160065,00065,00065,000 75–160065,00065,00065,000 75–200085,000100,00085,000 75–200065,00085,00065,000 600–320085,00085,00085,000 600–320085,000100,00085,000 800–4000

100,000100,000100,000 800–400085,000100,00085,000 2500–5000

800

1600

2000

RL-800

240and208

254 2200

30,00042,00030,000 75–800RLE-800 42,00065,00042,000 75–800RLI-800 22,000100,00022,000 75–800RL-1600

RLE-1600RL-2000

RLE-2000

3200RL-3200

RLE-3200

4000RL-4000

RLE-4000RL-50005000

50,00065,00050,000 75–160065,00065,00065,000 75–160065,00065,00065,000 75–200085,000100,00085,000 75–200065,00085,00065,000 600–320085,00085,00085,000 600–320085,000130,00085,000 800–4000

100,000130,000100,000 800–400085,000100,00085,000 2500–5000

Table 4.14 Type RL Low-Voltage Power Circuit Breaker Ratings At 50 / 60 Hertz

12

Description

Time from EnergizingShunt Trip Coil Unit (Cycles):

Contacts Part Open

RL-800RLE-800RLI-800RLF-800

RL-1600 & 2000RLE-1600 & 2000RLF-1600 & 2000

RL-4000 & 5000RLE-4000RLF-4000 & 5000

RL-3200RLE-3200RLF-3200

Type

2.0–3.01.0–3.01.25–3.01.5–3.03.0–4.02.2–3.52.2–3.52.2–3.7Contacts Fully Open

Time from EnergizingClosing Control Relay Until (Cycles):

Contacts Touch 2.5 – 5.52.2–5.02.0–5.02.5–5.0

Minimum Voltage 221917152.5 – 5.72.5–5.72.3–5.32.8–5.3Contacts Fully Close

Length of Break,Inches (mm)

Between Main Contacts 1.00 (25 mm)1.00 (25 mm)1.00 (25 mm)1.00 (25 mm)1.10 (28 mm)1.10 (28 mm)1.10 (28 mm)1.10 (28 mm)Between Arcing Contacts

Average SpringCharging Time (Seconds): Nominal Voltage 15131210

10888Maximum Voltage

Table 4.16 Type RL Circuit Breaker Operating Data (60 Hertz Basis)

480V Metal-Enclosed SwitchgearLV Power Circuit Breakers Ratings

Technical

FrameSizeAmperes

800

1600

2000

3200

RLF-800

208to

600600

TypeRatedVolts

Rated Max.Volts

Voltage Ratings

Rangeof FuseRating Amperes

Short CircuitRatingsSymmetrical Amps

InsulationLevel DielectricWithstand Volts

250–1600

ContinuousCurrentRating Amperes

75–800RLF-1600RLF-2000

800–3000

2000–5000

200,0002200

2200

75–16004000 75–2000

600–3200RLF-3200 &RFC-3200Fuse Carriage

200,000

4000–60002200 800–4000200,000RLF-4000 &RFC-4000Fuse Carriage

4000

5000–60002200 2500–5000200,000RLF-5000 &RFC-5000Fuse Carriage

5000

Table 4.15 Type RLF Fused Circuit Breaker Ratings At 50/60 Hertz

Description

Nominal Control Voltage

Spring Charge Motor Voltage Range

Voltage Rating

120 VAC 240 VAC 48 VDC 125 VDC 250 VDC

Table 4.17 Type RL Circuit Breaker Control Data

104–127 100–140 200–280208–254 38–56

Shunt Trip and Closing Coil Voltage Range (at Coil) 104–127 70–140 140–280208–254 28–56Tripping Coil Current (Seal-in / Inrush) — Amperes 1.65/7.7 2.76 1.850.71/3.4 5.45Closing Coil Current (Seal-in / Inrush) — Amperes

Y-Relay Current (Max. Value — Amperes)

1.65/7.7 2.76 1.850.71/3.4 5.45

Current of Spring Charge Motor: Cutoff Value — AmperesInrush Value — Amperes

0.48 0.45 0.210.36 1.16

0.026 0.02 0.010.015 0.15

3.3 3.97 1.921.75 7.5

480V Metal-Enclosed SwitchgearLV Power Circuit Breakers

13

TechnicalTime/Current Characteristics of Static Trip® III Trip Unit

14

Siemens 480 volt switchgear can beconfigured in many ways by combiningdifferent section types. Up to five verticalsections plus a transition section can beshipped together as a unit. If all verticalsections are not to be shipped as a unit,specifications need to be provided thatdescribe the limiting factors (e.g., lowdoor or narrow hallway).Normal indoor vertical sections are 101in. (2565 mm) high and 60 in. (1524 mm)deep. A top-mounted hoist, which isshipped as an accessory in a separatecontainer, adds 2 in. (51 mm) for a totalinstalled height of 103 in. (2616 mm).The outdoor switchgear assemblycontains the indoor assembly in an out-door housing. The overall height is 113in. (2870 mm) and the depth is 119.40 in.(3033 mm).

The major assembly sections include:J Transition Sections — used as transi-

tion to liquid filled transformer or tooutdoor dry type transformers.

J Auxiliary Sections — used as incom-ing bus duct or cable entrance when amain breaker is not used.

J Main Sections — used to containmain breaker and may house meteringand feeder breakers.

J Feeder Sections — used to containfeeder breakers and other equipmentsuch as instrumentation.

J Tie Sections — used to contain tiebreaker and other equipment such asfeeder breakers.

480V Metal-Enclosed SwitchgearWeights and Dimensions

Dimensions

Transition Section For Liquid Filled andOutdoor Dry Type Transformers

RL-800

150 (68)

45 (20)

140 (64)RLE-800

180 (82)

45 (20)

170 (64)RLI-800

185 (84)

45 (20)

175 (80)RL-1600

190 (86)

45 (20)

180 (82)RLE-1600

195 (89)

45 (20)

185 (84)RL-2000

220 (100)

45 (20)

210 (95)RL-3200

300 (136)

50 (23)

290 (132)RL-4000

360 (164)

50 (23)

350 (159)RL-5000

445 (202)

55 (25)

425 (193)RLE-2000

225 (102)

45 (20)

215 (98)RLE-3200

305 (139)

50 (23)

295 (134)RLE-4000

365 (166)

50 (23)

355 (161)Operation

Manual

Electrical

AdditionalWeight forShipping

Element Type

Table 4.19 Breaker Element Weight in lbs. (kg)

RLF-800

205 (93)

45 (20)

195 (89)RLF-1600

320 (145)

45 (20)

310 (141)RLF-2000

335 (152)

45 (20)

325 (148)RLF-3200

330c (150)

50 (23)

290c (132)RFC-3200a

50 (23)

390c

(177)450c

(205)475 (217)c

55 (25)

RLF-4000

360c (100)

45 (20)

350c (95)RLF-5000

445c (202)

55 (25)

425c (193)RFC-4000b

50 (23)

RFC-5000dOperation

Manual

Electrical

AdditionalWeight forShipping

Element Type

Table 4.20 Fused Element Weight in lbs. (kg)

a For use with RLF-3200 breaker.b For use with RLF-4000 breaker.

d For use with RLF-5000 breaker.

c Fuses mounted on separate drawout carriage and locatedin separate compartment. For total weight, add weight ofbreaker element and separate fuse carriage.

550 (250)500 (227)

61 (1549)55 (1397)Outdoor

Indoor

Dimension Ain Inches (mm)

Weightin lbs. (kg)

Table 4.18

15

Tie Breaker Sections and Combinations — Front Views

480V Metal-Enclosed SwitchgearAuxiliary / Breaker Section Dimensions

Dimensions

R30R22

Indoor

Outdoor

1000 (455) 1200 (545)2000 (909) 2400 (1091)

Table 4.21Weight in lbs. (kg)

Auxiliary Section

Auxiliary Sections — Front Views

R30R22

Indoor

Outdoor

1400 (636) 1900 (864)2400 (1091) 3100 (1409)

R36

2210 (1005)—

Table 4.22Connection Weights in lbs. (kg)a

Breaker Section and

aWeights shown do not include weight of circuit breakerremoveable elements. All weights are approximatebased on aluminum bus. For outdoor lineup, add1200 lb (545 kg) to total weight of individual sections forend walls and hoist.

Main Breaker Sections — Front Views

Feeder Breaker Sections and Combinations — Front Views

Breaker Designations

A = RL- 800 / 1600 / 2000,RLF- 800 / 1600 / 2000,RLE- 800 / 2000b, RLI-800b

B = RL- 3200C = RLF- 3200 in one cell, with

fuse drawout (RFC-3200) in other cell

D = RLF- 4000 in one cell, with fuse drawout (RFC-4000) in other cell

E = RL- 4000, RLE-4000F = RLF- 5000 in one cell with

fuse drawout (RFC-5000)in other cell

G = RL- 5000

b 22 in. (559 mm) compartment only.

c Feeder breakers located above tie breaker must be electrically on opposite side of tie breaker fromfeeder breaker which is located below the breaker.

Dimensions in Inches (mm)

16

480V Metal-Enclosed SwitchgearIndoor Floor Plan, Side View

Dimensions

1 This transition required for liquid filled and outdoor dry type transformers only.2 Cable space is 13.2 in. (335 mm) in depth for bottom entry with circuit breaker in bottom compartment. (Refer to side view.)

Switchgear (5000A) Dimensions in Inches (mm)

Bolting Arrangement

Dimensions in Inches (mm)

Switchgear (Up to 4000A)

Indoor Side View

Indoor Floor Plan

17

Outdoor Floor Plan

480V Metal-Enclosed SwitchgearOutdoor Floor Plan, Side View

Dimensions

Dimensions in inches (mm)

Dimensions in inches (mm)

1 Cable space is 22.4 in. (569 mm) depth for bottom entry with circuit breaker in bottom compartment.

Bolting Arrangement

Outdoor Bolting ArrangementType SR

(Side View)

30.0” (762 mm) DoorHinges on Extension

18

This equipment specification guideprovides information for describing atypical metal enclosed low voltage powercircuit breaker switchgear assembly.Items or features that are non-standardbut required for a specific application arepreceded by (option). Items preceded orfollowed by a blank (__) require thatadditional data be provided in order tocomplete the specification.

General

The equipment to be supplied shall bemetal enclosed low-voltage power circuitbreaker switchgear with drawout circuitbreaker elements. All power circuitbreakers and assemblies shall beproduced by a single manufacturer andshall be designed, tested and manufac-tured in accordance with the standardsreferenced in this specification.

Codes and Standards

The switchgear assemblies and power cir-cuit breakers shall comply with the codesand standards as indicated. Copies of cer-tified design tests shall be furnished ifrequested to confirm compliance.J ANSI / IEEE C37.13 — Low-

Voltage AC Power Circuit Breakers Used in Enclosures

J ANSI C37.16 — Low-Voltage PowerCircuit Breakers and AC PowerCircuit Protectors — PreferredRatings, Related Requirements, andApplication Recommendations

J ANSI C37.17 — Trip Devices for ACand General Purpose DC Low-Voltage Power Circuit Breakers

J ANSI / IEEE C37.20.1 — Metal-Enclosed Low-Voltage Power Circuit-Breaker Switchgear

J ANSI / IEEE C37.27 — ApplicationGuide for Low-Voltage ACNonintegrally Fused Power CircuitBreakers (Using Separately MountedCurrent Limiting Fuses)

J ANSI C37.50 — Standard TestProcedures for Low-Voltage ACPower Circuit Breakers Used inEnclosures.

J ANSI C37.51 — StandardConformance Test Procedures forMetal Enclosed Low-Voltage ACPower Circuit-Breaker SwitchgearAssemblies

J ANSI / NEMA 250 — Enclosures forElectrical Equipment (1000 VoltsMaximum)

J NEMA SG 3 — Low-Voltage PowerCircuit Breakers

J NEMA SG 5 — Power SwitchgearAssemblies

J (option) NEMA 210 — SecondaryUnit Substations

J UL 1066 — Low-Voltage AC and DCPower Circuit Breakers Used inEnclosures

J (Option) UL 1558 — Metal-EnclosedLow-Voltage Power Circuit BreakerSwitchgear

Assembly

The switchgear assembly shall be SiemensType R and is to be located indoors, with aNEMA 1 enclosure, (option) outdoor,NEMA 3R per specifications below andconstructed of multiple, metal-enclosed,ventilated sections. The front of each verti-cal section is to contain three or four com-partments with 14 gauge steel side sheetsand compartment barriers of 11 gaugesteel. A double thickness of 14 gauge steelis to be provided between vertical sec-tions. The side sheets shall be full heightand depth to provide a full metal barrierseparating the rear cable compartmentsbetween sections. End sections shallinclude provisions for main bus extensionand installation of future vertical sections.The design shall incorporate preformedsteel channels, angles, and side sheetsbolted together and reinforced to form arigid, self-supporting, compact assembly.Horizontal barriers are to be provided to formindividual circuit breaker or metering com-partments. Circuit breaker compartmentsare to be barriered from the bus compart-ment through a primary disconnect assem-bly. Each circuit breaker or metering com-partment shall be provided with a hingedfront door secured with rotary latches requir-ing no tools to operate.Circuit breaker compartments shall includestationary primary contact disconnects.The primary disconnects shall be copper,silver-plated at connection points and shallbe of one piece construction. The upperset of disconnects shall bolt directly to themain bus and, for feeder circuit breakers,the lower set shall extend to the rear cablearea and shall be insulated where theypass through the main bus compartment.Primary disconnects shall be sized for themaximum continuous current of the circuitbreaker which will be located in the com-partment. Interlocks shall be providedwhich will prevent a circuit breaker ele-ment of the incorrect frame size or inter-rupting rating from being inserted into thecompartment. A stationary circuit breakerframe grounding contact shall be providedwhich shall be visible with the circuitbreaker installed in any position.

Secondary control contacts, whenrequired, shall be located in the circuitbreaker compartment and shall be of thesliding contact, silver-plated copperdesign. Barriers shall be providedbetween terminal points. The secondarycontrol contacts shall engage thedrawout circuit breaker element in theconnected and test positions.Control circuit fuses for electrically oper-ated circuit breakers shall be located onthe side of the circuit breaker compart-ment and shall be contained in a dead-front, pull-out fuse block with a clearcover. Withdrawing the cover from thefuse block shall automatically remove thecontrol circuit fuses and hold them cap-tive. The fuse block cover shall includeprovisions for being installed in thereverse position in order to maintain theopen control circuit for testing or mainte-nance purposes while continuing to holdthe fuses captive. All control wiring within the assemblyshall be continuous and shall terminateon each end at a suitable terminal block.Control wiring shall be 14 gauge, strand-ed, type SIS, and shall be labeled at eachend with sleeve type wire markers. Wiremarkers shall be machine imprinted withthe wire name as indicated on the wiringdiagrams. Wrap on wire markers will notbe accepted. Terminals shall be insulatedlocking fork or ring tongue type exceptwhere connecting to components that donot accept these terminations. Controlwiring for external connections shall beterminated in the rear cable area for easeof access. (Option) Metal covers shall beprovided over control wiring troughswhere they pass through the powercable termination area. (Option) Metalcovers shall be provided over terminalblocks located in the power cable termi-nation area.

Bus

Main bus shall be three-phase, ___ wire___ ampere copper with silver-plated connection joints (option) aluminum withwelded connection points (option) copperwith tin-plated connection points.(Option) Neutral bus rating shall be ___%of the main bus current rating and shallbe located centrally in the structure forease of terminating cables whetherentering from above or below. 600 voltclearances shall be maintained in all hori-zontal and vertical buses such that insula-tion is not required. The main horizontalbus shall be run in a vertical, edge-to-edge arrangement for high short circuitstrength. Access to the rear cable termi-nation area shall be possible without

480V Metal-Enclosed SwitchgearGuide Form Specifications

Specifications

reaching over the main and vertical bus.Bus bracing shall be equal to the shortcircuit interrupting rating of the lowestrated non-fused circuit breaker applied inthe assembly. A 0.25 in. (6 mm) by 2.00 in.(51 mm) copper ground bus will be provid-ed. Barriers shall be provided which isolatethe rear cable termination compartmentfrom the adjacent vertical section. (Option)Barriers shall be provided to isolate therear cable area from the main bus area.(Option) Barriers shall be provided to sepa-rate the incoming line connections fromthe main horizontal and vertical bus.

Circuit Breakers

Circuit breakers shall be Siemens Type RLand shall be either electrically or manuallyoperated as indicated on the data sheets(or drawings). Minimum interrupting rat-ings will be as defined on the data sheets(or drawings) and shall meet or exceed theinterrupting ratings as defined by ANSIstandards. (Option) Fused circuit breakersare to be the integrally fused type throughthe 2000 ampere frame size. 3200 through5000 ampere frame sizes are to be sup-plied with separate drawout fuse carriageswhich are mounted in the same verticalsection as the circuit breaker element andare to be key interlocked with the circuitbreaker element such that the fusecarriage cannot be withdrawn unless thecircuit breaker is locked in the openposition. All fused circuit breakers are to beequipped with blown fuse lockout devicesto prevent single phasing. The applicationof fused circuit breakers shall not reducethe amount of rear cable termination spacewhich would have been provided with non-fused circuit breakers.Circuit breakers are to be 600 volt classwith nominal ratings as dictated by thesystem voltage. Circuit breakers shall bethree-pole, single-throw, operated by astored energy mechanism, with arcquenchers, main and arcing contact struc-ture, a three-phase solid state trip overcur-rent trip unit, trip actuator, three single ratiotripping sensors, and primary disconnect-ing devices. In addition, the circuit breakerelement shall have connected, test, anddisconnected position indicators, springcharged/discharged indicators, and circuitbreaker open or closed indicators all ofwhich shall be visible to the operator withthe compartment door closed. It shall bepossible to rack the circuit breaker elementfrom the disconnect to the connected posi-tion with the compartment door closed.Interlocks will be provided that preventracking a circuit breaker unless the circuitbreaker is open and that prevent closing acircuit breaker unless it is in the connectedor test position.

Solid State Trip Units

Solid state trip units shall be SiemensJ Static Trip III (basic device)J (Option) Static Trip IIIC (adds

communications capability)J (Option) Static Trip IIICP (adds

communications and power metering)J (Option) Static Trip IIICPX (adds

communications, power metering, and relaying functions)

Trip units shall be interchangeable so thatany trip unit can be used with any framesize circuit breaker. The basic trip unit shallbe a self powered, micro-processor baseddevice that measures true RMS currents.Long time, short circuit or ground fault tripindication shall be maintained for a mini-mum of 48 hours without the need for aseparate battery or relay. Peak sensingdevices will not be accepted. All adjust-ment setting switches shall be digitallyencoded type with gold contacts. (Note:Refer to catalog section SGBR-3169B forspecifications on the Siemens Static Trip IIItrip unit family and all associated options).

Instrumentation and Metering

A wide variety of user defined meteringand instrumentation options are available.They include Siemens 4720, 4700 & 4300power meters, Siemens Static Trip III tripunits, and traditional analog devices. Formore detailed specification information onSiemens devices refer to bulletins SGFL3181B, 3161A, and 3151B for 4720, 4700,and 4300 power meters, respectively; andSGBR-3169B Static Trip III Micro-processorBased Tripping System. If one of theoptions selected requires separate voltageand current transformers, such as theSiemens 4700 power meter, the followingmay be used to define these devices. Current transformers shall have standardaccuracy class ratings as defined by ANSIC37.20.1 and shall be mounted directly onthe stationary primary disconnects in thecircuit breaker compartment. Voltage trans-formers shall have a minimum 150VAthermal rating and shall be located in ametal enclosed metering compartmentand shall be protected on the primary sidewith current limiting fuses.

Outdoor

(Option) Outdoor, NEMA 3R, walk-in,weatherproof construction is to be provided.The complete assembly is to rest on aformed steel base provided under eachvertical section and running perpendicularto the depth of the switchgear. The under-side of the enclosure and base structure isto be undercoated with coal tar emulsionmaterial.

Front and rear doors are to be gasketedand hinged. Front doors, located at eachend, are to include panic release door hard-ware, three point latches, and provision forpadlocking. Rear doors shall be bolted. Allexterior hardware shall be stainless steel.An indoor access aisle approximately 42 in.(1067 mm) deep and accessible fromeither door is to be provided at the front ofthe switchgear line-up for inspection andtesting of the circuit breakers and associat-ed equipment. A hand-operated travelinghoist, mounted above the switchgear is tobe provided for changeout of circuit break-ers. The aisle is to have an extension oneach end to accommodate end unit doorsthat have instrumentation and metering,and to provide additional space for circuitbreaker handling.The switchgear is to include space heatersto prevent condensation of moisture. Theaisle shall be provided with incandescentlights, convenience receptacle, and an ON/ OFF switch at each end to control thelights.

Finish

During construction, the structural steelparts, panels, and compartments shall beprepared for painting by a five-stage washsystem consisting of an alkaline cleaner,fresh water rinse, iron phosphate treat-ment, fresh water rinse, and non-chromatesealer. After cleaning and stabilization, thesteel parts shall be coated with a ther-mosetting polyester powder applied withelectrostatic equipment at a nominal 2 milsdry film thickness and then cured at 425degrees Fahrenheit for 20 minutes. Paintcolor shall be ANSI 61 light gray. The paintfinish shall have a pencil hardness of 2H, agloss as defined by ANSI D523-78 of 45-55%, a salt spray rating per ASTM B-117-73 of 600 hours, and shall be outdoor ratedper UL1332.

Accessories

The following accessories are to beprovided:J crank for racking circuit breakersJ lifting yoke for circuit breakersJ container of touch-up paintJ (optional) portable test set, type PTS4J overhead hoist for indoor switchgearJ (optional) test cabinet

Testing

Production tests in accordance with ANSIC37.20.1, ANSI C37.50, ANSI C37.51 andNEMA SG 5 shall be performed on thecompleted assembly. Certified copies ofthese tests shall be furnished uponrequest.

19

480V Metal-Enclosed SwitchgearGuide Form Specifications

Specifications

Siemens Energy & Automation, Inc.P.O. Box 29503Raleigh, NC 27626-0503©1998 Siemens Energy & Automation. All rights reserved. 5M 11/98 TDSIEMENS is a registered trademark of Siemens AG.ACCESS and Static Trip III are trademarks of Siemens Energy & Automation, Inc.

Printed in U.S.A.