XXIEC Overload RelaysSIRIUS 3RB12 Solid State Overload Relays

Selection

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Front View 3RB12

1. Control supply voltage terminals A1/A2

2. Green "Ready" LED

3. Red "Ground Fault" LED

4. Red "Overload" LED

5. TEST/RESET button

6. 1 NO/1 NC for overload/thermistor trip

7. Terminals for thermistor T1/T2

8. Terminals for external summation current transformer C1/C2

9. Terminals for remote or auto RESET Y1/Y2

10. Current FLA dial

11. Trip Class dial

12. 1 NO/1 NC for ground fault trip or overload warning option

13. Analog output 4...20 mA

Ordering Information

>• Accessories see page 265.

> Dimensions see page 381.

> Wiring Diagram see page 381.

>• Technical Data see page 358.

> Application Data see page 261.

3RB12 Electronic Overload Relay

3RB1246

Selection and Ordering Data

Rated ControlSupply Voltage

24V DC

110-120V A C ( 1 )

220-240V AC

Setting RangeAmperage

1.25-6.36.3-2525-10050-205125-500200-820

1.25-6.36.3-2525-10050-205125-500200-820

1.25-6.36.3-2525-10050-205125-500200-820

Widthmm

707070

120145230707070

120145230707070120145230

ContactorFitting

single/panel mountsingle/panel mountsingle/panel mount3TF50/51/523TF53/54/55/56/573TF68/69

single/panel mpuntsingle/panel mountsingle/panel mount3TF50/51/523TF53/54/55/56/573TF68/69

single/panel mountsingle/panel mountsingle/panel mount3TF50/51/523TF53/54/55/56/573TF68/69

Catalog No

3RB1246-1PB3RB1246-1QB_3RB1246-1EB_3RB1253-OFB3RB1257-OKB3RB1262-OLB

3RB1246-1PG_3RB1246-1QG3RB1246-1EG3RB1253-OFG_3RB1257-OKG_3RB1262-OLG

3RB1246-1PIVL3RB1246-1QM3RB1246-1EM3RB1253-OFM_3RB1257-OKM3RB1262-OLM

PriceS

372.372.372.558.744.930.

372.372.372.558.744.930.

372.372.372.558.744.930.

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3RB1253

Order Options

VersionWithout internal summation current transformer for low-level ground-fault protection®for motors with 3 and 4-conductor connection (ground-fault protectionin the event of fault currents of U.3A, 0-5A, and 1A) with separate outputfor "ground-fault", next to the "overload/thermistor" output.

3RB1246-1PG

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Without internal summation current transformer for ground-fault protection®for motors with 3 and 4-conductor connection (ground-fault protectionin the event of fault currents of 0.3A, 0-5A and 1A) with separate output for"overload-warning", next to the "overload/thermistor"/"ground-fault" output.

With internal summation current transformer for ground-fault protection® formotors with 3-conductor connection (ground-fault detection in the event offault currents >30% from the set current...) with separate output for"ground-fault", next for the "overload/thermistor" output.

With internal summation current transformer for ground fault protection® for motorswith 3-conductor connection (ground-fault detection in the event of fault currents>30% from the set current...) with separate output for "overload-warning", nextto the "overload/thermistor"/"ground-fault" output.

Function of the outputs in the case of control-voltage failure:(For an explanation, see Table on page 41)

monostablebistable

PriceAdder

None

None

None

None

None155.

©Require external current transformer for low-leground-fault detection. See page 265.

©Can also be used with external transformer. Sepage 265.

©Switching statuses are retained.

Discount Code: Overload RelaysSiemens Industr ial Control Products

^yIEC Overload RelaysSIRIUS 3RB12 Solid State Overload Relays

General

Features• Ground Fault Protection: Equipment

or Low-level.• Overload Warning Contact Option.• Selectable Trip Class: 5, 10, 15, 20,

25, 30.• Three LED Displays: Ready, Ground

Fault, and Overload.• 2 NO/2 NC Electrically Isolated

Auxiliary Contacts are Standard.• Remote and Automatic Reset by

Means of External Wiring.• Combined Test/Reset button with

function test.• Monostable or Bistable Output

Versions Available.•_ Analog output versions available.

Self Monitoring.• UL Listed.• CSA Certified.

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3 R B 1 2 So l i d -S ta te O v e r l o a d R e l a y

ApplicationThe 3RB12 solid state overload fea-tures adjustable trip class, groundfault protection, phase unbalance,and phase loss protection.

An optional overload warning contactprovides status from which to takeaction in advance of a shutdown.These and many other functionswere designed to meet the specificneeds of equipment protection.

Tripping CharacteristicsThe three phase trip curves (Figure 1)show the dependence of the trippingtime from a cold state on the multipleof the current setting. If the unit ispre-loaded with 100% of the current,the tripping times are shortened. Inthe event of a phase loss or a currentunbalance >40% of the current set-ting, the characteristic in phaseloss/unbalance trip curve (Figure 2)applies.

Mode of Operation

The motor current is detected ineach phase via current transformersand continuously monitored by amicroprocessor.

If an overload >110% of the currentsetting occurs, or if there is a current

unbalance >40%, or if a phase lossoccurs, then tripping is initiated bythe switching of two auxiliary con-tacts, 1 NO/1 NC, (Numeral 6 inFront View diagram on page 262).

Resetting is possible after a recoverytime of 5 minutes has elapsed, eitherby pressing the Test/Reset button onthe unit or by remote or automaticreset.

In the event of a ground-fault, theunit trips via separate (1 NO/1 NC)output without a time delay. (Numeral12 in Front View diagram on page262). Resetting after a ground faultis possible without a time delay.

A test of the unit's functions, namelycurrent detection, thermistor andground-fault input, and tripping func-tions of the auxiliary contacts can beinitiated by pressing the TEST/RESETbutton. A test of the unit's functionscan be carried out during operationwithout the contacts changing state.The test is verified by LED signals.

A self-monitoring feature causes theunit to trip when an internal faultoccurs.

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, 6 1 2 5 10x1 e 0,6 1 2 5 10x1 eTripping current (mean values) Tripping current (mean values)

Figure 1 Figure 2

"hree Phase Trip Curves Trip Curves for Phase Loss/Unbalance

Function of the Output RelaysIn Case of:

Dropout of the control voltage without tripReturn of the control voltage without trip

Return of the control voltage after trip

Monostable3RB12...-...0

Unit trips

Unit resets

Bistable3RB12...-...1

No change in the switching state of the auxiliary contacts

Unit remains trippedResetting:

Overload trip, after 5 min.Thermistor trip when 5°K below the operating temperature.Ground-fault trip, immediately.

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Siemens Industrial Control Products