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Siemens 3RU2136-4RD0 — Overload Relays

Siemens 3RU2136-4RD0 SIRIUS thermal overload relay, Size S2,

MPN3RU2136-4RD0
Active

Siemens SIRIUS 3RU2136-4RD0 Size S2 thermal overload relay, Trip Class 10A, rated 690 V, contactor-mount, screw terminals.

Siemens 3RU2136-4RD0 datasheet (PDF)
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RU2136-4RD0 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationthermal overload relay
Frame size (overload relay)S2
Combinable contactor sizesS2
Reference code (IEC 81346-2)F
3RU2136-4RD0 — Protection & Trip
ParameterValue
Overload current setting range70 ... 80 A
Trip classCLASS 10A
Overload release typethermal
3RU2136-4RD0 — Electrical (main circuit)
ParameterValue
Rated operational current80 A
Poles (main circuit)3
Rated operating frequency50 ... 60 Hz
Rated insulation voltage (AC, pollution degree 3)690 V
Rated value (AC-3e), max.690 V
Rated surge withstand voltage6 kV
Main current circuitscrew-type terminals
Power loss at rated current (hot)18.9 W
Per pole6.3 W
3RU2136-4RD0 — Auxiliary contacts
ParameterValue
Auxiliary contacts: NO1
Auxiliary contacts: NC1
Auxiliary contacts: CO (changeover)0
Auxiliary switch short-circuit protection (required fuse)fuse gG: 6 A, quick: 10 A
Switching current at 24 V2 A
Switching current at 60 V0.3 A
Switching current at 110 V0.22 A
Switching current at 120 V3 A
Switching current at 125 V0.22 A
Switching current at 220 V0.11 A
Switching current at 230 V2 A
Switching current at 400 V1 A
3RU2136-4RD0 — Connection & Mounting
ParameterValue
Mounting / fastening methodContactor mounting
Mounting positionany
Main-circuit connector arrangementTop and bottom
Auxiliary/control circuit connection typespring-loaded terminals
Removable aux./control terminalNo
Conductor cross-section: solid or stranded2x (0.5 ... 2.5 mm²)
Conductor cross-section: finely stranded with ferrule2x (0.5 ... 1.5 mm²)
Conductor range (AWG), main contacts2x (18 ... 2), 1x (18 ... 1)
Conductor range (AWG), auxiliary contacts2x (20 ... 14)
3RU2136-4RD0 — Environmental
ParameterValue
Operating temperature-40 ... +70 °C
Storage temperature-55 ... +80 °C
Transport temperature-55 ... +80 °C
Relative humidity, operating10 ... 95 %
Max. installation altitude2 000 m
3RU2136-4RD0 — Mechanical
ParameterValue
Width55 mm
Height90 mm
Depth105 mm

Product details

SIRIUS Size S2 thermal overload relay, Class 10A

It mounts directly to a contactor and protects motor circuits against overload and phase unbalance. Rated for motor loads up to 37 kW at 400 V and 75 kW at 690 V. The thermal bimetal release compensates for ambient temperature changes between -40 and +60 °C, so the protection stays accurate whether the panel is in a cold warehouse or a warm production floor.

Fastens directly to the contactor — no separate DIN-rail footprint needed. The Size S2 frame mates with the corresponding SIRIUS contactor range. Main circuit connections are screw-type terminals; the auxiliary switch is integrated. Wire capacity is 2 × (0.5 to 2.5 mm²) solid or stranded per clamp. Mounting position is any orientation. The screw terminals accept a Pozidriv PZ 2 bit with a shaft diameter of 5 to 6 mm.

Frequently asked questions

What does the note "for message Tripped" mean?

The note indicates that this relay provides a signal output (typically via the integrated auxiliary switch) when the overload trips. That signal can be wired to a PLC input or a status lamp to indicate a tripped condition on the motor circuit.

Will the 3RU2136-4RD0 drop into a panel designed for the 3RT6023-1BW40 contactor?

The 3RU2136-4RD0 is a Size S2 overload relay designed for contactor mounting. It will physically and electrically mate with the corresponding SIRIUS S2 contactor frame, which is the same frame class as the 3RT6023-1BW40. No rewiring of the main circuit should be needed if the contactor is already an S2 frame.

What compliance documentation is available for this part?

The part carries a substance prohibitance date of 10/15/2014, indicating RoHS compliance per EU Directive 2011/65/EU. It is a Siemens SIRIUS catalog product, typically supplied with a CE declaration and IEC/EN 60947-4-1 compliance documentation. Specific UL/CSA certificates should be requested with the RFQ.

MPN
3RU2136-4RD0