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Siemens 3RU5136-1KB0 — Overload Relays

Siemens 3RU5136-1KB0 SIRIUS Thermal Overload Relay, 9–12.5 A

MPN3RU5136-1KB0

Siemens SIRIUS thermal overload relay, 3RU5136-1KB0, adjustable 9–12.5 A, Trip Class 10, 690 V, 50/60 Hz, screw terminals, contactor mounting for S2 frame.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RU5136-1KB0 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationThermal overload relay
Combinable contactor sizesS2
3RU5136-1KB0 — Protection & Trip
ParameterValue
Overload current setting range9 ... 12.5 A
Trip classCLASS 10
Overload release typethermal
3RU5136-1KB0 — Electrical (main circuit)
ParameterValue
Rated operational current12.5 A
Poles (main circuit)3
Rated operating frequency50 ... 60 Hz
Rated insulation voltage (AC, pollution degree 3)690 V
Rated surge withstand voltage6 kV
Main current circuitscrew-type terminals
Power loss at rated current (hot)7.5 W
Per pole2.5 W
3RU5136-1KB0 — Auxiliary contacts
ParameterValue
Auxiliary switch short-circuit protection (required fuse)fuse gL/gG: 6 A, quick: 10 A
Switching current at 24 V1 A
Switching current at 110 V0.22 A
Switching current at 230 V2 A
3RU5136-1KB0 — Connection & Mounting
ParameterValue
Mounting / fastening methodContactor mounting
Mounting positionwith vertical mounting surface +/-135° rotatable, with vertical mounting surface +/- 45° tiltable to the front and back
Main-circuit connector arrangementTop and bottom
Auxiliary/control circuit connection typescrew-type terminals
Conductor cross-section: solid or stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor cross-section: finely stranded with ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor range (AWG), main contacts2x (18 ... 3), 1x (18 ... 1)
Conductor range (AWG), auxiliary contacts2x (20 ... 16), 2x (18 ... 14)
3RU5136-1KB0 — Environmental
ParameterValue
Operating temperature-20 ... +70 °C
Transport temperature-55 ... +80 °C
Relative humidity, operating0 ... 100 %
Max. installation altitude2 000 m
3RU5136-1KB0 — Mechanical
ParameterValue
Width55 mm
Height105 mm
Depth118 mm

Product details

Adjustable current range is 9 to 12.5 A, Trip Class 10.

Rated operational current is 12.5 A at 690 V, 50/60 Hz. Adjustable overload release covers 9 to 12.5 A. Each pole dissipates 2.5 W, total typical power loss 9 W.

Fastening method is contactor mounting — the relay clips directly onto the contactor's output terminals. Mounting position allows a vertical mounting surface with ±135° rotation and ±45° tilt front-to-back, so you have flexibility in panel layout. Required spacing to grounded parts at the side is 6 mm — keep that gap for heat dissipation and creepage. Main circuit screw terminals accept 2× (0.5 to 1.5 mm²) solid/stranded or 2× (0.75 to 2.5 mm²), with tightening torque 3 to 5 N·m. Auxiliary circuit screw terminals take 2× (20 to 16 AWG). Ambient operating temperature is -20 to +70 °C, storage/transport -55 to +80 °C.

Frequently asked questions

What are the key ratings for the 3RU5136-1KB0?

Adjustable overload range 9 to 12.5 A, Trip Class 10, rated operational current 12.5 A at 690 V, 50/60 Hz. Power loss 9 W total typical. Operating temperature -20 to +70 °C.

How does the 3RU5136-1KB0 mount?

It mounts directly onto an S2-frame contactor — no separate DIN rail for the relay. Main circuit terminals are screw-type, top and bottom, accepting 2× (0.5 to 1.5 mm²) or 2× (0.75 to 2.5 mm²) conductors.

Will the 3RU5136-1KB0 fit a panel designed for a 3RT1036-1AB00 contactor?

The 3RU5136-1KB0 is designed for direct mounting on an S2-frame contactor. The 3RT1036-1AB00 is also an S2-frame contactor, so the relay should mount mechanically without rewiring the main circuit. Verify the contactor's frame size matches S2 before ordering.

MPN
3RU5136-1KB0