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Siemens 3RU2136-4FB0 SIRIUS Thermal Overload Relay, Class 10

Name: 3RU2136-4FB0
Brand: Siemens
SKU: 3RU2136-4FB0
Availability: LimitedAvailability
Author: Broker Bao

MPN3RU2136-4FB0

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Siemens SIRIUS 3RU2136-4FB0 thermal overload relay, CLASS 10, S2 size, trip-class 10, for contactor mounting, M6 main terminals.

$49.53Ref. price · indicative, final on quote

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Siemens 3RU2136-4FB0 datasheet (PDF)

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

Specifications

3RU2136-4FB0 — Identification
Parameter	Value
Product brand name	SIRIUS
Product designation	thermal overload relay
Frame size (overload relay)	S2
Combinable contactor sizes	S2
Reference code (IEC 81346-2)	F

3RU2136-4FB0 — Protection & Trip
Parameter	Value
Overload current setting range	28 ... 40 A
Trip class	CLASS 10
Overload release type	thermal

3RU2136-4FB0 — Electrical (main circuit)
Parameter	Value
Rated operational current	40 A
Poles (main circuit)	3
Rated operating frequency	50 ... 60 Hz
Rated insulation voltage (AC, pollution degree 3)	690 V
Rated value (AC-3e), max.	690 V
Rated surge withstand voltage	6 kV
Main current circuit	screw-type terminals
Power loss at rated current (hot)	15.6 W
Per pole	5.2 W

3RU2136-4FB0 — Auxiliary contacts
Parameter	Value
Auxiliary contacts: NO	1
Auxiliary contacts: NC	1
Auxiliary contacts: CO (changeover)	0
Auxiliary switch short-circuit protection (required fuse)	fuse gG: 6 A, quick: 10 A
Switching current at 24 V	2 A
Switching current at 60 V	0.3 A
Switching current at 110 V	0.22 A
Switching current at 120 V	3 A
Switching current at 125 V	0.22 A
Switching current at 220 V	0.11 A
Switching current at 230 V	2 A
Switching current at 400 V	1 A

3RU2136-4FB0 — Connection & Mounting
Parameter	Value
Mounting / fastening method	Contactor mounting
Mounting position	any
Main-circuit connector arrangement	Top and bottom
Auxiliary/control circuit connection type	screw-type terminals
Removable aux./control terminal	No
Conductor cross-section: solid or stranded	2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor cross-section: finely stranded with ferrule	2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor range (AWG), main contacts	2x (18 ... 2), 1x (18 ... 1)
Conductor range (AWG), auxiliary contacts	2x (20 ... 16), 2x (18 ... 14)

3RU2136-4FB0 — Environmental
Parameter	Value
Operating temperature	-40 ... +70 °C
Storage temperature	-55 ... +80 °C
Transport temperature	-55 ... +80 °C
Relative humidity, operating	10 ... 95 %
Max. installation altitude	2 000 m

3RU2136-4FB0 — Mechanical
Parameter	Value
Width	55 mm
Height	90 mm
Depth	105 mm

Product details

Sourcing & fit at a glance

The 3RU2136-4FB0: The integrated auxiliary switch provides a 'Tripped' message contact — useful for PLC feedback or panel indication when the overload trips. Temperature compensation is active from -40 °C to +60 °C, and the relay operates at ambient as low as -40 °C.

Mounts in any orientation. Physical envelope: 90 x 55 x 105 mm (H x W x D). Screw terminals accept Pozidriv PZ2 tips, shaft diameter 5–6 mm. For main circuit, M6 bolts; control circuit terminals accept the same wire ranges as listed above. Power dissipation per pole is 5.2 W at rated current. Keep adjacent devices out of the hot air plume if stacking tightly.

Compliance & lifecycle

Lifecycle status is current; RoHS/REACH substance prohibitance date October 15, 2014. Storage and transport -55 to +80 °C; operating -40 to +70 °C.

Frequently asked questions

What does the 'Note for message Tripped' mean?

The relay has an integrated auxiliary switch that signals when the overload has tripped. Its contact closes on trip — typically wired to a PLC digital input or alarm lamp.