BOM / RFQ

3RU1126-1KB0 - Siemens

MPN3RU1126-1KB0

Overload relay 9...12.5 A For motor protection Size S0, Class 10 Contactor mounting Main circuit: screw terminal Auxiliary circuit: screw terminal Manual-Automatic-Reset!!! Phased-out product!!! Successor is SIRIUS 3RU2 Preferred successor type is >>3RU2126-1KB0<<

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

Specifications

3RU1126-1KB0 — Identification
Parameter	Value
Product brand name	SIRIUS
Product designation	thermal overload relay
Frame size (overload relay)	S0
Combinable contactor sizes	S0

3RU1126-1KB0 — Protection & Trip
Parameter	Value
Overload current setting range	9 ... 12.5 A
Trip class	CLASS 10

3RU1126-1KB0 — Electrical (main circuit)
Parameter	Value
Poles (main circuit)	3
Rated insulation voltage (AC, pollution degree 3)	690 V
Rated surge withstand voltage	6 kV
Main current circuit	screw-type terminals
Power loss at rated current (hot)	6.6 W
Per pole	2.2 W

3RU1126-1KB0 — 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 gL/gG: 6 A, quick: 10 A
Switching current at 24 V	1 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

3RU1126-1KB0 — Connection & Mounting
Parameter	Value
Mounting / fastening method	Contactor mounting
Mounting position	with vertical mounting surface +/-135° rotatable, with vertical mounting surface +/- 45° tiltable to the front and back
Auxiliary/control circuit connection type	screw-type terminals
Removable aux./control terminal	No
Conductor cross-section: solid	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 (16 ... 12), 2x (14 ... 8)
Conductor range (AWG), auxiliary contacts	2x (20 ... 16), 2x (18 ... 14)

3RU1126-1KB0 — Environmental
Parameter	Value
Operating temperature	-20 ... +70 °C
Storage temperature	-55 ... +80 °C
Transport temperature	-55 ... +80 °C
Relative humidity, operating	100 %
Max. installation altitude	2 000 m
Shock resistance	8g / 10 ms