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Siemens 3RU1126-4CB0 — Overload Relays

Siemens 3RU1126-4CB0 SIRIUS Thermal Overload Relay, Size S0,

MPN3RU1126-4CB0

Siemens SIRIUS thermal overload relay, Size S0, 3RU1126-4CB0, Trip Class 10, 45 mm width, 96 mm depth, contactor mounting, IP20 front.

$50.41Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RU1126-4CB0 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationthermal overload relay
Frame size (overload relay)S0
Combinable contactor sizesS0
3RU1126-4CB0 — Protection & Trip
ParameterValue
Overload current setting range17 ... 22 A
Trip classCLASS 10
3RU1126-4CB0 — Electrical (main circuit)
ParameterValue
Poles (main circuit)3
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)8.1 W
Per pole2.7 W
3RU1126-4CB0 — Auxiliary contacts
ParameterValue
Auxiliary contacts: NO1
Auxiliary contacts: NC1
Auxiliary contacts: CO (changeover)0
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 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
3RU1126-4CB0 — 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
Auxiliary/control circuit connection typescrew-type terminals
Conductor cross-section: solid2x (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 (16 ... 12), 2x (14 ... 8)
Conductor range (AWG), auxiliary contacts2x (20 ... 16), 2x (18 ... 14)
3RU1126-4CB0 — Environmental
ParameterValue
Operating temperature-20 ... +70 °C
Storage temperature-55 ... +80 °C
Transport temperature-55 ... +80 °C
Relative humidity, operating100 %
Max. installation altitude2 000 m
Shock resistance8g / 10 ms
3RU1126-4CB0 — Mechanical
ParameterValue
Width45 mm
Height97 mm
Depth96 mm
3RU1126-4CB0 — Specifications
ParameterValue
Type Of ProtectionDMT 98 ATEX G 001

Product details

The 6 kV surge voltage rating ensures the relay withstands switching transients on the main circuit without nuisance failure. The 3-pole main circuit covers three-phase motor loads, and the screw-type terminals for both main and auxiliary circuits accept solid conductors from 0.5 to 2.5 mm² — common for panel wiring up to the motor contactor.

Mounts on a vertical surface with ±135° rotation and ±45° tilt — flexible for panel layouts where the contactor is already fixed. Shock resistance of 8g / 10 ms covers normal industrial vibration. The ATEX approval (DMT 98 ATEX G 001,) permits use in potentially explosive gas atmospheres — check the zone classification against your installation.

Frequently asked questions

Who supplies 3RU1126-4CB0 and how is it quoted for volume purchases?

The 3RU1126-4CB0 is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ for volume pricing and lead-time confirmation.

What is 3RU1126-4CB0's listed depth?

The depth is 96 mm. The overall dimensions are 45 mm wide by 97 mm high by 96 mm deep.

What wire sizes does 3RU1126-4CB0 accept for solid conductors?

For the main and auxiliary circuits, the screw terminals accept solid conductors: 2x (0.5... 1.5 mm²) and 2x (0.75... 2.5 mm²).

MPN
3RU1126-4CB0