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Siemens 3RU1126-1ED0 — Overload Relays

Siemens 3RU1126-1ED0 SIRIUS thermal overload relay, CLASS 10

MPN3RU1126-1ED0

Siemens SIRIUS thermal overload relay, size S0, CLASS 10, screw-type terminals, contactor mounting, IP20 front, ATEX approved, 45 x 97 x 96 mm.

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

Specifications

3RU1126-1ED0 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationthermal overload relay
Frame size (overload relay)S0
Combinable contactor sizesS0
3RU1126-1ED0 — Protection & Trip
ParameterValue
Trip classCLASS 10
3RU1126-1ED0 — Electrical (main circuit)
ParameterValue
Poles (main circuit)3
Rated surge withstand voltage6 kV
Main current circuitscrew-type terminals
3RU1126-1ED0 — Auxiliary contacts
ParameterValue
Auxiliary contacts: NO1
Auxiliary contacts: NC1
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
3RU1126-1ED0 — Connection & Mounting
ParameterValue
Mounting positionwith vertical mounting surface +/-135° rotatable, with vertical mounting surface +/- 45° tiltable to the front and back
Conductor cross-section: solid2x (0.5 ... 2.5 mm²)
Conductor cross-section: finely stranded with ferrule2x (0.5 ... 1.5 mm²)
3RU1126-1ED0 — Environmental
ParameterValue
Operating temperature-20 ... +70 °C
Storage temperature-55 ... +80 °C
Transport temperature-55 ... +80 °C
Relative humidity, operating100 %
Shock resistance8g / 10 ms
3RU1126-1ED0 — Mechanical
ParameterValue
Width45 mm
Height97 mm
Depth96 mm
3RU1126-1ED0 — Specifications
ParameterValue
Type Of ProtectionDMT 98 ATEX G 001

Product details

It mounts directly onto a contactor, saving DIN-rail space and keeping the motor branch compact. Rated for AC-3 switching up to 690 V, with a power dissipation of 5.7 W in hot operating state (1.9 W per pole). The screw-type terminals on the main circuit accept 2x (0.5... 2.5 mm²) solid or 2x (16... 12 AWG) conductors. Front protection is IP20, safe for finger contact inside an enclosure. The relay carries ATEX approval (DMT 98 ATEX G 001) for use in potentially explosive atmospheres — check the wetted materials and area classification before installing in a hazardous zone.

Clearance required: 0 mm upwards, forwards, and backwards; 6 mm at the side. This zero-clearance design lets you pack relays side-by-side without derating for airflow. Shock resistance is 8g for 10 ms.

Frequently asked questions

What is the closest pin-compatible alternative to 3RU1126-1ED0 in this component family?

The 3RU1126-1ED0 is a current-production part with no official replacement. Within the SIRIUS size S0 family, other overload relays differ by trip class, current range, or auxiliary contact count — verify the specific rating before substituting.

MPN
3RU1126-1ED0