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Siemens 3RU1126-4AB0-ZW97 — Overload Relays

Siemens 3RU1126-4AB0-ZW97 SIRIUS Thermal Overload Relay, S0,

MPN3RU1126-4AB0-ZW97

Siemens SIRIUS 3RU1126-4AB0-ZW97 thermal overload relay, size S0, 3-pole, Class 10 trip, screw-type terminals, IP20 front protection.

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

Specifications

3RU1126-4AB0-ZW97 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationthermal overload relay
Frame size (overload relay)S0
Combinable contactor sizesS0
Reference code (IEC 81346-2)F
3RU1126-4AB0-ZW97 — Protection & Trip
ParameterValue
Overload current setting range11 ... 16 A
Trip classCLASS 10
3RU1126-4AB0-ZW97 — 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
3RU1126-4AB0-ZW97 — 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
3RU1126-4AB0-ZW97 — 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
Removable aux./control terminalNo
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)
3RU1126-4AB0-ZW97 — 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
3RU1126-4AB0-ZW97 — Mechanical
ParameterValue
Width45 mm
Height97 mm
Depth96 mm
3RU1126-4AB0-ZW97 — Specifications
ParameterValue
Type Of ProtectionDMT 98 ATEX G 001

Product details

It mounts directly to a contactor — the fastening method is contactor mounting — and uses a bimetallic strip to model motor heating, tripping the auxiliary contacts when the thermal model exceeds the set point.

Both the main current circuit and the auxiliary/control circuit use screw-type terminals. The main circuit accepts solid conductors 2x (0.5... 1.5 mm²) and 2x (0.75... 2.5 mm²), or AWG 2x (16... 12) and 2x (14... 8). The auxiliary contacts accept 2x (0.5... 1.5 mm²) and 2x (0.75... 2.5 mm²) finely stranded with core end processing, or AWG 2x (20... 16) and 2x (18... 14). The auxiliary contact ratings are given at multiple voltages: 1 A at 24 V, 3 A at 120 V, 2 A at 230 V, and 1 A at 400 V — these are the switching capacities for the built-in N/C and N/O contacts that signal the trip to the control circuit.

Mechanical integration

The power dissipation per pole is 2.7 W — for a 3-pole relay at full load, that is 8.1 W of heat to remove from the enclosure.

Frequently asked questions

What are the key ratings I need to check for fit?

The relay is a SIRIUS S0-size thermal overload relay with Class 10 trip, 3-pole, screw-type terminals, IP20 front protection, and ATEX certification for Zone 1 gas areas. The auxiliary contact ratings vary by voltage: 1 A at 24 V, 3 A at 120 V, 2 A at 230 V, and 1 A at 400 V. Operating temperature range is -20 to +70 °C.

What compliance documentation does this relay carry?

It carries ATEX certification DMT 98 ATEX G 001 for use in Zone 1 gas atmospheres, and RoHS compliance with a substance prohibitance date of 07/01/2006. The reference code per IEC 81346-2 is F.

MPN
3RU1126-4AB0-ZW97