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Siemens 3RU7126-4AB0 — Overload Relays

Siemens 3RU7126-4AB0 SIRIUS Thermal Overload Relay, 16 A, Cl

MPN3RU7126-4AB0

Siemens SIRIUS 3RU7126-4AB0 thermal overload relay, S0 size, 16 A rated operational current, Trip Class 10, IP20, screw terminals.

Siemens 3RU7126-4AB0 datasheet (PDF)
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RU7126-4AB0 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationThermal overload relay
Frame size (overload relay)S0
Combinable contactor sizesS0
3RU7126-4AB0 — Protection & Trip
ParameterValue
Overload current setting range11 ... 16 A
Trip classCLASS 10
Overload release typethermal
3RU7126-4AB0 — Electrical (main circuit)
ParameterValue
Rated operational current16 A
Poles (main circuit)3
Rated operating frequency50 ... 60 Hz
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
3RU7126-4AB0 — Auxiliary contacts
ParameterValue
Switching current at 24 V3 A
Switching current at 230 V2 A
3RU7126-4AB0 — 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
Main-circuit connector arrangementTop and bottom
Auxiliary/control circuit connection typescrew-type terminals
Conductor cross-section: solid or stranded2x (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)
3RU7126-4AB0 — Environmental
ParameterValue
Operating temperature-20 ... +55 °C
Transport temperature-25 ... +70 °C
Relative humidity, operating0 ... 90 %
Max. installation altitude2 000 m
3RU7126-4AB0 — Mechanical
ParameterValue
Width45 mm
Height97 mm
Depth96 mm

Product details

It provides motor protection with a Trip Class 10 characteristic. It mounts directly onto a contactor (fastening method: contactor mounting), saving DIN-rail space in the panel. Enclosure protection is IP20 on the front and at the terminals — suitable for installation inside a control cabinet where no washdown or dust ingress is expected.

The relay is designed for 3-pole main circuits and includes thermal overload release (bimetallic). Terminal capacity accepts 2× (0.5 to 1.5 mm²) or 2× (0.75 to 2.5 mm²) solid/stranded wire, or finely stranded with ferrule. Torque for main contacts is 2 to 2.5 N·m; auxiliary contacts are 0.8 to 1.2 N·m.

Frequently asked questions

What are the key ratings for the 3RU7126-4AB0?

Rated operational current is 16 A, Trip Class 10, rated operating voltage 690 V AC/DC, 3 poles. Power loss at rated current is 8.1 W typical. Operating temperature range is -20 to +55 °C.

What is the physical size of the 3RU7126-4AB0?

Width 45 mm, height 97 mm, depth 96 mm. It is the S0 frame size and mounts directly onto a contactor.

MPN
3RU7126-4AB0