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Siemens 3RU1126-1JB0 — Overload Relays

Siemens 3RU1126-1JB0 SIRIUS Thermal Overload Relay, CLASS 10

MPN3RU1126-1JB0

Siemens SIRIUS Size S0 thermal overload relay, 3-pole, CLASS 10, contactor-mount, screw terminals, IP20 front, ATEX certified, 96 mm depth.

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

3RU1126-1JB0 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationthermal overload relay
Frame size (overload relay)S0
Combinable contactor sizesS0
3RU1126-1JB0 — Protection & Trip
ParameterValue
Overload current setting range7 ... 10 A
Trip classCLASS 10
3RU1126-1JB0 — 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)6.6 W
Per pole2.2 W
3RU1126-1JB0 — 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
3RU1126-1JB0 — 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)
3RU1126-1JB0 — 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
3RU1126-1JB0 — Mechanical
ParameterValue
Width45 mm
Height97 mm
Depth96 mm
3RU1126-1JB0 — Specifications
ParameterValue
Type Of ProtectionDMT 98 ATEX G 001

Product details

Integration & Wiring

Main current circuit uses screw-type terminals accepting 2× (0.5…1.5 mm²) and 2× (0.75…2.5 mm²) solid or finely stranded with ferrule, or AWG equivalents 2× (16…12) and 2× (14…8). Auxiliary and control circuit terminals share the same screw-type format and wire ranges. Clearance distances: 0 mm upwards, forwards, backwards, and downwards — so the relay can be stacked directly against adjacent components without extra air gap. Side clearance is 6 mm. Power dissipation per pole is 2.2 W, totaling 6.6 W across three poles at full load — factor that into the panel thermal budget if mounting in a sealed enclosure.

Relative humidity during operation can reach 100 %, making it suitable for unconditioned plant-floor environments. Shock resistance rated at 8g for 10 ms, which covers most industrial vibration profiles from conveyors and compressors. The relay carries ATEX certification (DMT 98 ATEX G 001) for use in potentially explosive atmospheres when paired with an appropriate contactor and enclosure. Substance prohibitance date of 01.07.2006 aligns with RoHS compliance.

Frequently asked questions

What is 3RU1126-1JB0's depth?

The depth is 96 mm, with a width of 45 mm and height of 97 mm — standard S0 frame dimensions that match the corresponding SIRIUS contactor footprint.

What wire sizes does the 3RU1126-1JB0 accept?

Main and auxiliary screw terminals accept 2× (0.5…1.5 mm²) and 2× (0.75…2.5 mm²) solid or finely stranded with ferrule, or AWG equivalents 2× (16…12) and 2× (14…8).

Will 3RU1126-1JB0 drop into a panel wired for 3RU2116-1FC1?

Both are SIRIUS Size S0 thermal overload relays with the same mounting footprint and contactor interface, so physical replacement without rewiring the main circuit is possible. However, the 3RU2116-1FC1 has a different current setting range — verify the motor FLA falls within the 3RU1126-1JB0's adjustment window before swapping.

MPN
3RU1126-1JB0