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Siemens 3RU2126-1HJ0 — Overload Relays

Siemens 3RU2126-1HJ0 SIRIUS Thermal Overload Relay, CLASS 10

MPN3RU2126-1HJ0

Siemens SIRIUS 3RU2126-1HJ0 thermal overload relay, CLASS 10, S0 frame, 690 V rated, contactor mounting.

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

3RU2126-1HJ0 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationthermal overload relay
Frame size (overload relay)S0
Combinable contactor sizesS0
Reference code (IEC 81346-2)F
3RU2126-1HJ0 — Protection & Trip
ParameterValue
Overload current setting range5.5 ... 8 A
Trip classCLASS 10
Overload release typethermal
3RU2126-1HJ0 — Electrical (main circuit)
ParameterValue
Rated operational current8 A
Poles (main circuit)3
Rated operating frequency50 ... 60 Hz
Rated insulation voltage (AC, pollution degree 3)690 V
Rated value (AC-3e), max.690 V
Rated surge withstand voltage6 kV
Main current circuitRing cable lug connection
Power loss at rated current (hot)6.6 W
Per pole2.2 W
3RU2126-1HJ0 — Auxiliary contacts
ParameterValue
Auxiliary contacts: NO1
Auxiliary contacts: NC1
Auxiliary contacts: CO (changeover)0
Auxiliary switch short-circuit protection (required fuse)fuse gG: 6 A, quick: 10 A
Switching current at 24 V2 A
Switching current at 60 V0.3 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
3RU2126-1HJ0 — Connection & Mounting
ParameterValue
Mounting / fastening methodContactor mounting
Mounting positionany
Main-circuit connector arrangementTop and bottom
Auxiliary/control circuit connection typering terminal lug connection
Removable aux./control terminalNo
3RU2126-1HJ0 — Environmental
ParameterValue
Operating temperature-40 ... +70 °C
Storage temperature-55 ... +80 °C
Transport temperature-55 ... +80 °C
Relative humidity, operating10 ... 95 %
Max. installation altitude2 000 m
3RU2126-1HJ0 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth85 mm

Product details

The thermal bimetallic release is temperature-compensated from -40 to +60 °C, so the trip curve stays consistent whether the panel sits in a cold warehouse or near a hot process line.

The auxiliary contact set includes a normally-closed 'tripped' signal (Note: for message 'Tripped') that gives the PLC a clean status when the relay has operated. Switching capacity is listed across multiple voltages: 2 A at 24 V and 230 V, 3 A at 120 V, 1 A at 400 V, and 0.22 A at 125 V — these cover typical 24 VDC control circuits and 120/230 VAC indication lamps. The S0 frame is physically compact at 45 mm wide, 85 mm deep, and 85 mm tall — fits standard 45 mm DIN-rail spacing with contactor footprint. Terminals accept ring cable lugs on the main circuit (M4 screw) and Pozidriv PZ2 screwdriver tip for the auxiliary connections.

Frequently asked questions

What is the 'Note: for message Tripped' on this relay?

That note refers to the auxiliary contact function — it provides a dedicated normally-closed signal that changes state when the relay trips, used for remote indication to a PLC or annunciator.

MPN
3RU2126-1HJ0