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Siemens 3RU2126-1DJ0 — Overload Relays

Siemens 3RU2126-1DJ0 SIRIUS Thermal Overload Relay, Class 10

MPN3RU2126-1DJ0

Siemens SIRIUS thermal overload relay, 3RU2126-1DJ0, Class 10, S0 size, 690 V rated, contactor mounting, auxiliary switch integrated.

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

3RU2126-1DJ0 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationthermal overload relay
Frame size (overload relay)S0
Combinable contactor sizesS0
Reference code (IEC 81346-2)F
3RU2126-1DJ0 — Protection & Trip
ParameterValue
Overload current setting range2.2 ... 3.2 A
Trip classCLASS 10
Overload release typethermal
3RU2126-1DJ0 — Electrical (main circuit)
ParameterValue
Rated operational current3.2 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)5.7 W
Per pole1.9 W
3RU2126-1DJ0 — 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
3RU2126-1DJ0 — 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
3RU2126-1DJ0 — 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
3RU2126-1DJ0 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth85 mm

Product details

Its Class 10 trip characteristic means it opens within 10 seconds at 7.2× the set current at operating temperature — the standard for standard-start induction motors, not for high-inertia loads that need a slower Class 20 or 30. Rated insulation voltage is 690 V, with power ratings of 1.1 kW at 400 V, 1.5 kW at 500 V, and 2.2 kW at 690 V. The integrated auxiliary switch provides signal feedback across the control voltage range: 2 A at 24 V, 3 A at 120 V, 2 A at 230 V, and 1 A at 400 V. Temperature compensation is active from -40 to +60 °C, and the relay operates across -40 to +70 °C ambient. The S0 footprint and contactor-mounting fastening mean it clips directly onto the matching Siemens contactor — no separate panel space needed, and the ring cable lug connection on the main circuit handles the motor leads.

Mounts directly onto the matching Siemens contactor via the contactor-mounting fastening — no DIN rail or separate bracket required. The S0 size mates with the S0 contactor frame. The integrated auxiliary switch eliminates the need for a separate add-on block for the tripped signal.

The substance prohibitance date of 10/01/2009 aligns with RoHS compliance. MTTF with high demand rate is 2,280 years.

Frequently asked questions

Where can I buy 3RU2126-1DJ0?

Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing confirmed at quote time.

What is the closest functional alternative to 3RU2126-1DJ0?

The 3RU2116-1FC1 is the smaller S00 frame sibling in the same SIRIUS family. The 3RU2126-1DJ0 is the S0 frame version — physically larger, with higher current and power ratings. They are not drop-in interchangeable; the panel cutout and contactor frame differ.

What does the 'for message Tripped' note mean on this relay?

The note indicates the integrated auxiliary switch changes state when the relay trips, providing a signal for a PLC or indicator lamp to annunciate the tripped condition.

Will 3RU2126-1DJ0 drop into a panel specified for 3RU2116-1FC1?

No — the 3RU2126-1DJ0 is S0 frame size (45 mm wide) while the 3RU2116-1FC1 is S00 frame (smaller). The mounting hole pattern and contactor interface differ. Panel layout must accommodate the larger S0 footprint.

MPN
3RU2126-1DJ0