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Siemens 3RU1126-1KD1 — Overload Relays

Siemens 3RU1126-1KD1 SIRIUS thermal overload relay, S0, Clas

MPN3RU1126-1KD1

Siemens SIRIUS thermal overload relay, 3RU1126-1KD1, size S0, Trip Class 10, screw terminals for main circuit, cage clamp for aux.

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

3RU1126-1KD1 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationthermal overload relay
Frame size (overload relay)S0
Combinable contactor sizesS0
Reference code (IEC 81346-2)F
3RU1126-1KD1 — Protection & Trip
ParameterValue
Overload current setting range9 ... 12.5 A
Trip classCLASS 10
3RU1126-1KD1 — 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
3RU1126-1KD1 — 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
3RU1126-1KD1 — Connection & Mounting
ParameterValue
Mounting / fastening methodstand-alone installation
Mounting positionwith vertical mounting surface +/-135° rotatable, with vertical mounting surface +/- 45° tiltable to the front and back
Auxiliary/control circuit connection typeCage Clamp terminals
Removable aux./control terminalNo
Conductor cross-section: solid2x (0.5 ... 2.5 mm²)
Conductor cross-section: finely stranded with ferrule2x (0.5 ... 1.5 mm²)
Conductor range (AWG), main contacts1x (16 ... 12), 1x (14 ... 8)
Conductor range (AWG), auxiliary contacts2x (20 ... 14)
3RU1126-1KD1 — 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
3RU1126-1KD1 — Mechanical
ParameterValue
Width45 mm
Height97 mm
Depth96 mm
3RU1126-1KD1 — Specifications
ParameterValue
Type Of ProtectionDMT 98 ATEX G 001

Product details

Rated for 100 % relative humidity during operation and IP20 on the front, so it lives inside a panel with no special gasketing.

Compliance documentation includes ATEX approval (DMT 98 ATEX G 001) for explosive atmospheres, and substance prohibitance per RoHS as of July 1, 2006.

Mounts standalone or directly onto a SIRIUS contactor. Clearance: 0 mm upwards, forwards, and backwards; 6 mm at the side; 0 mm downwards — so you can pack it tight against the panel wall or adjacent devices, just leave 6 mm on the side for airflow. Dimensions are 97 mm high, 45 mm wide, 96 mm deep — a compact S0 footprint that fits standard DIN-rail enclosures. Shock resistance is 8g for 10 ms, so it holds up in mobile or high-vibration environments like conveyor drives or pump skids.

That's the right choice for standard induction motors that don't need a long start time — a fan or pump that comes up to speed in a few seconds. If your load has a high inertia (like a centrifuge), you'd want a Class 20 or 30, but for most general-purpose motor circuits, Class 10 is the default.

Frequently asked questions

What are the key ratings for this thermal overload relay?

It's a size S0, Trip Class 10 relay with screw terminals for the main circuit and cage clamp for aux/control. Rated for 100 % humidity, IP20 front, 6 kV surge, and ATEX Zone 2/22.

What compliance documentation does the 3RU1126-1KD1 carry?

It has ATEX approval (DMT 98 ATEX G 001), RoHS compliance per the July 1, 2006 substance prohibitance date, and an IEC 81346-2 reference code of F.

What are the mounting clearances for this relay?

Clearances: 0 mm upwards, forwards, and backwards; 6 mm at the side; 0 mm downwards. Mounting position allows ±135° rotation and ±45° tilt on a vertical surface.

MPN
3RU1126-1KD1