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Siemens 3RU1146-4ED0 — Overload Relays

Siemens 3RU1146-4ED0 SIRIUS thermal overload relay, S3, Trip

MPN3RU1146-4ED0

Siemens SIRIUS 3RU1146-4ED0, S3 thermal overload relay, Trip Class 10, IP20 front, screw-type main terminals, contactor-mount, ATEX certified.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RU1146-4ED0 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationthermal overload relay
Frame size (overload relay)S3
Combinable contactor sizesS3
Reference code (IEC 81346-2)F
3RU1146-4ED0 — Protection & Trip
ParameterValue
Overload current setting range22 ... 32 A
Trip classCLASS 10
3RU1146-4ED0 — Electrical (main circuit)
ParameterValue
Poles (main circuit)3
Rated insulation voltage (AC, pollution degree 3)1 000 V
Rated surge withstand voltage8 kV
Main current circuitscrew-type terminals
Power loss at rated current (hot)13.5 W
Per pole4.5 W
3RU1146-4ED0 — 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
3RU1146-4ED0 — 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 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 contacts2x (10 ... 1/0), 1x (10 ... 2/0)
Conductor range (AWG), auxiliary contacts2x (20 ... 14)
3RU1146-4ED0 — 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
3RU1146-4ED0 — Mechanical
ParameterValue
Width70 mm
Height120 mm
Depth140 mm
3RU1146-4ED0 — Specifications
ParameterValue
Type Of ProtectionDMT 98 ATEX G 001

Product details

SIRIUS S3 thermal overload relay

The Siemens 3RU1146-4ED0 is a SIRIUS S3 thermal overload relay designed to protect motors against overload and phase failure.

The S3 frame size handles larger motor loads; the screw-type main terminals accept 2x (10 … 50 mm²) stranded or 10 … 70 mm² single conductor, so it's built for the power side of a motor branch circuit. Auxiliary and control circuits use Cage Clamp terminals (2x 0.5 … 2.5 mm² solid), which speed up wiring in the panel — no screwdriver torque check needed. The front face is IP20, so it's touch-safe for the panel interior but not for washdown environments.

This relay is designed for contactor mounting — it snaps onto the bottom of a matching SIRIUS contactor, eliminating separate panel wiring for the motor circuit. Mounting position allows vertical surface with ±135° rotation and ±45° tilt front/back, so it adapts to tight enclosure layouts. The depth is 140 mm, width 70 mm, height 120 mm — account for that when laying out the DIN rail and door clearance.

Frequently asked questions

What compliance documentation does this relay carry?

It holds ATEX certification (DMT 98 ATEX G 001) and RoHS substance prohibition dated 07/01/2006. The front IP20 protection is rated. No UL or CSA listing appears in the spec record.

What are the key ratings I need to check for fit?

Trip Class 10, S3 frame size, screw-type main terminals (2x 10…50 mm² stranded), Cage Clamp aux terminals (2x 0.5…2.5 mm² solid), IP20 front, ATEX certified, operating temperature -20 to +70 °C, dimensions 140×70×120 mm (D×W×H).

Will the 3RU1146-4ED0 drop into a panel specified around a Siemens S7 PLC without rewiring?

The 3RU1146-4ED0 is a thermal overload relay for the motor branch circuit, not a PLC module. It connects to the contactor and motor, not to the PLC backplane. The PLC (e.g., 6ES7314 series) handles logic and I/O — they serve different parts of the panel, so no direct compatibility issue, but the wiring from the PLC output to the contactor coil is independent of this relay.

MPN
3RU1146-4ED0