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Siemens 3RU1146-4MB0 — Overload Relays

Siemens 3RU1146-4MB0 SIRIUS Thermal Overload Relay, Class 10

MPN3RU1146-4MB0

Siemens SIRIUS thermal overload relay, 3RU1146-4MB0, Size S3, Class 10, screw-type terminals, IP20 front, ATEX approved.

$114.30Ref. price · indicative, final on quote
Siemens 3RU1146-4MB0 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RU1146-4MB0 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationthermal overload relay
Frame size (overload relay)S3
Combinable contactor sizesS3
Reference code (IEC 81346-2)F
3RU1146-4MB0 — Protection & Trip
ParameterValue
Overload current setting range80 ... 100 A
Trip classCLASS 10
3RU1146-4MB0 — 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)21 W
Per pole7 W
3RU1146-4MB0 — 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
3RU1146-4MB0 — 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), auxiliary contacts2x (20 ... 16), 2x (18 ... 14)
3RU1146-4MB0 — 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
3RU1146-4MB0 — Mechanical
ParameterValue
Width70 mm
Height120 mm
Depth140 mm
3RU1146-4MB0 — Specifications
ParameterValue
Type Of ProtectionDMT 98 ATEX G 001

Product details

The Siemens 3RU1146-4MB0 is a SIRIUS thermal overload relay, Size S3, with Class 10 trip characteristic.

Mounts directly onto a contactor via the fastening method listed as contactor mounting — no DIN rail required, though the relay itself is sized for S3 contactor platforms. Spacing: 6 mm at the side, zero clearance upwards, forwards, backwards, and downwards — so it can be packed tight in a multi-row panel as long as side breathing gaps are respected.

Wiring and terminal capacity

Main circuit terminals accept solid conductors from 2x (0.5... 1.5 mm²) up to 2x (10... 50 mm²) and stranded up to 10... 70 mm². Auxiliary and control circuit terminals are screw-type.

Protection and approvals

Rated for ATEX environments (DMT 98 ATEX G 001). IP20 on the front. Surge voltage resistance rated at 8 kV.

Frequently asked questions

What approvals does 3RU1146-4MB0 carry?

ATEX certification (DMT 98 ATEX G 001,) for explosive-gas environments, plus RoHS compliance (substance prohibition date 07/01/2006,).

MPN
3RU1146-4MB0