BOM / RFQ

3RU5146-4LB1 - Siemens

MPN3RU5146-4LB1

Overload relay 70...90 A size S3, class 10 for motor protection for individual mounting main circuit: screw connection AUX. circuit: screw connection manual automatic reset

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

Specifications

3RU5146-4LB1 — Identification
Parameter	Value
Product brand name	SIRIUS
Product designation	Thermal overload relay
Combinable contactor sizes	S3

3RU5146-4LB1 — Protection & Trip
Parameter	Value
Overload current setting range	70 ... 90 A
Trip class	CLASS 10
Overload release type	thermal

3RU5146-4LB1 — Electrical (main circuit)
Parameter	Value
Rated operational current	90 A
Poles (main circuit)	3
Rated operating frequency	50 ... 60 Hz
Rated insulation voltage (AC, pollution degree 3)	1 000 V
Rated surge withstand voltage	8 kV
Main current circuit	screw-type terminals
Power loss at rated current (hot)	21 W
Per pole	7 W

3RU5146-4LB1 — Auxiliary contacts
Parameter	Value
Auxiliary switch short-circuit protection (required fuse)	fuse gL/gG: 6 A, quick: 10 A
Switching current at 24 V	1 A
Switching current at 110 V	0.22 A
Switching current at 230 V	2 A

3RU5146-4LB1 — Connection & Mounting
Parameter	Value
Mounting / fastening method	stand-alone installation
Mounting position	with vertical mounting surface +/-135° rotatable, with vertical mounting surface +/- 45° tiltable to the front and back
Main-circuit connector arrangement	Top and bottom
Auxiliary/control circuit connection type	screw-type terminals
Conductor cross-section: solid or stranded	2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor cross-section: finely stranded with ferrule	2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)