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Siemens 3RU2146-4MB0 SIRIUS, CLASS 10, 690 V

MPN3RU2146-4MB0

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Siemens SIRIUS 3RU2146-4MB0 thermal overload relay, size S3, CLASS 10, 690 V rated, with screw terminals and auxiliary trip message contact.

$107.95Ref. price · indicative, final on quote

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Siemens 3RU2146-4MB0 datasheet (PDF)

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

Specifications

3RU2146-4MB0 — Identification
Parameter	Value
Product brand name	SIRIUS
Product designation	thermal overload relay
Frame size (overload relay)	S3
Combinable contactor sizes	S3
Reference code (IEC 81346-2)	F

3RU2146-4MB0 — Protection & Trip
Parameter	Value
Overload current setting range	80 ... 100 A
Trip class	CLASS 10
Overload release type	thermal

3RU2146-4MB0 — Electrical (main circuit)
Parameter	Value
Rated operational current	100 A
Poles (main circuit)	3
Rated operating frequency	50 ... 60 Hz
Rated insulation voltage (AC, pollution degree 3)	1 000 V
Rated value (AC-3e), max.	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

3RU2146-4MB0 — Auxiliary contacts
Parameter	Value
Auxiliary contacts: NO	1
Auxiliary contacts: NC	1
Auxiliary contacts: CO (changeover)	0
Auxiliary switch short-circuit protection (required fuse)	fuse gG: 6 A, quick: 10 A
Switching current at 24 V	2 A
Switching current at 60 V	0.3 A
Switching current at 110 V	0.22 A
Switching current at 120 V	3 A
Switching current at 125 V	0.22 A
Switching current at 220 V	0.11 A
Switching current at 230 V	2 A
Switching current at 400 V	1 A

3RU2146-4MB0 — Connection & Mounting
Parameter	Value
Mounting / fastening method	Contactor mounting
Mounting position	any
Main-circuit connector arrangement	Top and bottom
Auxiliary/control circuit connection type	screw-type terminals
Removable aux./control terminal	No
Conductor cross-section: solid	2x (2.5 ... 16 mm²)
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)
Conductor range (AWG), main contacts	2x (10 ... 1/0), 1x (10 ... 2/0)
Conductor range (AWG), auxiliary contacts	2x (20 ... 16), 2x (18 ... 14)

3RU2146-4MB0 — Environmental
Parameter	Value
Operating temperature	-40 ... +70 °C
Storage temperature	-55 ... +80 °C
Transport temperature	-55 ... +80 °C
Relative humidity, operating	10 ... 95 %
Max. installation altitude	2 000 m

3RU2146-4MB0 — Mechanical
Parameter	Value
Width	70 mm
Height	105 mm
Depth	125 mm

Product details

The 3RU2146-4MB0: Current production — lifecycle stage is 'current'. No last-time-buy announced. Complies with substance prohibition dated 03/01/2017 (RoHS-like). This is the active variant; no official successor.

Mounting: Contactor mounting with M8 bolts, torque per Siemens. Depth 125 mm, width 70 mm, height 105 mm. Wire sizing: main circuit accepts up to 70 mm² stranded per pole (10-70 mm²). Auxiliary circuit accepts 0.5-2.5 mm² solid/stranded. Ambient operation -40 to +70 °C; storage/transport -55 to +80 °C.