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Siemens 3RT2045-3XB40-6LA2 SIRIUS Contactor, 24 VDC, 77 A at

MPN3RT2045-3XB40-6LA2

Siemens SIRIUS contactor, size S3, 24 VDC coil, 77 A at 480 V, spring-type terminals, screw and snap-on mounting onto 35 mm DIN rail.

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Siemens 3RT2045-3XB40-6LA2 datasheet (PDF)

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

Specifications

3RT2045-3XB40-6LA2 — Identification
Parameter	Value
Contactor frame size	S3

3RT2045-3XB40-6LA2 — Ratings & Performance
Parameter	Value
Rated operational current, AC-12, max.	10 A
Rated operational current, AC-4 @ 400 V	66 A
Rated value @ 400 V	3 A
Rated value @ 500 V	2 A
Rated value @ 690 V	1 A
Rated value @ 230 V	15 hp
Rated value @ 24 V	10 A
Rated value @ 60 V	2 A
Rated value @ 110 V	1 A
Rated value @ 220 V	0.3 A

3RT2045-3XB40-6LA2 — Control & Coil
Parameter	Value
Control supply voltage type	DC

3RT2045-3XB40-6LA2 — Contacts & Poles
Parameter	Value
Main poles	3
Main NO contacts	3

3RT2045-3XB40-6LA2 — Protection & Coordination
Parameter	Value
Short-circuit coordination type 1, fuse	gG: 250 A (690 V, 100 kA), aM: 160 A (690 V, 100 kA), BS88: 200 A (415 V, 80 kA)
Short-circuit coordination type 2, fuse	gG: 160A (690V,100kA), aM: 80A (690V,100kA), BS88: 125A (415V,80kA)
Aux. switch short-circuit protection, fuse	gG: 10 A (500 V, 1 kA)

3RT2045-3XB40-6LA2 — Connection & Mounting
Parameter	Value
Main circuit connection	screw-type terminals
Aux. / control circuit connection	spring-loaded terminals
Conductor cross-section, solid or stranded	2x (0.5 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule	2x (0.5 ... 1.5 mm²)
Mounting method	screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715
Side-by-side mounting	Yes

3RT2045-3XB40-6LA2 — Durability
Parameter	Value
Durability (operating cycles, typ.)	10 000 000
Durability with aux. switch block (cycles, typ.)	10 000 000

3RT2045-3XB40-6LA2 — Environmental
Parameter	Value
Operating temperature range	-40 ... +70 °C
Storage temperature range	-55 ... +80 °C
Installation altitude, max.	2 000 m

3RT2045-3XB40-6LA2 — Mechanical
Parameter	Value
Width	70 mm
Height	140 mm
Depth	152 mm

Product details

The 3RT2045-3XB40-6LA2: The contactor measures 70 mm wide, 140 mm high, and 152 mm deep.

Coil and Switching Performance

The DC coil operates with a rated value of 24 V, an inrush current peak of 6.5 A, and an operate time of 38 to 57 ms. The contactor is rated for AC-4 duty at a maximum of 300 switching cycles per hour. Auxiliary switch is included.