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Siemens 3RT2045-1KB40 SIRIUS Coupling Contactor, 24V DC, S3

MPN3RT2045-1KB40

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Siemens SIRIUS S3 coupling contactor, 3RT2045-1KB40, 24 V DC coil, screw-type terminals, DIN rail mounting, 10 million mechanical cycles.

$191.77 – $460.85Ref. price · indicative, final on quote

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Siemens 3RT2045-1KB40 datasheet (PDF)

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

Specifications

3RT2045-1KB40 — Identification
Parameter	Value
Contactor frame size	S3

3RT2045-1KB40 — 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

3RT2045-1KB40 — Control & Coil
Parameter	Value
Control supply voltage type	DC

3RT2045-1KB40 — Contacts & Poles
Parameter	Value
Main poles	3
Main NO contacts	3
Auxiliary contact reliability	1 faulty switching per 100 million (17 V, 1 mA)

3RT2045-1KB40 — 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)

3RT2045-1KB40 — Connection & Mounting
Parameter	Value
Main circuit connection	screw-type terminals
Aux. / control circuit connection	screw-type terminals
Conductor cross-section, solid	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 w/ ferrule	2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Mounting method	screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Side-by-side mounting	Yes

3RT2045-1KB40 — Durability
Parameter	Value
Durability (operating cycles, typ.)	10 000 000
Durability with aux. switch block (cycles, typ.)	10 000 000

3RT2045-1KB40 — Environmental
Parameter	Value
Operating temperature range	-25 ... +60 °C
Storage temperature range	-55 ... +80 °C
Installation altitude, max.	2 000 m

3RT2045-1KB40 — Mechanical
Parameter	Value
Width	70 mm
Height	140 mm
Depth	152 mm

3RT2045-1KB40 — Specifications
Parameter	Value
At AC	16.3g / 5 ms, 10.g / 10 ms

Product details

The Siemens 3RT2045-1KB40 is a SIRIUS S3 coupling contactor rated for 24 V DC coil voltage, with screw-type terminals and a mechanical life of 10 million operations. It snaps onto 35 mm DIN rail per DIN EN 60715 and accepts solid conductors from 2.5 to 16 mm² or stranded from 6 to 70 mm². Dimensions are 70 mm wide, 140 mm high, and 152 mm deep, with mounting position flexibility of +/-180° rotation on a vertical surface and +/-22.5° tilt forward or backward. Switching frequency at AC-3 duty reaches 1 000 operations per hour; at AC-1 it's 900 per hour.