BOM / RFQ

3RT2025-4KB40

MPN3RT2025-4KB40

power contactor, AC-3e/AC-3, 17 A, 7.5 kW / 400 V, 3-pole, 24 V DC, 0.7-1.25* Us, with plugged-in varistor, auxiliary contacts: 1 NO + 1 NC, ring cable lug connection, size: S0, suitable for PLC outputs, not expandable with auxiliary switch

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Siemens 3RT2025-4KB40 datasheet (PDF)

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

Specifications

3RT2025-4KB40 — Identification
Parameter	Value
Contactor frame size	S0

3RT2025-4KB40 — Ratings & Performance
Parameter	Value
Rated operational current, AC-12, max.	10 A
Rated operational current, AC-4 @ 400 V	15.5 A
Rated value @ 400 V	3 A
Rated value @ 500 V	2 A
Rated value @ 690 V	1 A
Rated value @ 230 V	3 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

3RT2025-4KB40 — Control & Coil
Parameter	Value
Control supply voltage type	DC

3RT2025-4KB40 — Contacts & Poles
Parameter	Value
Main poles	3
Main NO contacts	3
Auxiliary contact reliability	1 faulty switching per 100 million (17 V, 1 mA)

3RT2025-4KB40 — Protection & Coordination
Parameter	Value
Short-circuit coordination type 1, fuse	gG: 63A (690V,100kA), aM: 32A (690V,100kA), BS88: 63A (415V,80kA)
Short-circuit coordination type 2, fuse	gG: 25A (690V,100kA), aM: 20A (690V,100kA), BS88: 25A (415V,80kA)
Aux. switch short-circuit protection, fuse	gG: 10 A (500 V, 1 kA)

3RT2025-4KB40 — Connection & Mounting
Parameter	Value
Main circuit connection	Ring cable lug connection
Aux. / control circuit connection	ring terminal lug connection
Mounting method	screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Side-by-side mounting	Yes