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Siemens 3RT1025-1BM44 — Contactors

Siemens 3RT1025-1BM44 SIRIUS Power Contactor, S0, 7.5 kW AC-

MPN3RT1025-1BM44

Siemens SIRIUS S0 power contactor, 3RT1025-1BM44, screw-type terminals, 7.5 kW AC-2 at 400 V, 15.5 A AC-4, 45 mm wide, snap-on DIN rail mount.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RT1025-1BM44 — Identification
ParameterValue
Contactor frame sizeS0
3RT1025-1BM44 — Ratings & Performance
ParameterValue
Rated operational current, AC-4 @ 400 V15.5 A
Rated value @ 400 V3 A
Rated value @ 500 V10 kW
Rated value @ 690 V11 kW
Rated value @ 230 V6 A
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT1025-1BM44 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1025-1BM44 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1025-1BM44 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusefuse gL/gG: 63 A
Short-circuit coordination type 2, fusefuse gL/gG: 25 A
Aux. switch short-circuit protection, fusefuse gL/gG: 10 A
3RT1025-1BM44 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Conductor cross-section, solid2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Side-by-side mountingYes
3RT1025-1BM44 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1025-1BM44 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
3RT1025-1BM44 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth150 mm

Product details

Rated at 7.5 kW in AC-2 duty at 400 V and 15.5 A in AC-4 at 400 V, this contactor handles the inrush and breaking demands of wound-rotor and squirrel-cage motors. AC-2 covers slip-ring motors; AC-4 covers reversing, plugging, and inching — the tougher duty cycle that generates more arc wear.

The 45 mm wide body (S0 frame) fits standard panel layouts. Side-by-side mounting is allowed — no gap needed between units — which saves rail space in dense panels. Main circuit terminals accept 2x (1 to 2.5 mm²) stranded, 2x (2.5 to 6 mm²), or up to 2x 10 mm². Auxiliary/control terminals take 2x (0.5 to 1.5 mm²) solid or 2x (0.75 to 2.5 mm²) stranded, max 2x (0.75 to 4 mm²). That covers most panel wire sizes without needing adapters. The magnet coil draws 5.4 W on pickup and 5.4 W holding — DC holding, so no AC hum and consistent power draw.

For Type 1 coordination (contactor may need replacement after a fault), the fuse can go up to 63 A. This lets you balance protection level against fuse size — Type 2 keeps the contactor in service, Type 1 saves panel space with a larger fuse.

Frequently asked questions

What are the key motor ratings for 3RT1025-1BM44?

It is rated 7.5 kW at AC-2 400 V and 15.5 A at AC-4 400 V. The AC-4 rating governs contact life for reversing or inching duty.

Will 3RT1025-1BM44 drop into a panel specified for 3RT1023-1AL20?

Both are S0-size contactors with the same 45 mm width and DIN-rail mounting, so the footprint and rail clip are identical. Terminal layout and coil voltage may differ — verify the coil rating and auxiliary contact arrangement against your schematic before swapping.

What is the depth of 3RT1025-1BM44?

The depth is 150 mm, which includes the body and terminal projection. Allow clearance for wiring and finger access in the enclosure.

What compliance documentation is available for 3RT1025-1BM44?

The contactor carries a DIN EN 81346-2 reference code Q and is designed for pollution degree 3 environments. Standard Siemens documentation includes CE, RoHS, and REACH declarations; specific certificates can be requested at quote time.

Where can I buy 3RT1025-1BM44 and how is it quoted?

We source this part through independent industrial distribution channels. Submit an RFQ for current pricing and lead time — availability is confirmed at quote time.

MPN
3RT1025-1BM44