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Siemens 3RT1025-3BB44-3MA0 — Contactors

Siemens 3RT1025-3BB44-3MA0 SIRIUS Power Contactor, 24 VDC, S

MPN3RT1025-3BB44-3MA0

Siemens SIRIUS power contactor, size S0, 24 VDC coil, screw terminals, 7.5 kW AC-2 at 400 V, IP20 front, 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

3RT1025-3BB44-3MA0 — Identification
ParameterValue
Contactor frame sizeS0
3RT1025-3BB44-3MA0 — 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
3RT1025-3BB44-3MA0 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1025-3BB44-3MA0 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1025-3BB44-3MA0 — 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
3RT1025-3BB44-3MA0 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Conductor cross-section, solid2x (0.25 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.25 ... 1.5 mm²)
Side-by-side mountingYes
3RT1025-3BB44-3MA0 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1025-3BB44-3MA0 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
3RT1025-3BB44-3MA0 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth150 mm

Product details

Rated for AC-2 duty at 7.5 kW and AC-4 at 15.5 A, both at 400 V, this contactor handles squirrel-cage motor starting and plugging/reversing applications. The 24 VDC coil draws 5.4 W holding power, with switching capacity rated at 10 A at 24 VDC and 0.3 A at 220 VDC.

Screw-type terminals on the main circuit accept 2x (0.25 to 2.5 mm²) solid or stranded, up to 2x 10 mm² maximum. AWG equivalents are 2x (16 to 12) and 2x (14 to 10). The two instantaneous auxiliary contacts are rated for AC-12 at 10 A maximum.

Ratings and Coordination

Motor power ratings: 10 kW at 500 V and 11 kW at 690 V. For short-circuit coordination, type 1 requires a gL/gG fuse rated 63 A; type 2 requires 25 A.

Frequently asked questions

What compliance documentation is available?

The part carries a current lifecycle status and is manufactured to Siemens SIRIUS standards. Specific RoHS, REACH, and UL documentation should be requested at time of order for your jurisdiction.

MPN
3RT1025-3BB44-3MA0