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Siemens 3RT1025-3BB40-1AA0 — Contactors

Siemens 3RT1025-3BB40-1AA0 SIRIUS Power Contactor, 24 VDC, S

MPN3RT1025-3BB40-1AA0

Siemens SIRIUS power contactor, 3RT1025-3BB40-1AA0, size S0, 24 VDC coil, screw-type main terminals, spring-loaded auxiliary/control terminals, IP20 front.

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

3RT1025-3BB40-1AA0 — Identification
ParameterValue
Contactor frame sizeS0
3RT1025-3BB40-1AA0 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
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
3RT1025-3BB40-1AA0 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1025-3BB40-1AA0 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1025-3BB40-1AA0 — 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
3RT1025-3BB40-1AA0 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionspring-loaded terminals
Conductor cross-section, solid2x (0.25 ... 2.5 mm²)
Conductor cross-section, solid or stranded2x (1 ... 2,5 mm²), 2x (2,5 ... 6 mm²), max. 2x 10 mm²
Conductor cross-section, finely stranded w/ ferrule2x (0.25 ... 1.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022
Side-by-side mountingYes
3RT1025-3BB40-1AA0 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1025-3BB40-1AA0 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Installation altitude, max.2 000 m
3RT1025-3BB40-1AA0 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth101 mm

Product details

The 24 V DC coil pulls 5.4 W on closing and holds at 5.4 W — a continuous-duty coil, so no external holding-current economizer needed. Rated operational current at AC-12 (resistive) is 10 A maximum. For motor duty, it's rated 7.5 kW at 400 V in AC-2 (slip-ring motor starting), and 15.5 A at 400 V in AC-4 (plugging/reversing/inching). At 500 V it handles 10 kW; at 690 V, 11 kW.

Side-by-side mounting is allowed.

Main circuit terminals accept solid or stranded wire: 2x (0.25–2.5 mm²), 2x (1–2.5 mm²), 2x (2.5–6 mm²), or max 2x 10 mm². AWG equivalents: 2x (16–12), 2x (14–10), 1x 8. Auxiliary terminals accept 2x (24–14) AWG. For type 2 coordination ('no damage' under short circuit), use a gL/gG fuse rated 25 A. For type 1 coordination ('may need replacement after fault'), use a 63 A gL/gG fuse. Mechanical endurance is typical 10 million operations, so it'll outlast most machines in normal cycling.

Compliance: RoHS substance prohibition date is 2006-07-01, so it meets the original RoHS directive. No UL or CSA listing is explicitly stated in the evidence, but the IEC ratings (AC-2, AC-4, pollution degree 3) are standard for European-spec panels.

Frequently asked questions

What's the closest functional second-source — 3RT1015-1BB42?

The 3RT1015-1BB42 is a smaller frame size (S00 vs S0) with a different coil voltage and terminal arrangement. It won't drop into a panel wired for the 3RT1025-3BB40-1AA0 without rewiring the main power terminals and checking the mounting rail space. The 3RT1025-3BB40-1AA0 is the correct S0-frame part for 24 VDC coil applications.

What is the depth of this contactor?

101 mm. That's the dimension from the mounting surface to the furthest protrusion — critical for shallow enclosures or tight gland-plate clearance.

MPN
3RT1025-3BB40-1AA0