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Siemens 3RT1024-3BW40 — Contactors

Siemens 3RT1024-3BW40 SIRIUS Power Contactor, S0, 5.5 kW AC-

MPN3RT1024-3BW40

Siemens SIRIUS power contactor, size S0, 3RT1024-3BW40, screw-type terminals, DC magnet coil, 5.5 kW at AC-2 400 V, 12.5 A at AC-4 400 V.

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

3RT1024-3BW40 — Identification
ParameterValue
Contactor frame sizeS0
3RT1024-3BW40 — Ratings & Performance
ParameterValue
Rated operational current, AC-4 @ 400 V12.5 A
Rated value @ 400 V3 A
Rated value @ 500 V7.5 kW
Rated value @ 690 V7.5 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
3RT1024-3BW40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1024-3BW40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1024-3BW40 — 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
3RT1024-3BW40 — 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
3RT1024-3BW40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1024-3BW40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
3RT1024-3BW40 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth100 mm

Product details

Rated at 5.5 kW in AC-2 duty at 400 V, this contactor handles wound-rotor motor starting and reversing applications.

The DC magnet coil draws 5.4 W during both closing and holding, which simplifies the control transformer sizing — no inrush peak to budget for. The coil operates across a range of DC voltages; at 24 V rated value it switches 10 A on the auxiliary contacts, and at 60 V rated value it switches 2 A.

For Type 1 coordination (contactor may need replacement after fault), the fuse can be gL/gG 63 A. This lets the panel builder choose between protecting the contactor or minimizing fuse size, depending on the application's criticality.

Mounting and environment

Side-by-side mounting is permitted, so multiple contactors pack tightly in a row without derating. The front face carries IP20 protection; the terminals themselves are IP00, meaning the wiring compartment expects enclosure protection from the panel. Pollution degree 3 means it tolerates conductive pollution in industrial atmospheres — typical for a control panel not in a clean room.

Frequently asked questions

What are the key motor ratings for this contactor?

At AC-2 duty on 400 V it is rated 5.5 kW. At AC-4 reversing duty on 400 V it is rated 12.5 A. At 690 V AC-3 duty it is rated 7.5 kW.

What fuse coordination does this contactor require?

For Type 2 coordination (no damage to the contactor), use a gL/gG 25 A fuse upstream. For Type 1 coordination (contactor may be sacrificial), use a gL/gG 63 A fuse.

Does this contactor mount on standard DIN rail?

Yes, it mounts via screw or snap-on onto 35 mm standard mounting rail per DIN EN 50022. Side-by-side mounting is allowed.

What is the coil power consumption?

The DC magnet coil draws 5.4 W during both closing and holding — no inrush peak.

MPN
3RT1024-3BW40