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Siemens 3RT1024-3BM40 — Contactors

Siemens 3RT1024-3BM40 SIRIUS Power Contactor, S0, 220 VAC Co

MPN3RT1024-3BM40

Siemens SIRIUS power contactor, size S0, 220 V AC coil, screw-type terminals, 45 mm width, 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

3RT1024-3BM40 — Identification
ParameterValue
Contactor frame sizeS0
3RT1024-3BM40 — 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
3RT1024-3BM40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1024-3BM40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1024-3BM40 — 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
3RT1024-3BM40 — 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
3RT1024-3BM40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1024-3BM40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
3RT1024-3BM40 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth100 mm

Product details

The 220 V AC coil is the control voltage — match it to your control transformer or PLC output card. At 500 V and 690 V, the motor power rating is 7.5 kW, so this contactor handles a standard 7.5 kW induction motor on a 500 V or 690 V line. The auxiliary contact block is rated for switching at various control voltages: 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V. That covers pilot duty for PLC inputs, relay coils, and indicator lamps.

Side-by-side mounting is permitted with no derating, which saves rail space in dense cabinets. The front of the contactor is IP20, meaning finger-safe for panel installation. Main circuit terminals are screw-type, accepting 2x (1 to 2.5 mm²) solid/stranded, 2x (2.5 to 6 mm²), or up to 2x 10 mm². AWG equivalents: 2x (16 to 12), 2x (14 to 10), or 1x 8. Solid wire range is 2x (0.25 to 2.5 mm²).

Coordination & Environment

This matters for selectivity studies and SCCR compliance. Coil consumption: 5.4 W closing power and 5.4 W holding power (DC). The holding power is the same as closing, so the coil driver sees a constant load — no power-save circuit inside this variant.

Frequently asked questions

What is the closest functional equivalent to 3RT1024-3BM40?

The 3RT1023-1AL20 is a close functional peer within the same SIRIUS S0 frame family. The key difference is the coil voltage — the 3RT1023-1AL20 uses a 230 V AC coil versus the 220 V AC coil on this part. For a 220 V control circuit, this part is the correct match; the 3RT1023-1AL20 would drop in mechanically but may not pull in reliably at 220 V if the control voltage sags.

What is the depth of the 3RT1024-3BM40?

The depth is 100 mm, which is standard for the S0 frame size and fits typical 200 mm deep enclosures with clearance for wiring.

What solid wire sizes does the 3RT1024-3BM40 accept?

The main terminals accept 2x (0.25 to 2.5 mm²) solid wire. For stranded wire, the range is 2x (1 to 2.5 mm²) or 2x (2.5 to 6 mm²), with a maximum of 2x 10 mm².

Will 3RT1024-3BM40 drop into a panel specified for 3RT1023-1AL20?

Mechanically yes — same S0 frame, same 45 mm width, same DIN rail mounting. The difference is the coil: this part is 220 V AC, the 3RT1023-1AL20 is 230 V AC. If your control transformer is tapped at 220 V, this is the correct part. If it's 230 V, the 3RT1023-1AL20 is the better fit. Check the control voltage before swapping.

MPN
3RT1024-3BM40