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Siemens 3RT1024-1BV40 — Contactors

Siemens 3RT1024-1BV40 SIRIUS Power Contactor, S0, 7.5 kW at

MPN3RT1024-1BV40

Siemens SIRIUS 3RT1024-1BV40 power contactor, S0 frame, screw-type terminals, 24 VDC coil, 7.5 kW at 400 V AC-3, IP20 front protection.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
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Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RT1024-1BV40 — Identification
ParameterValue
Contactor frame sizeS0
3RT1024-1BV40 — 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
3RT1024-1BV40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1024-1BV40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1024-1BV40 — 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
3RT1024-1BV40 — 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
3RT1024-1BV40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1024-1BV40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
3RT1024-1BV40 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth101 mm

Product details

It handles 7.5 kW at 400 V in AC-3 duty and the same at 690 V, so it's sized for standard three-phase induction motors up to about 10 hp on a 400 V line. The 24 VDC coil draws 5.4 W both on pickup and hold, which simplifies the DC supply sizing in the panel — no inrush spike to budget for.

Where it fits — panel and mounting

The S0 footprint is 45 mm wide by 85 mm tall by 101 mm deep, so it takes up a single 45 mm slot on the rail — standard for this class. Side-by-side mounting is allowed with a 6 mm gap to the side, which keeps the row dense without derating.

The AC-3 rating at 400 V is 7.5 kW — that's the motor switching number that matters for most conveyor, pump, and fan applications. For auxiliary contacts, the 24 V rated value is 10 A, dropping to 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V — these are the DC switching limits for the control circuit, so if you're feeding a PLC input, stay within these curves.

Wiring and protection

Main circuit terminals are screw-type, accepting 2x (0.5 to 1.5 mm²) solid, 2x (0.75 to 2.5 mm²) stranded, or up to 4 mm² max. For AWG, that's 2x (16 to 12) solid, 2x (14 to 10) stranded, or 1x 8. For short-circuit protection, Type 2 coordination requires a 25 A gL/gG fuse; Type 1 allows up to 63 A. This matters if the panel spec calls for Type 2 — you need the 25 A fuse limit to avoid damaging the contactor on a fault.

Frequently asked questions

What are the key motor ratings for this contactor?

It is rated for 7.5 kW at 400 V in AC-3 duty and the same 7.5 kW at 690 V. For AC-4 (reversing or inching) at 400 V, the rating is 12.5 A.

What is the coil voltage and power draw?

The coil is 24 VDC, drawing 5.4 W for both closing and holding — no inrush spike to account for in the DC supply sizing.

What is the physical size and mounting?

It is an S0 frame contactor, 45 mm wide, 85 mm high, 101 mm deep. It snaps onto a 35 mm DIN rail per DIN EN 50022 or can be screw-mounted.

What wire sizes does the screw terminal accept?

Main terminals accept 2x (0.5 to 1.5 mm²) solid, 2x (0.75 to 2.5 mm²) stranded, or max 2x (0.75 to 4 mm²). AWG equivalents are 2x (16 to 12) solid, 2x (14 to 10) stranded, or 1x 8.

MPN
3RT1024-1BV40