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Siemens 3RT1023-1BP40 — Contactors

Siemens 3RT1023-1BP40 SIRIUS Power Contactor, S0, 4 kW AC-2

MPN3RT1023-1BP40

Siemens SIRIUS power contactor, S0 frame, 3RT1023-1BP40, 4 kW at 400 V AC-2, 8.5 A AC-4, 24 VDC coil, screw terminals, IP20 front, snap-on DIN rail.

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

3RT1023-1BP40 — Identification
ParameterValue
Contactor frame sizeS0
3RT1023-1BP40 — Ratings & Performance
ParameterValue
Rated operational current, AC-4 @ 400 V8.5 A
Rated value @ 400 V3 A
Rated value @ 500 V4.5 kW
Rated value @ 690 V5.5 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
3RT1023-1BP40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1023-1BP40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1023-1BP40 — 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
3RT1023-1BP40 — 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
3RT1023-1BP40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1023-1BP40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
3RT1023-1BP40 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth101 mm

Product details

It carries a 4 kW rating at 400 V in AC-2 duty (slip-ring motors, reversing) and 8.5 A in AC-4 (plugging, inching). The 24 VDC coil draws 5.4 W on pick-up and hold — no economizer needed, but verify free-wheel diode polarity on the DC side before energizing inductive loads downstream.

Side-by-side mounting is permitted with 6 mm spacing to adjacent devices. Pollution degree 3 environment rated, so it handles conductive dust and humidity typical of industrial enclosures without conformal coating.

Termination and coordination

Screw-type terminals on the main circuit accept 2x (1–2.5 mm²) solid or 2x (2.5–6 mm²) stranded, up to 2x 10 mm² max. For type 2 coordination (no weld), use gL/gG fuses at 25 A; type 1 coordination allows 63 A fuses. The auxiliary contact block is rated for 10 A AC-12 (resistive) and switches down to 0.3 A at 220 V DC — useful for PLC-level signal isolation.

Frequently asked questions

How do I get current pricing and availability for 3RT1023-1BP40?

Submit an RFQ through this listing. The part is sourced to order via independent distribution; pricing and stock status are confirmed at quote time.

What is 3RT1023-1BP40's AC-2 motor rating?

It is rated 4 kW at 400 V in AC-2 duty, which covers slip-ring motors and reversing applications.

Will 3RT1023-1BP40 drop into a panel specified around 3RT1023-1AL20?

Mechanically yes — both are S0 frame with the same 45 mm width and DIN-rail mount. The difference is the coil voltage; the 1BP40 uses 24 VDC, the 1AL20 uses a different coil. No rewiring of the main power circuit is needed, but the coil supply must match.

MPN
3RT1023-1BP40