Skip to main content
Log in
Siemens 3RT1023-1BW44 — Contactors

Siemens 3RT1023-1BW44 SIRIUS Power Contactor, S0, 48 VDC Coi

MPN3RT1023-1BW44

Siemens SIRIUS, S0 power contactor, 3RT1023-1BW44, 48 VDC coil, screw terminals, IP20 front, 45 mm wide.

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

3RT1023-1BW44 — Identification
ParameterValue
Contactor frame sizeS0
3RT1023-1BW44 — 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
3RT1023-1BW44 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1023-1BW44 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1023-1BW44 — 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
3RT1023-1BW44 — 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
3RT1023-1BW44 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1023-1BW44 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
3RT1023-1BW44 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth150 mm

Product details

The 48 VDC coil draws 5.4 W both on pick-up and hold, which simplifies the DC supply sizing — no inrush spike to budget for. Motor power ratings reach 4.5 kW at 500 V and 5.5 kW at 690 V, covering common European and export voltage levels. The IP20 front protection keeps fingers and tools out of the live terminals inside the enclosure; the terminals themselves are rated IP00, so the contactor must live inside a cabinet, not out on the plant floor.

Environment and wiring

Main circuit terminals accept solid conductors from 2x (0.5... 1.5 mm²) up to 2x (0.75... 4 mm²), and stranded conductors from 2x (1... 2.5 mm²) up to 2x 10 mm². That range covers standard motor feeder cables up to about 6 AWG without lugging. Side-by-side mounting is allowed with a 6 mm gap to the side, keeping panel density high. Short-circuit coordination is specified: for Type 2 coordination (limited damage after a fault), use a gL/gG fuse rated 25 A; for Type 1 (replace contactor after fault), use 63 A.

Frequently asked questions

Where can I buy 3RT1023-1BW44 and how is it quoted?

This part is sourced through independent distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time.

What is the closest functional alternative to 3RT1023-1BW44?

The closest functional sibling is 3RT1023-1AL20, which shares the same S0 frame and screw-terminal format but uses a different coil voltage. The 3RT1023-1BW44 runs on 48 VDC; the 1AL20 uses a different coil rating. Both mount on the same 35 mm DIN rail and accept the same conductor sizes, so swapping requires only a coil-voltage check on the control transformer.

What compliance documentation does Siemens provide for 3RT1023-1BW44?

As a SIRIUS series product, this contactor carries CE marking for the European market and is designed to meet IEC/EN 60947-4-1. The manufacturer provides a declaration of conformity and technical documentation on request. RoHS and REACH compliance are standard for current-production SIRIUS components.

MPN
3RT1023-1BW44