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Siemens 3RT1023-1BF40 — Contactors

Siemens 3RT1023-1BF40 SIRIUS Power Contactor, 110 V coil, S0

MPN3RT1023-1BF40

Siemens SIRIUS power contactor, size S0, 3RT1023-1BF40, 110 V DC coil, screw-type terminals, IP20 front, 45 mm width.

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

3RT1023-1BF40 — Identification
ParameterValue
Contactor frame sizeS0
3RT1023-1BF40 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
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
3RT1023-1BF40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1023-1BF40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1023-1BF40 — 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
3RT1023-1BF40 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control 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, solid or stranded2x (1 ... 2,5 mm²), 2x (2,5 ... 6 mm²), max. 2x 10 mm²
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022
Side-by-side mountingYes
3RT1023-1BF40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1023-1BF40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Installation altitude, max.2 000 m
3RT1023-1BF40 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth101 mm

Product details

It carries a 110 V DC coil that draws 5.4 W during both closing and holding — the DC hold is the same as the pull-in power, so the coil driver sees a constant load once picked. The contactor is rated for AC-2 duty at 400 V at 4 kW and AC-4 at 400 V at 8.5 A, which covers reversing and inching applications where the load is switched under full motor current. For AC-12 resistive loads it handles 10 A maximum. Motor power ratings are 4.5 kW at 500 V and 5.5 kW at 690 V, making it suitable for 400 V class motors in the 4 kW range with headroom.

The 45 mm width and 85 mm height fit standard S0 panel layouts. Side-by-side mounting is permitted, which saves rail space in multi-contactor groups. Screw-type terminals on both main and auxiliary circuits accept 2x (0.5...1.5 mm²) solid or 2x (0.75...2.5 mm²) stranded for control wiring, and up to 2x 10 mm² on the main poles. AWG equivalents are 2x (16...12) solid and 2x (14...10) stranded for mains.

Protection and environment

Type 1 coordination requires a 63 A gL/gG fuse; Type 2 coordination needs a 25 A gL/gG fuse. This lets the designer choose between simpler coordination (Type 1) or reduced downstream damage after a fault (Type 2).

RoHS compliance is confirmed with a substance prohibition date of 01.07.2006, covering the original EU RoHS directive.

Frequently asked questions

What are the key motor ratings for the 3RT1023-1BF40?

AC-2 at 400 V: 4 kW. AC-4 at 400 V: 8.5 A. Motor power at 500 V: 4.5 kW. Motor power at 690 V: 5.5 kW.

What wire sizes does the 3RT1023-1BF40 accept?

Main terminals: 2x (0.5...1.5 mm²) solid, 2x (0.75...2.5 mm²) stranded, max 2x (0.75...4 mm²). Auxiliary terminals: 2x (1...2.5 mm²) solid, 2x (2.5...6 mm²) stranded, max 2x 10 mm². AWG equivalents: main 2x (16...12) solid, 2x (14...10) stranded; auxiliary 2x (20...16) solid, 2x (18...14) stranded.

What compliance documentation is available for the 3RT1023-1BF40?

RoHS compliance with substance prohibition date 01.07.2006. The reference code per IEC 81346-2 is Q. Pollution degree 3 per IEC 60947-1.

MPN
3RT1023-1BF40