Skip to main content
Log in
Siemens 3RT1023-3BF40 — Contactors

Siemens 3RT1023-3BF40 SIRIUS Power Contactor, 110 VDC Coil,

MPN3RT1023-3BF40

Siemens SIRIUS power contactor, 3RT1023-3BF40, S0 frame, 110 VDC coil, screw-type main terminals, spring-loaded auxiliary terminals, IP20 front / IP00 terminals.

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

3RT1023-3BF40 — Identification
ParameterValue
Contactor frame sizeS0
3RT1023-3BF40 — 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
3RT1023-3BF40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1023-3BF40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1023-3BF40 — 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
3RT1023-3BF40 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionspring-loaded terminals
Conductor cross-section, solid2x (0.25 ... 2.5 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 (0.25 ... 1.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022
Side-by-side mountingYes
3RT1023-3BF40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1023-3BF40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Installation altitude, max.2 000 m
3RT1023-3BF40 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth100 mm

Product details

Rated for 4 kW at AC-2 duty on 400 V and 5.5 kW at 690 V, this contactor handles the inductive load of motors — pumps, conveyors, fans — where the AC-2 rating covers starting and running. The 110 V DC coil draws 5.4 W on closing and holding — same figure for both, which means no extra power is needed to keep it sealed. That simplifies the DC supply sizing in the panel.

Main circuit terminals accept solid or stranded wire: 2x (0.25…2.5 mm²), 2x (1…2.5 mm²), 2x (2.5…6 mm²), or up to 2x 10 mm². AWG equivalents are 2x (16…12), 2x (14…10), and 1x 8. Auxiliary terminals take 2x (24…14) AWG. For type 2 coordination (no weld after fault), use a gL/gG fuse rated 25 A. For type 1 coordination (welding allowed), the fuse can be 63 A. This lets the panel designer choose the protection philosophy.

Compliance documentation includes RoHS and REACH substance prohibitance dated July 1, 2006.

Frequently asked questions

What is the closest functional second-source for the 3RT1023-3BF40?

The 3RT1015-1BB42 is a peer in the same SIRIUS family, but it uses a different coil voltage and frame size. The 3RT1023-3BF40 carries a 110 V DC coil in an S0 frame; the 3RT1015-1BB42 is a smaller S00 frame with a 24 V AC coil. It will not drop into the same panel without rewiring and checking the mounting rail.

MPN
3RT1023-3BF40