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Siemens 3RT1023-1BA40 — Contactors

Siemens 3RT1023-1BA40 SIRIUS Power Contactor, 12 VDC Coil, S

MPN3RT1023-1BA40

Siemens SIRIUS power contactor, 3RT1023-1BA40, S0 frame, 12 VDC coil, screw terminals, 45 mm wide, IP20 front, snap-on DIN rail mount.

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

3RT1023-1BA40 — Identification
ParameterValue
Contactor frame sizeS0
3RT1023-1BA40 — 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
3RT1023-1BA40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1023-1BA40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1023-1BA40 — 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
3RT1023-1BA40 — 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
3RT1023-1BA40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1023-1BA40 — Environmental
ParameterValue
Installation altitude, max.2 000 m
3RT1023-1BA40 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth101 mm

Product details

The 12 VDC coil draws 5.4 W on pickup and hold — same figure, so no economizer circuit inside; the coil stays at full power as long as it's energized.

Rated operational current varies by voltage and duty. At 24 V it switches 10 A; at 230 V it handles 6 A; at 400 V it's rated 3 A. For motor loads under AC-2 duty (slip-ring motors, starting/stopping under load) at 400 V it's good for 4 kW. Under AC-4 (plugging, inching, reversing) at 400 V it carries 8.5 A — that's the tougher duty cycle, so if your application does frequent reversals, size on the AC-4 number, not the AC-1 or AC-3 line. Electrical life will be shorter and depends on switching current and duty. With Type 1 coordination (contactor may need replacement after a fault) use a 63 A gL/gG fuse.

Width is 45 mm, height 85 mm, depth 101 mm — fits a standard S0 footprint. Main circuit terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²) solid or stranded. Auxiliary terminals take 2x (1 to 2.5 mm²) or max 2x 10 mm². The screw terminals are the same type throughout — no mix of spring-cage and screw on this variant.

Frequently asked questions

Where can I buy 3RT1023-1BA40 and how do I get a price?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time.

What is 3RT1023-1BA40's listed depth?

The listed depth is 101 mm, with a width of 45 mm and height of 85 mm — standard S0 frame dimensions.

MPN
3RT1023-1BA40