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Siemens 3RT1023-1AC20 — Contactors

Siemens 3RT1023-1AC20 SIRIUS Power Contactor, 24 VAC/50-60 H

MPN3RT1023-1AC20

Siemens SIRIUS power contactor, 3RT1023-1AC20, size S0, 24 VAC 50/60 Hz coil, screw terminals, 4 kW AC-2 at 400 V, 8.5 A AC-4.

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

3RT1023-1AC20 — Identification
ParameterValue
Contactor frame sizeS0
3RT1023-1AC20 — 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
3RT1023-1AC20 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz24 V
3RT1023-1AC20 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1023-1AC20 — 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
3RT1023-1AC20 — 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
3RT1023-1AC20 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1023-1AC20 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Installation altitude, max.2 000 m
3RT1023-1AC20 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth91 mm

Product details

Rated 4 kW in AC-2 duty at 400 V, this contactor handles slip-ring motor starting and reversing. For AC-4 plugging and inching, it carries 8.5 A — the rating that governs real-world reversing or jogging cycles. Front face is IP20; terminals are IP00 — panel builders should maintain at least 10 mm clearance to grounded metal around the screw terminals.

Coordination and wiring

Type 1 coordination requires a 63 A gL/gG fuse upstream; Type 2 coordination needs 25 A. The main circuit screw terminals accept 2x (1–2.5 mm²) solid or stranded, up to 2x 10 mm² max — enough for the 4 kW motor circuit without a separate terminal block. Auxiliary and control circuit terminals use screw-type connections accepting 2x (0.5–1.5 mm²) solid, up to 2x 4 mm² max. The 24 VAC coil draws about 10 A inrush at rated voltage, settling to holding current — factor this into control transformer sizing.

Switching capacity and environment

Rated operational current for AC loads: 6 A at 230 V, 3 A at 400 V, 0.3 A at 220 V DC.

Frequently asked questions

Where can I buy the 3RT1023-1AC20 and get current pricing?

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 the closest functional second-source to the 3RT1023-1AC20?

The 3RT1023-1AL20 is the same SIRIUS size S0 contactor but with a 24 VDC coil instead of 24 VAC. It drops into the same DIN rail footprint and terminal layout — no rewiring needed if the control voltage is DC. For AC coil applications, the 1AC20 is the correct variant.

What is the 3RT1023-1AC20's depth?

The depth is 91 mm, with a width of 45 mm and height of 85 mm — fits standard S0 contactor spacing on 35 mm DIN rail.

Will the 3RT1023-1AC20 drop into a panel specified around the 3RT1023-1AL20 without rewiring?

Yes, mechanically identical — same S0 frame, same 45 mm width, same screw terminal layout, same DIN rail clip. The only difference is the coil: 24 VAC vs 24 VDC. If the control circuit is AC, swap the contactor directly; if DC, use the 1AL20 instead.

What compliance documentation does Siemens provide for the 3RT1023-1AC20?

RoHS compliance is documented with a substance prohibition date of 01.07.2006. The part carries IEC 60947-4-1 ratings and is marked with IEC 81346-2 function code Q.

MPN
3RT1023-1AC20