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Siemens 3RT1023-1AM20 — Contactors

Siemens 3RT1023-1AM20 SIRIUS Power Contactor, S0, 4 kW AC-2

MPN3RT1023-1AM20

Siemens SIRIUS power contactor, S0 size, 3RT1023-1AM20, 4 kW at 400 V AC-2, 8.5 A AC-4, screw terminals, DIN rail mount, IP20 front.

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

3RT1023-1AM20 — Identification
ParameterValue
Contactor frame sizeS0
3RT1023-1AM20 — 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
3RT1023-1AM20 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz208 V
3RT1023-1AM20 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1023-1AM20 — 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
3RT1023-1AM20 — 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
3RT1023-1AM20 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1023-1AM20 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
3RT1023-1AM20 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth91 mm

Product details

The Siemens 3RT1023-1AM20 is a SIRIUS power contactor in the S0 frame size, rated for motor switching at 4 kW under AC-2 duty at 400 V and 8.5 A under AC-4 at 400 V.

AC-4 duty at 8.5 A / 400 V handles plugging and inching — the high-stress cycles that wear contacts faster. For resistive loads, the AC-12 maximum operating current is 10 A. The auxiliary contact block supports 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V, so it can drive small relays or PLC inputs directly without an interposing relay.

Coordination and wiring

Type 2 coordination requires a gL/gG fuse rated 25 A; Type 1 coordination allows a 63 A fuse. The auxiliary terminals take 0.5 to 4 mm².

Frequently asked questions

What are the key ratings for the 3RT1023-1AM20?

AC-2 motor switching at 4 kW / 400 V, AC-4 at 8.5 A / 400 V, and AC-12 resistive at 10 A. Auxiliary contacts handle 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V.

Where can I buy the 3RT1023-1AM20?

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

Will the 3RT1023-1AM20 drop into a panel specified for the 3RT1023-1AL20?

Both are S0 frame contactors with the same mounting footprint and terminal layout, so mechanical fit is identical. The difference is in the coil voltage — the 1AM20 uses a different coil than the 1AL20. Verify coil voltage matches your control circuit before swapping.

MPN
3RT1023-1AM20