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Siemens 3RT1023-1AC20-1AA0 — Contactors

Siemens 3RT1023-1AC20-1AA0 SIRIUS Power Contactor, 24 VAC 50

MPN3RT1023-1AC20-1AA0

Siemens SIRIUS power contactor, S0 frame, 3RT1023-1AC20-1AA0, 24 VAC 50/60 Hz coil, screw-type terminals, 45 mm width, IP20 front protection.

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

3RT1023-1AC20-1AA0 — Identification
ParameterValue
Contactor frame sizeS0
3RT1023-1AC20-1AA0 — 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
3RT1023-1AC20-1AA0 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz24 V
3RT1023-1AC20-1AA0 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1023-1AC20-1AA0 — 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
3RT1023-1AC20-1AA0 — 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
3RT1023-1AC20-1AA0 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1023-1AC20-1AA0 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
3RT1023-1AC20-1AA0 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth91 mm

Product details

The 24 VAC coil accepts both 50 Hz and 60 Hz supplies, pulling in reliably across the 0.8–1.1x rated voltage range at 50 Hz and 0.85–1.1x at 60 Hz. Rated for AC-2 duty at 4 kW and AC-4 at 8.5 A, both at 400 V, this contactor handles reversing and plugging applications where the load current is interrupted under motor starting or braking conditions.

The auxiliary contact block carries a 10 A rating at 24 V, stepping down to 6 A at 230 V and 3 A at 400 V — enough for signaling back to a PLC input or holding a control relay. For motor loads, the main contacts are rated 4.5 kW at 500 V and 5.5 kW at 690 V, so it can switch a 5.5 kW motor on a 690 V line if the duty cycle stays within the AC-3 curve. Short-circuit coordination is specified: type 2 coordination requires a 25 A gL/gG fuse, while type 1 allows a 63 A gL/gG fuse. That tells the panel builder what upstream protection keeps the contactor operational after a fault (type 2) versus just preventing a fire (type 1).

Screw-type terminals on the main circuit accept 2x (1–2.5 mm²) solid or 2x (2.5–6 mm²) stranded, with a maximum of 2x 10 mm². The auxiliary terminals handle 2x (0.5–1.5 mm²) solid or 2x (0.75–2.5 mm²) stranded. Front protection is IP20 — safe for finger contact inside an enclosure — while the terminal area is IP00, meaning the live parts are exposed and the panel door must be interlocked or tool-accessed. The 24 VAC coil draws about 10 A inrush at pickup, settling to a lower holding current — verify the control transformer is sized for the inrush if multiple contactors pick up simultaneously.

Frequently asked questions

How do I get current pricing and availability for 3RT1023-1AC20-1AA0?

Submit an RFQ through this listing. Pricing and stock are confirmed at quote time through our sourcing channels — we do not publish live prices or counts on this page.

What is the closest functional second-source to 3RT1023-1AC20-1AA0?

The 3RT1023-1AL20 is a close sibling — same S0 frame, same coil voltage family, but with a different auxiliary contact configuration. Verify the auxiliary contact count and wiring before swapping, as the 1AL20 may have a different number of NO/NC contacts. The 3RT1023-1AP00 is another variant with a different coil voltage. Neither is a drop-in without checking the specific auxiliary arrangement.

Will 3RT1023-1AC20-1AA0 drop into a panel specified around 3RT1023-1AL20 without rewiring?

Mechanically yes — same S0 frame, same 45 mm width, same DIN rail mounting. Electrically, the coil is 24 VAC on both, so the control wiring is compatible. The difference is in the auxiliary contact block: the 1AL20 variant may have a different number or arrangement of auxiliary contacts. Check the auxiliary contact configuration on your existing panel's schematic before swapping.

What compliance documentation does this brand provide for 3RT1023-1AC20-1AA0?

As a Siemens SIRIUS product, it carries CE marking for the European market and is designed to meet IEC/EN 60947-4-1 standards for contactors. RoHS and REACH compliance declarations are available from Siemens documentation. UL/CSA listings are typical for the SIRIUS family, but verify the specific file number for your jurisdiction.

MPN
3RT1023-1AC20-1AA0