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Siemens 3RT2344-1AN20 — Contactors

Siemens 3RT2344-1AN20 SIRIUS Contactor, Size S3, 10A at 24V

MPN3RT2344-1AN20
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Siemens SIRIUS contactor, size S3, order code 3RT2344-1AN20, screw-type coil terminals, auxiliary switch, 10A at 24V AC, 152 mm depth.

Siemens 3RT2344-1AN20 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RT2344-1AN20 — Identification
ParameterValue
Contactor frame sizeS3
3RT2344-1AN20 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V6 A
Rated value @ 24 V10 A
Rated value @ 60 V6 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2344-1AN20 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.35
Rated value @ 50 Hz220 V
3RT2344-1AN20 — Contacts & Poles
ParameterValue
Main poles4
Main NO contacts4
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2344-1AN20 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegG: 250 A (690 V, 100 kA)
Short-circuit coordination type 2, fusegR: 250 A (690 V, 100 kA)
Aux. switch short-circuit protection, fusegG: 10 A (690 V, 1 kA)
3RT2344-1AN20 — 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)
Conductor cross-section, solid or stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 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 DIN rail according to DIN EN 60715
Side-by-side mountingYes
3RT2344-1AN20 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2344-1AN20 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2344-1AN20 — Mechanical
ParameterValue
Width96 mm
Height140 mm
Depth152 mm
3RT2344-1AN20 — Specifications
ParameterValue
At AC10 ... 21 ms

Product details

The Siemens 3RT2344-1AN20 is a SIRIUS-branded contactor in the size S3 frame.

Size S3 tells you the physical envelope: 140 mm high, 96 mm wide, 152 mm deep. Plan for at least 20 mm forward clearance for arc chutes and wiring. The main contact wiring accepts stranded cable up to 70 mm². The 10 A rating at 24 V AC is the resistive-load figure. At 400 V AC the same contacts are rated 3 A, and at 600 V AC it drops to 0.1 A — that voltage derating curve matters if you are switching a control transformer primary or a small heater bank at line voltage.

Deployment context

The screw-type coil terminals are a field-service detail: you can land the control wires with a standard screwdriver, no special tool needed. The auxiliary switch is already attached, so you do not need to order a separate side-mount block for basic status feedback to a PLC input.

Frequently asked questions

What is the depth of 3RT2344-1AN20?

The depth is 152 mm. Plan for at least 20 mm forward clearance beyond that for arc chutes and wiring.

What wire sizes does the main contact accept?

Stranded cable from 6 to 70 mm². The coil and auxiliary terminals accept solid or stranded from 0.5 to 2.5 mm².

Does 3RT2344-1AN20 include an auxiliary switch?

Yes, an auxiliary switch is included as standard equipment on this contactor.

MPN
3RT2344-1AN20