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Siemens 3RT1344-1AC20 — Contactors

Siemens SIRIUS 3RT1344-1AC20 Power Contactor, S3, 42 kW at 2

MPN3RT1344-1AC20

Siemens SIRIUS S3 power contactor, 3RT1344-1AC20, screw-type terminals, 42 kW at 230 V 60 °C, 1000 V insulation, snap-on 35/75 mm rail, IP20 front.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RT1344-1AC20 — Identification
ParameterValue
Contactor frame sizeS3
3RT1344-1AC20 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated value @ 400 V3 A
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
3RT1344-1AC20 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz24 V
3RT1344-1AC20 — Contacts & Poles
ParameterValue
Main poles4
Main NO contacts4
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1344-1AC20 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusefuse gL/gG: 250 A
Short-circuit coordination type 2, fusefuse gL/gG: 125 A
Aux. switch short-circuit protection, fusefuse gL/gG: 10 A
3RT1344-1AC20 — 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 (2.5 ... 16 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 and 75 mm standard mounting rail
Side-by-side mountingYes
3RT1344-1AC20 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1344-1AC20 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1344-1AC20 — Mechanical
ParameterValue
Width93 mm
Height146 mm
Depth139 mm
3RT1344-1AC20 — Specifications
ParameterValue
At AC10 ... 25 ms

Product details

It's rated for 42 kW at 230 V at 60 °C, with an insulation voltage of 1000 V, so it handles the kind of pump, conveyor, or fan duty you'd expect out here in the grease. The coil pulls 10 A at 24 V rated value, and the contactor carries pollution degree 3 — meaning it's built for the conductive dust and grime that collects on a real factory floor, not just a clean lab bench.

Mounts on 35 mm or 75 mm standard DIN rail via screw and snap-on fastening. Side-by-side mounting is allowed.

Dimensions are 146 mm high, 93 mm wide, and 139 mm deep.

Frequently asked questions

What is the depth of 3RT1344-1AC20?

The depth is 139 mm, with a height of 146 mm and width of 93 mm. That depth is the dimension from the mounting rail to the front of the contactor, critical for enclosure fit.

What wire sizes does 3RT1344-1AC20 accept on the control side?

The control terminals accept solid wire: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and max 2x (0.75 to 4 mm²). For stranded power wiring, it takes 2x (10 to 50 mm²).

What compliance documentation does Siemens provide for 3RT1344-1AC20?

The contactor carries a substance prohibition date of 05/01/2012, indicating RoHS compliance. It also holds CE, UL, and CSA approvals typical for the SIRIUS line. Full declarations and certificates are available upon request with your RFQ.

MPN
3RT1344-1AC20