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Siemens 3RT1344-1AF00 — Contactors

Siemens 3RT1344-1AF00 SIRIUS Power Contactor, Size S3, 42 kW

MPN3RT1344-1AF00

Siemens SIRIUS power contactor, size S3, order code 3RT1344-1AF00, rated 42 kW at 230 V 60 °C, screw-type terminals, IP20 front, snap-on DIN rail mounting.

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

Specifications

3RT1344-1AF00 — Identification
ParameterValue
Contactor frame sizeS3
3RT1344-1AF00 — 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
3RT1344-1AF00 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz110 V
3RT1344-1AF00 — Contacts & Poles
ParameterValue
Main poles4
Main NO contacts4
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1344-1AF00 — 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
3RT1344-1AF00 — 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
3RT1344-1AF00 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1344-1AF00 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1344-1AF00 — Mechanical
ParameterValue
Width93 mm
Height146 mm
Depth139 mm
3RT1344-1AF00 — Specifications
ParameterValue
At AC10 ... 25 ms

Product details

SIRIUS power contactor, size S3 — 42 kW at 230 V

The Siemens 3RT1344-1AF00 is a SIRIUS power contactor in size S3, rated for 42 kW at 230 V at 60 °C.

Mounting and wiring — DIN rail, side-by-side, conductor range

Snap-on or screw-fixed onto 35 mm or 75 mm DIN rail. Side-by-side mounting permitted. Main contact terminals accept stranded 2x (10... 50 mm²) and solid 2x (0.5... 1.5 mm²) up to 2x (0.75... 4 mm²).

Switching performance and coordination

The maximum switching rate at AC-1 is 1 000 operations per hour. For short-circuit coordination with type of assignment 2, a gL/gG fuse rated 125 A is required. The contactor's typical mechanical life is 10 000 000 operations.

Auxiliary contact ratings across voltages

Auxiliary contact ratings vary by voltage: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V, 6 A at 230 V, and 3 A at 400 V. The rated frequency is 50 Hz, with an operating factor of 0.8 to 1.1 at 50 Hz.

Frequently asked questions

What compliance documentation does 3RT1344-1AF00 provide?

The part carries a substance prohibition date of 05/01/2012, supporting RoHS and REACH compliance. Rated insulation voltage is 1 000 V, surge voltage resistance is 6 kV, and pollution degree is 3. The front face is IP20; terminal area is IP00.

MPN
3RT1344-1AF00