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Siemens 3RT2344-1AL20 SIRIUS Contactor, S3 Size, 70 mm²

Name: 3RT2344-1AL20
Brand: Siemens
SKU: 3RT2344-1AL20
Availability: LimitedAvailability
Author: Calibration Cal

MPN3RT2344-1AL20

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Siemens SIRIUS 3RT2344-1AL20 contactor, size S3, screw-type terminals, 70 mm² stranded main circuit capacity, screw and snap-on mounting on 35 mm DIN rail per DIN EN 60715.

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Siemens 3RT2344-1AL20 datasheet (PDF)

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

Specifications

3RT2344-1AL20 — Identification
Parameter	Value
Contactor frame size	S3

3RT2344-1AL20 — Ratings & Performance
Parameter	Value
Rated operational current, AC-12, max.	10 A
Rated value @ 400 V	3 A
Rated value @ 500 V	2 A
Rated value @ 690 V	1 A
Rated value @ 230 V	6 A
Rated value @ 24 V	10 A
Rated value @ 60 V	6 A
Rated value @ 110 V	1 A
Rated value @ 220 V	0.3 A

3RT2344-1AL20 — Control & Coil
Parameter	Value
Control supply voltage type	AC
Rated value @ 50 Hz	0.35
Rated value @ 50 Hz	230 V

3RT2344-1AL20 — Contacts & Poles
Parameter	Value
Main poles	4
Main NO contacts	4
Auxiliary contact reliability	1 faulty switching per 100 million (17 V, 1 mA)

3RT2344-1AL20 — Protection & Coordination
Parameter	Value
Short-circuit coordination type 1, fuse	gG: 250 A (690 V, 100 kA)
Short-circuit coordination type 2, fuse	gR: 250 A (690 V, 100 kA)
Aux. switch short-circuit protection, fuse	gG: 10 A (690 V, 1 kA)

3RT2344-1AL20 — Connection & Mounting
Parameter	Value
Main circuit connection	screw-type terminals
Aux. / control circuit connection	screw-type terminals
Conductor cross-section, solid	2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor cross-section, solid or stranded	2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule	2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Mounting method	screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Side-by-side mounting	Yes

3RT2344-1AL20 — Durability
Parameter	Value
Durability (operating cycles, typ.)	10 000 000
Durability with aux. switch block (cycles, typ.)	10 000 000

3RT2344-1AL20 — Environmental
Parameter	Value
Operating temperature range	-25 ... +60 °C
Storage temperature range	-55 ... +80 °C
Installation altitude, max.	2 000 m

3RT2344-1AL20 — Mechanical
Parameter	Value
Width	96 mm
Height	140 mm
Depth	152 mm

3RT2344-1AL20 — Specifications
Parameter	Value
At AC	10 ... 21 ms

Product details

Wiring and conductor sizing

The 3RT2344-1AL20: The main circuit accepts stranded conductors from 6 mm² up to 70 mm², which covers the full range from moderate motor loads up to heavy feeders where larger cable cross-sections are required for voltage drop or ampacity. The magnet coil uses screw-type terminals, which are field-serviceable and accept standard screwdriver termination without special tooling.

Operating conditions and endurance

Arcing time at AC is 10 to 21 ms, with a separate arcing time range of 10 to 20 ms for the main contacts — this narrow window means the contactor clears faults quickly, reducing arc energy on the contacts and extending electrical life.

Auxiliary switching capability

Up to two auxiliary contact blocks can be attached, allowing expansion for additional signaling or interlocking without replacing the base contactor.

Frequently asked questions

What is the maximum conductor size for the main circuit on the 3RT2344-1AL20?

The main circuit terminals accept stranded conductors up to 70 mm², which is suitable for high-current motor feeders or distribution circuits where larger cable cross-sections are required.