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Siemens 3RH1344-2BW40 — Contactors

3RH1344-2BW40 SIRIUS Auxiliary Contactor, 4 NO, 24 VDC, S00

MPN3RH1344-2BW40

Siemens SIRIUS auxiliary contactor, size S00, 3RH1344-2BW40, 4 NO contacts, 24 VDC coil, 45 mm width, screw and snap-on mounting.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RH1344-2BW40 — Identification
ParameterValue
Contactor frame sizeS00
3RH1344-2BW40 — Ratings & Performance
ParameterValue
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 @ 110 V1 A
Rated value @ 220 V0.27 A
3RH1344-2BW40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH1344-2BW40 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1344-2BW40 — Protection & Coordination
ParameterValue
Aux. switch short-circuit protection, fusefuse gL/gG: 10 A
3RH1344-2BW40 — Connection & Mounting
ParameterValue
Conductor cross-section, solid2x (0.25 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.25 ... 1.5 mm²)
3RH1344-2BW40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
3RH1344-2BW40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
3RH1344-2BW40 — Mechanical
ParameterValue
Width45 mm
Height60 mm
Depth114 mm

Product details

It belongs to the SIRIUS family, size S00, which is the compact footprint for control loads up to around 10 A. Four normally-open instantaneous contacts give you four independent signal paths; no auxiliary switch, no delayed or make-before-break options on this variant.

The headline rating is 10 A at AC-12, which covers resistive control loads like relay coils, indicator lamps, and PLC inputs. For inductive or motorised loads the contacts derate: 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, 1 A at 690 V. On DC switching the numbers drop faster — 10 A at 24 V, 1 A at 110 V, 0.27 A at 220 V — because DC arcs don't self-extinguish at zero-crossing. Shock resistance is 10g / 5 ms and 5g / 10 ms, meaning it holds contact continuity under moderate machine vibration but not heavy impact.

Frequently asked questions

What is the switching capacity of 3RH1344-2BW40 at different voltages?

At AC-12 (resistive loads) it's rated 10 A. For inductive AC loads: 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, 1 A at 690 V. For DC loads: 10 A at 24 V, 1 A at 110 V, 0.27 A at 220 V.

What wire size does the 3RH1344-2BW40 accept?

The screw terminals accept 2x (0.25 to 2.5 mm²) solid or stranded conductors per clamp.

Where can I buy 3RH1344-2BW40?

This part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

Does 3RH1344-2BW40 have any delayed or make-before-break contacts?

No. All four contacts are instantaneous normally-open. There are no delayed, lagging, or make-before-break contacts on this variant.

MPN
3RH1344-2BW40