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Siemens 3RH1344-1BB40 — Contactors

Siemens 3RH1344-1BB40 SIRIUS Auxiliary Contactor, 24 VDC, 4

MPN3RH1344-1BB40

Siemens SIRIUS auxiliary contactor, 3RH1344-1BB40, S00 frame, 24 VDC coil, 4 N/O contacts, 10 A AC-12, 111 mm depth, 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

3RH1344-1BB40 — Identification
ParameterValue
Contactor frame sizeS00
3RH1344-1BB40 — 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
3RH1344-1BB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH1344-1BB40 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1344-1BB40 — Protection & Coordination
ParameterValue
Aux. switch short-circuit protection, fusefuse gL/gG: 10 A
3RH1344-1BB40 — Connection & Mounting
ParameterValue
Conductor cross-section, solid2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
3RH1344-1BB40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
3RH1344-1BB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
3RH1344-1BB40 — Mechanical
ParameterValue
Width45 mm
Height57.5 mm
Depth111 mm

Product details

It carries four normally-open instantaneous contacts and a 24 V DC coil rated at 3.2 W closing and holding power. Rated for 10 A at AC-12 (resistive load), it also handles 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V — covering typical control voltages across global panel builds. The coil holds at 24 VDC nominal; the operating range factor of 0.8 to 1.1 times rated voltage means it picks up reliably down to about 19.2 V and drops out below that threshold. Mounting is screw or snap-on onto DIN rail, with a 45 mm width and 111 mm depth that fits standard S00 contactor footprints. The IP20 front-of-panel protection suits enclosed control cabinets.

Terminals accept solid conductors: 2x 0.5 to 1.5 mm², 2x 0.75 to 2.5 mm², or 2x 4 mm² — covering common panel wire sizes. Shock resistance rated at 10g / 5 ms and 5g / 10 ms. Altitude limit 2,000 m without derating.

Frequently asked questions

How do I get current pricing and availability for 3RH1344-1BB40?

Submit an RFQ — the part is sourced to order through independent distribution, and availability with current pricing is confirmed at quote time.

What is the closest functional second-source for 3RH1344-1BB40?

The 3RT1015-1BB42 is a contactor rather than an auxiliary contactor, so it does not directly drop in as a second-source for the 3RH1344-1BB40's control-circuit switching role.

What is 3RH1344-1BB40's depth?

The depth is 111 mm, with a width of 45 mm and height of 57.5 mm.

What wire sizes does 3RH1344-1BB40 accept?

It accepts solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm².

What compliance documentation does Siemens provide for 3RH1344-1BB40?

The manufacturer provides standard documentation including RoHS and REACH declarations; specific certificates (UL, IEC) are available upon request through the supply channel.

MPN
3RH1344-1BB40