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Siemens 3RH1344-1BG40 — Contactors

Siemens 3RH1344-1BG40 SIRIUS Auxiliary Contactor, 4 NO, S00,

MPN3RH1344-1BG40

Siemens SIRIUS auxiliary contactor, 3RH1344-1BG40, 4 NO instantaneous contacts, size S00, 45 mm width, 10 A at 24 V rated value, screw and snap-on mounting, IP20 front protection.

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Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RH1344-1BG40 — Identification
ParameterValue
Contactor frame sizeS00
3RH1344-1BG40 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
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
3RH1344-1BG40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH1344-1BG40 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1344-1BG40 — 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)
Mounting methodscrew and snap-on mounting
3RH1344-1BG40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
3RH1344-1BG40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH1344-1BG40 — Mechanical
ParameterValue
Width45 mm
Height57.5 mm
Depth111 mm

Product details

It carries 4 normally-open instantaneous contacts, meaning it closes the circuit the moment the coil is energized, with no built-in delay. At 230 V the rating drops to 6 A, and at 400 V it's 3 A — the thermal curve follows the standard IEC 60947-5-1 derating for auxiliary contacts. The 6 kV rated surge voltage resistance means it can sit on the same panel as drives and switching supplies without flashover on transient events.

At 45 mm wide and 57.5 mm tall, it occupies a single modular slot — the same footprint as the S00 contactor frame it's designed to companion. Depth is 111 mm, which includes the coil terminals and contact screws; plan for that plus finger space when laying out the gland plate.

Shock resistance is tested at 10 g for 5 ms and 5 g for 10 ms — enough for machine-mounted applications near presses or conveyors. That's the standard industrial pollution severity for an enclosed panel — no special conformal coating needed for the contactor itself.

Coil and switching details

The DC magnet coil draws 3.2 W both at pickup and hold — no power drop after closure, which is typical for DC-operated contactors. That 3.2 W load needs to be factored into the PLC output or relay driving it; a 24 VDC output card with a 0.5 A per channel rating can drive several of these in parallel, but check the total current budget. For gold-flashed or bifurcated contacts you'd see better, but for a standard silver-alloy contact this is a solid figure for PLC input sensing or low-current interlock circuits.

Frequently asked questions

What is the closest functional second-source to 3RH1344-1BG40?

The closest functional peer in the SIRIUS family is the 3RT1015-1BB42, which is a main contactor rather than an auxiliary contactor. The 3RH1344-1BG40 is specifically an auxiliary contactor with 4 NO contacts, while the 3RT1015-1BB42 is a main contactor with its own auxiliary block. They share the S00 frame size and 45 mm width, so the 3RH1344-1BG40 can be mounted alongside or as a companion to the 3RT1015-1BB42 on the same DIN rail. For a pure auxiliary contactor replacement, the 3RH1344-1BG40 is the direct fit.

What is the depth of the 3RH1344-1BG40?

The depth is 111 mm, measured from the mounting surface to the furthest protruding point (typically the screw terminals). This is standard for the S00 frame size auxiliary contactors.

What wire sizes does the 3RH1344-1BG40 accept?

The terminals accept solid conductors in these combinations: 2x 0.5 to 1.5 mm², 2x 0.75 to 2.5 mm², or 2x 4 mm². This allows daisy-chaining of two conductors per terminal for the smaller sizes.

Will 3RH1344-1BG40 drop into a panel specified around 3RT1015-1BB42?

Yes, the 3RH1344-1BG40 shares the same S00 frame size and 45 mm width as the 3RT1015-1BB42. It mounts on the same 35 mm DIN rail and uses the same screw and snap-on fastening method. The depth is also comparable at 111 mm. No rewiring of the DIN rail or mounting plate is needed.

What compliance documentation does Siemens provide for 3RH1344-1BG40?

The part is RoHS compliant with a substance prohibition date of July 1, 2006. The IP20 front protection rating is declared. The product carries a 6 kV rated surge voltage resistance, indicating it meets IEC 60947-5-1 requirements for auxiliary contactors. The pollution degree is rated 3 per IEC standards.

MPN
3RH1344-1BG40