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Siemens 3RH1140-1BW40 — Contactors

Siemens 3RH1140-1BW40 SIRIUS Auxiliary Contactor, 4 NO, 48 V

MPN3RH1140-1BW40

Siemens SIRIUS auxiliary contactor, size S00, 3RH1140-1BW40, 4 NO contacts, 48 V DC coil, screw and snap-on mounting, IP20 front.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
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Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RH1140-1BW40 — Identification
ParameterValue
Contactor frame sizeS00
3RH1140-1BW40 — 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
3RH1140-1BW40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH1140-1BW40 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1140-1BW40 — 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
3RH1140-1BW40 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH1140-1BW40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH1140-1BW40 — Mechanical
ParameterValue
Width45 mm
Height57.5 mm
Depth72 mm

Product details

The screw and snap-on mounting fits standard DIN rail; the IP20 front face protects against tool probes in an enclosed panel.

The four NO contacts are rated for AC switching at several voltage levels: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V. For DC control circuits, the contacts carry 1 A at 110 V and 0.27 A at 220 V. These are the thermal current ratings — derate if you are switching inductive loads or running multiple contacts in series.

Coil and environmental limits

The DC coil draws 3.2 W both during pickup and hold — no power drop after closure, so factor that into your 24 VDC supply budget if the contactor is held continuously. The unit withstands 6 kV surge voltage, which covers most installation categories up to 300 V phase-to-earth.

Wiring and mechanical fit

Terminals accept solid conductors: two wires of 0.5–1.5 mm², two of 0.75–2.5 mm², or a single 4 mm² per clamp. The 45 mm width, 57.5 mm height, and 72 mm depth match the SIRIUS S00 footprint — it occupies one standard 45 mm module on a DIN rail. Shock resistance is rated at 10g for 5 ms and 5g for 10 ms.

Frequently asked questions

What are the key ratings of 3RH1140-1BW40?

Four NO contacts rated 10 A at 24 V AC, 6 A at 230 V, 3 A at 400 V; DC coil 48 V, 3.2 W; size S00; IP20 front; screw/snap-on DIN-rail mount.

Where can I buy 3RH1140-1BW40?

We source and quote this part to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

MPN
3RH1140-1BW40