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Siemens 3RH1440-1BM40 — Contactors

Siemens SIRIUS 3RH1440-1BM40 Auxiliary Contactor, Size S00,

MPN3RH1440-1BM40

Siemens SIRIUS auxiliary contactor, size S00, 3RH1440-1BM40, 4 NO instantaneous contacts, 220 V DC coil, screw and snap-on mounting, IP20 front protection.

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

Specifications

3RH1440-1BM40 — Identification
ParameterValue
Contactor frame sizeS00
3RH1440-1BM40 — 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
3RH1440-1BM40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH1440-1BM40 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1440-1BM40 — 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
3RH1440-1BM40 — Durability
ParameterValue
Durability (operating cycles, typ.)5 000 000
Durability with aux. switch block (cycles, typ.)5 000 000
3RH1440-1BM40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH1440-1BM40 — Mechanical
ParameterValue
Width90 mm
Height57.5 mm
Depth72 mm

Product details

It is designed for signal switching and control-circuit isolation within motor starter assemblies and general control panels, not for direct motor load switching.

Contact configuration and switching capacity

Four instantaneous NO contacts, no delayed or lagging switching, no make-before-break. Rated operational current at 24 V is 10 A, derating to 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V. The 220 V DC coil draws 3.2 W closing and holding — no power reduction after pick-up, so factor that into DC supply sizing.

Mounting and environmental tolerance

Fastens via screw or snaps onto DIN rail. IP20 on the front, so it belongs inside a cabinet, not exposed to washdown. Shock rated at 10g / 5 ms and 5g / 10 ms.

Isolation and compliance

Contact reliability: one incorrect operation per 100 million switching cycles at 17 V, 1 mA. RoHS compliance date set to July 1, 2006, covering the substance prohibitions. The lifecycle is listed as current production.

Frequently asked questions

Will 3RH1440-1BM40 drop into a panel specified around 3RH2140-1BP40 without rewiring?

Both are size S00 auxiliary contactors with screw/snap-on mounting and the same basic footprint, so mechanical fit is identical. The key difference is contact arrangement: 3RH1440-1BM40 carries four NO contacts, while 3RH2140-1BP40 has two NO and two NC. Verify your control logic requires four NO before substituting.

MPN
3RH1440-1BM40