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Siemens 3RH1440-1BB40 — Contactors

Siemens SIRIUS 3RH1440-1BB40 Auxiliary Contactor, 24 V DC, 4

MPN3RH1440-1BB40

Siemens SIRIUS auxiliary contactor, 3RH1440-1BB40, Size S00, 24 V DC coil, 4 NO instantaneous contacts, screw and snap-on mounting, IP20 front protection.

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

Specifications

3RH1440-1BB40 — Identification
ParameterValue
Contactor frame sizeS00
3RH1440-1BB40 — 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
3RH1440-1BB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH1440-1BB40 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1440-1BB40 — 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)
Mounting methodscrew and snap-on mounting
3RH1440-1BB40 — Durability
ParameterValue
Durability (operating cycles, typ.)5 000 000
Durability with aux. switch block (cycles, typ.)5 000 000
3RH1440-1BB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH1440-1BB40 — Mechanical
ParameterValue
Width90 mm
Height57.5 mm
Depth72 mm

Product details

Coil voltage is 24 V DC, pulling 3.2 W on pickup and holding at the same 3.2 W — a steady-state draw that won't overheat a crowded DIN rail. The magnet coil's closing and holding power are identical, so no inrush spike to worry about on the control transformer.

The S00 body is compact at 72 mm deep, 90 mm wide, and 57.5 mm tall — fits in tight panel layouts. Terminals accept solid conductors: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², and 2x 4 mm². That covers most control wiring from 18 AWG up to 12 AWG.

Environmental and electrical durability

Shock resistance is 10g for 5 ms and 5g for 10 ms; good for machinery with moderate vibration, though you'd still want to avoid mounting it directly on a hammer mill. Mechanical life is 5 million operations typical.

Frequently asked questions

Where can I buy 3RH1440-1BB40 and how do I get a price?

This part is sourced to order against an RFQ through independent distribution. Submit a quote request; availability and current pricing are confirmed at quote time.

What is 3RH1440-1BB40's listed depth (72 mm) on this component line?

The depth is 72 mm, with a width of 90 mm and height of 57.5 mm — a compact S00 footprint that fits standard DIN-rail enclosures.

What is 3RH1440-1BB40's listed solid wire range?

It accepts 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², and 2x 4 mm² solid conductors — covering 18 AWG through 12 AWG control wiring.

Will 3RH1440-1BB40 drop into a panel that was specified around 3RH2140-1BP40 without rewiring?

The 3RH1440-1BB40 is a Size S00 auxiliary contactor with 4 NO contacts; the 3RH2140-1BP40 is a different variant. Both share the S00 footprint and DIN-rail mounting, but terminal assignments and coil voltage may differ — verify the wiring diagram before swapping.

What compliance documentation does this brand provide for 3RH1440-1BB40 (RoHS, REACH, UL, IEC)?

The part carries a substance prohibition date of 01.07.2006, aligning with RoHS compliance. It is designed to IEC 60947 standards. For specific UL, CSA, or REACH declarations, request the manufacturer's compliance documentation with your RFQ.

MPN
3RH1440-1BB40