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Siemens 3RH1140-1BF40 — Contactors

Siemens 3RH1140-1BF40 SIRIUS Auxiliary Contactor, 4 NO, 110

MPN3RH1140-1BF40

Siemens SIRIUS auxiliary contactor, size S00, 4 NO instantaneous contacts, 110 V DC coil, screw and snap-on mounting, IP20 front protection.

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

3RH1140-1BF40 — Identification
ParameterValue
Contactor frame sizeS00
3RH1140-1BF40 — 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
3RH1140-1BF40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH1140-1BF40 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1140-1BF40 — 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
3RH1140-1BF40 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH1140-1BF40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH1140-1BF40 — Mechanical
ParameterValue
Width45 mm
Height57.5 mm
Depth72 mm

Product details

The coil is rated 110 V DC with a pick-up threshold of 0.8 x rated voltage and a drop-out threshold of 1.1 x rated voltage; closing and holding power are both 3.2 W DC.

The contact ratings are given per IEC utilization category, not a single blanket current. At 24 V the contacts carry 10 A; at 110 V the rating drops to 1 A. At 230 V AC the rating is 6 A, at 400 V it is 3 A, at 500 V it is 2 A, and at 690 V it is 1 A. The 220 V DC rating is 0.27 A. These are the thermal continuous currents at the respective voltages — the actual switching capacity for inductive loads will be lower and should be verified against the load's inrush and time constant.

Fastening is by screw or snap-on mounting onto a DIN rail. The size S00 footprint measures 45 mm wide, 57.5 mm high, and 72 mm deep.

Environmental limits and mechanical endurance

The contactor withstands shock at 10g for 5 ms and 5g for 10 ms. The rated surge voltage withstand is 6 kV, which aligns with overvoltage category III for 300 V AC systems.

The solid conductor termination accepts 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm². This covers the common control wiring gauges for auxiliary circuits.

Frequently asked questions

Where can I buy 3RH1140-1BF40 and what is the lead time?

This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time; no stock count or lead-time figures are published here.

What is 3RH1140-1BF40's contact configuration?

It has four normally-open instantaneous contacts with no delayed, lagging, or make-before-break switching elements. The auxiliary switch extension is supported for adding more contacts.

What compliance documentation does Siemens provide for 3RH1140-1BF40?

The part carries RoHS substance prohibitance compliance dated 01.07.2006. The reference code per IEC 81346-2 is K. Surge voltage resistance is rated at 6 kV, and pollution degree is 3 per IEC 60947-1.

Will 3RH1140-1BF40 drop into a panel specified around 3RH2140-1BP40?

Both are size S00 SIRIUS auxiliary contactors with the same 45 mm width, so the DIN-rail footprint and panel cutout are identical. The difference is in coil voltage and contact arrangement — verify the coil voltage (110 V DC here) and the NO/NC count against the original specification before substitution.

MPN
3RH1140-1BF40