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Siemens 3RH1140-2BF40 — Contactors

Siemens 3RH1140-2BF40 SIRIUS Auxiliary Contactor, 110 V DC C

MPN3RH1140-2BF40

Siemens SIRIUS auxiliary contactor, size S00, 4 NO + 0 NC, 110 V DC coil, screw and snap-on mounting, IP20 front.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RH1140-2BF40 — Identification
ParameterValue
Contactor frame sizeS00
3RH1140-2BF40 — 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
3RH1140-2BF40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH1140-2BF40 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1140-2BF40 — Connection & Mounting
ParameterValue
Conductor cross-section, solid2x (0.25 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.25 ... 1.5 mm²)
Mounting methodscrew and snap-on mounting
3RH1140-2BF40 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH1140-2BF40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH1140-2BF40 — Mechanical
ParameterValue
Width45 mm
Height60 mm
Depth73 mm

Product details

It carries four normally-open (4 NO) instantaneous contacts with zero delayed, lagging, or make-before-break switching, so every contact closes at the same instant the coil pulls in.

The magnet coil is rated 110 V DC, drawing 3.2 W on both pickup and hold — no power drop after sealing, so the coil dissipation is constant and the supply must be sized for the full 3.2 W continuously. The main contact rating is 10 A at AC-12 (resistive loads up to 400 V), which is the standard auxiliary contactor duty for control transformers, indicator lamps, and PLC digital inputs. At 110 V the contacts are rated 1 A, at 230 V it drops to 6 A, and at 690 V to 1 A — the AC-12 curve is linear with voltage, so for a given load voltage interpolate between these points.

The product extension auxiliary switch is available (field-addable), so the 4 NO base can be expanded with additional contact blocks if the control scheme needs more than four signals.

RoHS compliance date is marked as 07/01/2006. No UL or CSA listing is explicitly stated in the evidence.

Frequently asked questions

What is the 3RH1140-2BF40's coil voltage and power draw?

The coil is rated 110 V DC and draws 3.2 W on both pickup and hold — constant dissipation, no power drop after sealing.

Will 3RH1140-2BF40 drop into a panel specified around 3RH2140-1BP40 without rewiring?

Both are Size S00 auxiliary contactors with the same mounting footprint and terminal spacing, so the mechanical fit is identical. The difference is the contact arrangement: 3RH1140-2BF40 has 4 NO, while the peer has a different NO/NC split — verify your control schematic before swapping.

Where can I buy 3RH1140-2BF40 and how is it quoted?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm offer.

MPN
3RH1140-2BF40