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Siemens 3RH1140-2KB40 — Contactors

Siemens SIRIUS 3RH1140-2KB40 Coupling Relay, 24 VDC, 4 NO, 1

MPN3RH1140-2KB40

Siemens SIRIUS coupling relay, 3RH1140-2KB40, 4 NO contacts, 24 VDC coil, 10 A at 24 V, screw and snap-on mounting, size S00, IP20.

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

3RH1140-2KB40 — Identification
ParameterValue
Contactor frame sizeS00
3RH1140-2KB40 — Ratings & Performance
ParameterValue
Rated value @ 24 V10 A
Rated value @ 110 V1 A
Rated value @ 220 V0.27 A
3RH1140-2KB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH1140-2KB40 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1140-2KB40 — Protection & Coordination
ParameterValue
Aux. switch short-circuit protection, fusefuse gL/gG: 10 A
3RH1140-2KB40 — Connection & Mounting
ParameterValue
Conductor cross-section, solid2x (0.25 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.25 ... 1.5 mm²)
3RH1140-2KB40 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
3RH1140-2KB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH1140-2KB40 — Mechanical
ParameterValue
Width45 mm
Height60 mm
Depth73 mm

Product details

The Siemens SIRIUS 3RH1140-2KB40 is a coupling relay for switching auxiliary circuits, carrying 4 instantaneous NO contacts rated at 10 A at 24 V (AC-12 maximum). No auxiliary switch or delayed/make-before-break switching is built in; this is a straight four-pole normally-open relay for signal-level or low-power load isolation.

Environmental and isolation

Shock resistance is specified at 10g / 5 ms and 5g / 10 ms — adequate for panel-mounted equipment in industrial machinery subject to intermittent vibration.

Wiring and suppression

Terminals accept solid conductors from 0.25 to 2.5 mm² (2x per clamp) and finely stranded with ferrule from 0.25 to 1.5 mm². A built-in varistor provides surge suppression across the coil — no external snubber needed for standard 24 VDC switching, though verify polarity if the circuit includes free-wheeling diodes elsewhere.

Frequently asked questions

What is the closest functional alternative to 3RH1140-2KB40?

Within the SIRIUS contactor family, the 3RT1016-1BB42 is a contactor rather than a coupling relay, so it carries a different duty rating and coil configuration. The 3RH1140-2KB40 is a dedicated auxiliary-circuit coupling relay with 4 NO contacts; a contactor sibling like 3RT1016-1BB42 serves main power switching and would not be a direct drop-in without rewiring. If you need a functional second-source within the same size S00 footprint, verify the contact count and coil voltage match your circuit before substituting.

How do I get current pricing and availability for 3RH1140-2KB40?

Submit an RFQ through this listing. The part is sourced to order through independent distribution; availability and current pricing are confirmed at quote time, not published here.

What is 3RH1140-2KB40's listed depth?

73 mm. Combined with a width of 45 mm and height of 60 mm, the size S00 envelope fits standard DIN-rail panels.

MPN
3RH1140-2KB40