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Siemens 3RH6140-1KB40 — Contactors

Siemens 3RH6140-1KB40 SIRIUS Coupling Relay, 24 V DC, 4 NO

MPN3RH6140-1KB40

Siemens SIRIUS coupling relay, size S00, 24 V DC coil, 4 NO contacts, 6 A rated current, screw terminals, 45 mm width, DIN rail mount.

Siemens 3RH6140-1KB40 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RH6140-1KB40 — Identification
ParameterValue
Contactor frame sizeS00
3RH6140-1KB40 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.6 A
Rated value @ 400 V3 A
Rated value @ 690 V1 A
Rated value @ 230 V10 A
Rated value @ 24 V6 A
Rated value @ 110 V3 A
Rated value @ 220 V1.2 A
3RH6140-1KB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH6140-1KB40 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH6140-1KB40 — Connection & Mounting
ParameterValue
Conductor cross-section, solid or stranded2x (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 onto 35 mm DIN rail
3RH6140-1KB40 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
3RH6140-1KB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH6140-1KB40 — Mechanical
ParameterValue
Width45 mm
Height57.5 mm
Depth73 mm
3RH6140-1KB40 — Specifications
ParameterValue
At AC10 000 1/h

Product details

The Siemens 3RH6140-1KB40 is a SIRIUS coupling relay, size S00, designed for switching auxiliary circuits in control panels. It carries four normally-open (NO) contacts — the "40 E" designation in the order code means 4 NO, zero NC. Rated operational current at AC-12 is 6 A, and at 24 V DC it's also 6 A.

Screw-type terminals accept 2x (0.5 to 1.5 mm²) solid/stranded, 2x (0.75 to 2.5 mm²), or 2x 4 mm². AWG equivalents: 2x (20-16), 2x (18-14), 2x 12. Finely stranded wire with core-end processing: 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²).

Electrical ratings and switching capacity

Maximum installation altitude is 2,000 m above sea level. For DC-12 and DC-13 loads, the maximum operating frequency is 1,000 operations per hour. Rated operational currents at various voltages: 6 A at 24 V, 3 A at 110 V, 1.2 A at 220 V, 10 A at 230 V, 3 A at 400 V, 1 A at 690 V. The surge suppressor is a built-in diode.

Frequently asked questions

Is 3RH6140-1KB40 normally open or normally closed?

The 3RH6140-1KB40 has four normally-open (NO) contacts. The switching element designation "40 E" means 4 NO, zero NC.

What is the difference between 3RH6140-1KB40 and 3RH6140-1BB40?

The 3RH6140-1KB40 has a 24 V DC coil and four NO contacts. The 3RH6140-1BB40 would have a different coil voltage or contact configuration — the order code suffix encodes these differences. For exact specifications of the -1BB40 variant, refer to its own datasheet.

MPN
3RH6140-1KB40