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Siemens 3RH2122-4BB40-ZX95 — Contactors

Siemens 3RH2122-4BB40-ZX95 SIRIUS Auxiliary Contactor

MPN3RH2122-4BB40-ZX95

Siemens SIRIUS 3RH2122-4BB40-ZX95 auxiliary contactor, size S00, 24 VDC coil, 10 A rated current, 2 NO contacts, screw and snap-on mounting on 35 mm DIN rail.

Siemens 3RH2122-4BB40-ZX95 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RH2122-4BB40-ZX95 — Identification
ParameterValue
Contactor frame sizeS00
3RH2122-4BB40-ZX95 — 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 V10 A
Rated value @ 24 V10 A
Rated value @ 60 V4.7 A
Rated value @ 110 V3 A
Rated value @ 220 V1.2 A
3RH2122-4BB40-ZX95 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH2122-4BB40-ZX95 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH2122-4BB40-ZX95 — Connection & Mounting
ParameterValue
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail
3RH2122-4BB40-ZX95 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH2122-4BB40-ZX95 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH2122-4BB40-ZX95 — Mechanical
ParameterValue
Width45 mm
Height57.5 mm
Depth73 mm
3RH2122-4BB40-ZX95 — Specifications
ParameterValue
At AC10 000 1/h

Product details

DC switching capacity for control circuits

The 3RH2122-4BB40-ZX95 is a SIRIUS auxiliary contactor, size S00, designed for switching control loads in automation panels. It carries two normally-open instantaneous contacts and is rated for a 24 VDC coil. Surge voltage resistance is rated at 6 kV, which meets the overvoltage category III requirements for industrial control circuits per IEC 60947-5-1.

DIN rail fit and clearance zones

Pollution degree 3 means it's suitable for conductive environments typical in industrial enclosures without climate control.

Frequently asked questions

What is the DC switching capacity at 24 V for 3RH2122-4BB40-ZX95?

This is the highest DC current rating across its voltage table — at 440 VDC the rating drops to 0.5 A.

What clearance is needed around this contactor in the panel?

These ensure adequate arc quenching and heat dissipation.

MPN
3RH2122-4BB40-ZX95