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Siemens 3RH2122-2AN20 — Contactors

Siemens SIRIUS 3RH2122-2AN20 Auxiliary Contactor, 2 NO Conta

MPN3RH2122-2AN20
Active

Siemens SIRIUS auxiliary contactor, 3RH2122-2AN20, size S00, 2 NO instantaneous contacts, screw and snap-on mounting on 35 mm DIN rail.

Siemens 3RH2122-2AN20 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RH2122-2AN20 — Identification
ParameterValue
Contactor frame sizeS00
3RH2122-2AN20 — 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
3RH2122-2AN20 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz220 V
3RH2122-2AN20 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH2122-2AN20 — Connection & Mounting
ParameterValue
Conductor cross-section, solid or stranded2x (0,5 ... 4 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 2.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail
3RH2122-2AN20 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH2122-2AN20 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH2122-2AN20 — Mechanical
ParameterValue
Width45 mm
Height70 mm
Depth73 mm
3RH2122-2AN20 — Specifications
ParameterValue
At AC4 ... 15 ms

Product details

The S00 footprint (45 mm wide, 70 mm high, 73 mm deep) is the compact end of the SIRIUS contactor family, sized for control circuits rather than main power switching. Rated for 10 A at both 24 V and 230 V, with a rated insulation voltage of 690 V at 50/60 Hz. The contact rating drops with voltage — 4.7 A at 60 V, 3 A at 110 V and 400 V, 1.2 A at 220 V — so match the load voltage to the right column in the selection table. The 10 A figure at 24 V and 230 V covers most PLC output and relay coil switching duties.

Mounting and spacing

Contact performance and electrical life

Instantaneous contacts rated for 30,000,000 operating cycles typical. Arcing time 10 to 15 ms at AC, 4 to 15 ms at DC. DC switching frequency 10,000 operations per hour.

Relative humidity minimum 10 %. RoHS compliance date of October 1, 2009 is on record.

Frequently asked questions

What is the closest functional alternative — 3RT1016-1AN22?

The 3RT1016-1AN22 is a power contactor, not an auxiliary contactor. It shares the S00 frame size and DIN-rail mounting, but carries main contacts for motor loads rather than auxiliary contacts for control circuits. They are not drop-in replacements: the 3RH2122-2AN20 serves the signal-level switching role, while the 3RT1016-1AN22 handles power switching. If you need auxiliary contacts on a 3RT power contactor, the 3RH2122-2AN20 mounts alongside it as a separate block.

What are the key dimensions for panel layout?

Width 45 mm, height 70 mm, depth 73 mm. Clearance requirements: 10 mm upward, 10 mm forward, 10 mm downward, 6 mm at the sides.

MPN
3RH2122-2AN20