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Siemens 3RH2122-2FW40 — Contactors

Siemens 3RH2122-2FW40 SIRIUS Auxiliary Contactor, S00, 2 NO

MPN3RH2122-2FW40
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Siemens SIRIUS 3RH2122-2FW40 auxiliary contactor, size S00, 2 NO instantaneous contacts, screw and snap-on mounting on 35 mm DIN rail, 45 mm wide, 73 mm deep, 70 mm high.

Siemens 3RH2122-2FW40 datasheet (PDF)
StockContact for availability
Lead timeIn Stock wk
MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

Identification

3RH2122-2FW40 — Identification
ParameterValue
Contactor frame sizeS00

Ratings & Performance

3RH2122-2FW40 — 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

Control & Coil

3RH2122-2FW40 — Control & Coil
ParameterValue
Control supply voltage typeDC

Contacts & Poles

3RH2122-2FW40 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)

Connection & Mounting

3RH2122-2FW40 — 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

Durability

3RH2122-2FW40 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000

Environmental

3RH2122-2FW40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m

Mechanical

3RH2122-2FW40 — Mechanical
ParameterValue
Width45 mm
Height70 mm
Depth73 mm

Specifications

3RH2122-2FW40 — Specifications
ParameterValue
At AC10 000 1/h

Product details

Panel fit and switching capacity

The 3RH2122-2FW40 is a SIRIUS auxiliary contactor in frame size S00 — the smallest Siemens contactor frame, at 45 mm wide, 73 mm deep, and 70 mm high. Clearance distances are tight: 10 mm upwards, forwards, and downwards, with 6 mm at the side.

Wiring and coil details

The coil is DC-operated with a built-in diode surge suppressor — no external flyback diode needed across the coil terminals. Coil closing power at DC is 4 W. Maximum switching frequency is 10,000 cycles per hour at AC, with a DC on-delay of 38 to 65 ms.

Frequently asked questions

What compliance documentation does Siemens provide for 3RH2122-2FW40?

The part carries a substance prohibition date of 10/01/2009, indicating RoHS compliance. The pollution degree 3 rating and operating temperature range support IEC/EN industrial control equipment standards.

MPN
3RH2122-2FW40