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Siemens 3RH2422-1LB40-0LA0 — Contactors

Siemens 3RH2422-1LB40-0LA0 SIRIUS Auxiliary Contactor, 24 VD

MPN3RH2422-1LB40-0LA0
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Siemens SIRIUS auxiliary contactor, Size S00, 24 VDC coil, 2 NO + 2 NC contacts, screw and snap-on 35 mm DIN rail mounting, 117 mm depth, 90 mm width.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RH2422-1LB40-0LA0 — Identification
ParameterValue
Contactor frame sizeS00
3RH2422-1LB40-0LA0 — 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
3RH2422-1LB40-0LA0 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH2422-1LB40-0LA0 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH2422-1LB40-0LA0 — 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
3RH2422-1LB40-0LA0 — Durability
ParameterValue
Durability (operating cycles, typ.)5 000 000
Durability with aux. switch block (cycles, typ.)5 000 000
3RH2422-1LB40-0LA0 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH2422-1LB40-0LA0 — Mechanical
ParameterValue
Width90 mm
Height57.5 mm
Depth117 mm
3RH2422-1LB40-0LA0 — Specifications
ParameterValue
At AC10 000 1/h

Product details

The coil pulls in at 24 VDC with a closing power of 13 W, and the contact block carries 10 A at 24 V rated value — enough for PLC inputs, relay coils, and indicator lamps in a control panel. A built-in varistor surge suppressor handles the inductive kick from the coil, so you don't need an external flyback diode across the DC coil terminals.

The 10 A rating at 24 V is the headline contact current, but the same contacts also handle 4.7 A at 60 V, 3 A at 110 V, and 1.2 A at 220 V — useful when the auxiliary contactor switches loads at different control voltages in the same cabinet. Mechanical endurance is listed at 5 million operating cycles typical, with a maximum switching frequency of 10,000 operations per hour at AC — that's about one cycle every 360 ms, so it keeps up with fast-cycling machines. Arcing time runs 10 to 15 ms, and the minimum clearance around the contactor is 10 mm upwards, forwards, and downwards, 6 mm at the side — tight enough for dense DIN-rail layouts but leave the vertical gap for arc venting.

Size S00 means the contactor body is 57.5 mm tall, 90 mm wide, and 117 mm deep — a compact footprint that fits alongside S00 contactors and overload relays on the same DIN rail without overhang. The mounting position is flexible: +/-180° rotation on a vertical surface, plus +/-22.5° tilt forward or backward — useful when the panel layout forces an odd angle. Terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm² solid or stranded wire — standard control wiring sizes, no special ferrules needed.

Frequently asked questions

Where can I buy 3RH2422-1LB40-0LA0?

This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time.

What is the closest functional second-source for 3RH2422-1LB40-0LA0?

The 3RH2422-1AB00 is a peer auxiliary contactor in the same SIRIUS Size S00 family, but it uses a 24 VAC/DC coil without a varistor — verify coil type and surge suppression before substituting.

Will 3RH2422-1LB40-0LA0 drop into a panel specified around 3RH2422-1AB00?

Yes, both are Size S00 with the same screw and snap-on 35 mm DIN rail mounting, same 57.5 x 90 x 117 mm footprint, and same terminal wiring range. The main difference is the coil: the -1LB40-0LA0 has a 24 VDC coil with a built-in varistor, while the -1AB00 uses a 24 VAC/DC coil without one.

MPN
3RH2422-1LB40-0LA0