The contacts are rated across a wide voltage range, which tells you this relay can handle both low-voltage control signals and higher-voltage auxiliary loads. At 24 VDC the contact carries 10 A; at 60 VDC it drops to 4.7 A; at 110 VDC it's 3 A; at 220 VDC it's 1.2 A. On the AC side, at 230 V it's 10 A, at 400 V it's 3 A, at 690 V it's 1 A. These are the maximum currents the contacts can break — the real-world load should stay under these numbers, especially on inductive DC loads where the arc energy is higher. That's fast enough for most interlock and safety circuits, but not a high-speed switching relay — it's built for industrial control duty, not pulse-width modulation.
Siemens SIRIUS 3RH2422-1XB40-0LA2 Contactor Relay, 24-34 VDC
MPN3RH2422-1XB40-0LA2
Siemens SIRIUS 3RH2422-1XB40-0LA2 contactor relay for railway applications, 24-34 VDC coil, 4 W pick-up power, size S00, screw and snap-on mounting onto 35 mm standard mounting rail.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Contactor frame size | S00 |
| Parameter | Value |
|---|---|
| Rated operational current, AC-12, max. | 10 A |
| Rated value @ 400 V | 3 A |
| Rated value @ 500 V | 2 A |
| Rated value @ 690 V | 1 A |
| Rated value @ 230 V | 10 A |
| Rated value @ 24 V | 10 A |
| Rated value @ 60 V | 4.7 A |
| Rated value @ 110 V | 3 A |
| Rated value @ 220 V | 1.2 A |
| Parameter | Value |
|---|---|
| Control supply voltage type | DC |
| Parameter | Value |
|---|---|
| Auxiliary contact reliability | 1 faulty switching per 100 million (17 V, 1 mA) |
| Parameter | Value |
|---|---|
| Conductor cross-section, solid or stranded | 2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm² |
| Conductor cross-section, finely stranded w/ ferrule | 2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²) |
| Mounting method | screw and snap-on mounting onto 35 mm standard mounting rail |
| Side-by-side mounting | Yes |
| Parameter | Value |
|---|---|
| Durability (operating cycles, typ.) | 30 000 000 |
| Durability with aux. switch block (cycles, typ.) | 10 000 000 |
| Parameter | Value |
|---|---|
| Operating temperature range | -40 ... +70 °C |
| Storage temperature range | -55 ... +80 °C |
| Installation altitude, max. | 2 000 m |
| Parameter | Value |
|---|---|
| Width | 90 mm |
| Height | 58 mm |
| Depth | 73 mm |
Product details
Frequently asked questions
Will 3RH2422-1XB40-0LA2 drop into a panel that was specified around 3RH2122-1BA40 without rewiring?
Both are size S00 contactor relays on the same SIRIUS platform, so the mounting footprint and DIN-rail clip are identical. The main difference is the coil voltage: the 3RH2422-1XB40-0LA2 runs on 24-34 VDC, while the 3RH2122-1BA40 is a different coil variant. If your panel's control voltage matches 24-34 VDC, it will drop in without rewiring the mounting or the auxiliary contacts.
MPN
3RH2422-1XB40-0LA2