The 2 NO contacts are rated across a wide voltage range. At 400 V AC the contact carries 10 A, at 230 V AC also 10 A, and at 690 V AC it carries 1 A. For DC switching, at 24 V rated value it handles 10 A, dropping to 0.26 A at 600 V. The DC ratings are lower because DC arcs are harder to extinguish; the 7…20 ms arcing time reflects that. If you're switching a 24 V DC solenoid or contactor coil, the 10 A rating gives generous headroom.
Siemens 3RH2122-2LB40-1LA0 SIRIUS Auxiliary Contactor, 24 VD
MPN3RH2122-2LB40-1LA0
Active
Siemens SIRIUS auxiliary contactor, size S00, 3RH2122-2LB40-1LA0, 24 V DC coil with varistor, 2 NO contacts, screw and snap-on mounting on 35 mm DIN rail.
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 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 ... 4 mm²) |
| Conductor cross-section, finely stranded w/ ferrule | 2x (0.5 ... 2.5 mm²) |
| Mounting method | screw and snap-on mounting onto 35 mm standard mounting rail |
| 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 | 45 mm |
| Height | 70 mm |
| Depth | 116 mm |
| Parameter | Value |
|---|---|
| At AC | 10 000 1/h |
Product details
MPN
3RH2122-2LB40-1LA0