The 3RH2122-2SB40: At 24 V DC it handles 10 A; at 60 V DC it's 4.7 A, and at 110 V DC it's 3 A. The coil is 24 V DC with a built-in suppressor diode, drawing 1.6 W closing power. Pickup voltage is 0.85 of rated (20.4 V), drop-out is 1.85 of rated (44.4 V) — the wide drop-out margin means it holds in during voltage sags that might drop a standard relay.
Siemens 3RH2122-2SB40 SIRIUS Coupling Relay, 10 A at 24 V
MPN3RH2122-2SB40
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Siemens SIRIUS 3RH2122-2SB40 coupling relay, S00 size, 2 NO contacts, 24 V DC coil with suppressor diode, screw and snap-on 35 mm DIN rail mount, 45 x 70 x 73 mm.
Source DocumentedChannel stated on listing & quote
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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 DIN rail |
| Parameter | Value |
|---|---|
| Durability (operating cycles, typ.) | 30 000 000 |
| Parameter | Value |
|---|---|
| Operating temperature range | -25 ... +50 °C |
| Storage temperature range | -55 ... +80 °C |
| Installation altitude, max. | 2 000 m |
| Parameter | Value |
|---|---|
| Width | 45 mm |
| Height | 70 mm |
| Depth | 73 mm |
| Parameter | Value |
|---|---|
| At AC | 10 000 1/h |
Product details
MPN
3RH2122-2SB40