Siemens SIRIUS 3RH21 4-pole contactor relay with DC coil, available for 24, 110 and 220 V DC control voltage with 4 NO, 3 NO + 1 NC and 2 NO + 2 NC contacts. Versions with a factory-integrated diode are available for 24 V DC.
Technical data
| Size | S00 |
|---|---|
| Mounting | Screw or snap-on mounting on TH35 DIN rail |
| Connection | Screw (box) or spring-loaded terminals, depending on article number |
| Standards | IEC 60947-1, IEC 60947-4-1, IEC 60947-5-1 |
| Contacts | 4 (basic unit) |
| Rated operational current Ie/AC-15 at 230 V | 10 A |
| Coil | DC, 24 / 110 / 220 V |
| Coil circuit | Standard or integrated diode (24 V DC) |
| Force-guided contacts | Yes (IEC 60947-5-1 Annex L) |
Article numbers
| Contacts | Uc (V DC) | Coil circuit | Screw terminals | Spring-loaded terminals |
|---|---|---|---|---|
| 4 NO | 24 | – | 3RH2140-1BB40 | 3RH2140-2BB40 |
| 4 NO | 110 | – | 3RH2140-1BF40 | 3RH2140-2BF40 |
| 4 NO | 220 | – | 3RH2140-1BM40 | 3RH2140-2BM40 |
| 3 NO + 1 NC | 24 | – | 3RH2131-1BB40 | 3RH2131-2BB40 |
| 3 NO + 1 NC | 110 | – | 3RH2131-1BF40 | 3RH2131-2BF40 |
| 3 NO + 1 NC | 220 | – | 3RH2131-1BM40 | 3RH2131-2BM40 |
| 2 NO + 2 NC | 24 | – | 3RH2122-1BB40 | 3RH2122-2BB40 |
| 2 NO + 2 NC | 110 | – | 3RH2122-1BF40 | 3RH2122-2BF40 |
| 2 NO + 2 NC | 220 | – | 3RH2122-1BM40 | 3RH2122-2BM40 |
| 4 NO | 24 | Integrated diode | 3RH2140-1FB40 | 3RH2140-2FB40 |
| 3 NO + 1 NC | 24 | Integrated diode | 3RH2131-1FB40 | 3RH2131-2FB40 |
| 2 NO + 2 NC | 24 | Integrated diode | 3RH2122-1FB40 | 3RH2122-2FB40 |
Technical data and article numbers are based on Siemens catalog IC 10 · 2026 (chapter 5, SIRIUS 3RH2 contactor relays) and are for information only. Image is representative. Coil voltages not listed in the table are available on request according to the Siemens catalog.
For price, stock and lead time, use the Request a Quote button or call +90 533 945 27 94. Sending the article number from the table is enough.
Tags: 3RH21 DC, Siemens contactor relay, auxiliary contactor, SIRIUS 3RH2, 3RH2140-1BB40, 3RH2140-2BB40, 3RH2140-1BF40, 3RH2140-2BF40, 3RH2140-1BM40, 3RH2140-2BM40, 3RH2131-1BB40, 3RH2131-2BB40, 3RH2131-1BF40, 3RH2131-2BF40, 3RH2131-1BM40, 3RH2131-2BM40, 3RH2122-1BB40, 3RH2122-2BB40, 3RH2122-1BF40, 3RH2122-2BF40, 3RH2122-1BM40, 3RH2122-2BM40, 3RH2140-1FB40, 3RH2140-2FB40, 3RH2131-1FB40, 3RH2131-2FB40, 3RH2122-1FB40, 3RH2122-2FB40