Siemens SIRIUS 3RV2121 size S0 protection device for motor protection, with overload relay function (automatic reset), class 10. Available for rated currents 16–32 A with adjustable thermal overload release and fixed instantaneous (short-circuit) release.
Technical data
| Series | 3RV2121 |
|---|---|
| Size | S0 |
| Application | Motor protection |
| Trip class | 10 |
| Auxiliary switch | none |
| Rated current range | 16–32 A |
| Mounting | Screw or snap-on mounting on TH35 DIN rail |
| Connection | Screw terminals |
| Standard | IEC 60947-2, IEC 60947-4-1 |
Article numbers
| In (A) | Motor rating (kW, 400 V) | Setting range (A) | Instantaneous release (A) | Icu 400 V (kA) | Version | Screw |
|---|---|---|---|---|---|---|
| 16 | 7.5 | 10–16 | 208 | 55 | – | 3RV2121-4AA10 |
| 20 | 7.5 | 13–20 | 260 | 55 | – | 3RV2121-4BA10 |
| 22 | 11 | 16–22 | 286 | 55 | – | 3RV2121-4CA10 |
| 25 | 11 | 18–25 | 325 | 55 | – | 3RV2121-4DA10 |
| 28 | 15 | 23–28 | 364 | 55 | – | 3RV2121-4NA10 |
| 32 | 15 | 27–32 | 400 | 55 | – | 3RV2121-4EA10 |
Motor ratings are guide values for 4-pole standard motors at 50 Hz 400 V AC; the actual starting and rated data of the motor must be considered. Versions for special conditions down to −50 °C have limited mechanical endurance and no UL/CSA, ATEX or IECEx approval (catalog footnote). Auxiliary switches and other accessories are ordered separately.
Technical data and article numbers are based on Siemens catalog IC 10 · 2026 (chapter 7, protection equipment) and are for information only. Image is representative.
For price, stock and lead time, use the Request a Quote button or call +90 533 945 27 94. Sending the article number is enough.
Tags: 3RV2121, siemens motor starter protector, 3RV2, circuit breaker, motor protection, 3RV2121-4AA10, 3RV2121-4BA10, 3RV2121-4CA10, 3RV2121-4DA10, 3RV2121-4NA10, 3RV2121-4EA10