Siemens 3RV20211JA10 Motor Starter Protector
These 3-pole thermal-only devices mount directly in motor feeder circuits downstream of a contactor, occupying one DIN rail module slot per unit.
The thermal element responds to sustained overcurrent by tripping the rotary-operated mechanism; no short-circuit magnetic function is provided—the upstream branch protection must clear fault currents independently.
Siemens 3RV20211JA10 vs. Comparable Siemens 3RV20211 Family Members
The table below compares shared specifications across the primary part and its catalog siblings. Ratings must be qualified independently for any given application; numeric similarity does not imply interchangeability.
| Spec | 3RV20211JA10 | 3RV20211JA15 | 3RV20211JA20 | 3RV20211FA10 | 3RV20211KA10 |
|---|---|---|---|---|---|
| Current Rating | 10A | 10A | 10A | 5A | 12.5A |
| Poles | 3 | 3 | 3 | 3 | 3 |
| Mount | DIN Rail | DIN Rail | DIN Rail | DIN Rail | DIN Rail |
| Breaker Type | Thermal | Thermal Magnetic | Thermal Magnetic | Thermal | Thermal |
| Actuator | Rotary | Rotary | Rotary | Rotary | Rotary |
| Illumination | None | None | None | None | None |
| Similarity | — | 1.0 | 1.0 | 1.0 | 1.0 |
- 3RV20211JA15 carries the same 10A thermal-magnetic rating in a box package and adds ATEX and VDE approvals absent from the seed listing.
- 3RV20211JA20 shares the 10A thermal-magnetic configuration but uses spring-clamp terminations instead of screw terminals.
- 3RV20211FA10 targets the 3.5–5A adjustment band; the lower current band narrows the feeder flexibility but keeps bulk packaging and basic thermal-only tripping.
- 3RV20211KA10 addresses the adjacent 9–12.5A band; the higher current ceiling makes it unsuitable for circuits where 10A protection is mandated, but it shares the bulk packaging and basic approval set.
Engineering Verification Checklist
- Confirm feeder conductor size matches 10A thermal trip calibration and applicable local wiring rules.
- Verify upstream short-circuit protective device coordinate with thermal-only breaker characteristic.
- Validate that DIN rail enclosure provides adequate ventilation for continuous 10A thermal dissipation.
- Check that rotary actuator orientation suits intended operator reach and panel layout.
- Confirm CCC, CSA, EAC, IECEx, and UL certifications cover the installation jurisdiction.
- Verify load type is non-inductive or that the 7–10A adjustment band accommodates inrush without nuisance trips.
- Ensure bulk packaging quantity aligns with stocking and replacement practices.