Siemens 3RV20214BA15 Motor Starter Protector
In a motor feeder branch, this device sits between the upstream feeder breaker and the motor load, providing thermal overload protection for three-phase motors. The Siemens 3RV20214BA15 is a Size S0 (14–20 A frame) motor starter protector with screw-type main contacts, one normally-open and one normally-closed auxiliary contact, and rotary operating handle.
Engineering Verification Checklist
- Motor full-load current matches the 20 A thermal trip setting
- System voltage is within the device's tested ratings (verify against applicable ATEX, CCC, CSA, EAC, or UL certificate scope)
- ATEX/IECEx rating is required for the intended hazardous area zone classification
- Panel DIN rail clearance accommodates the S0 frame footprint and allows handle rotation
- 1NO + 1NC auxiliary contacts are compatible with the control scheme (start/stop logic, fault signaling, or bus feedback)
- Screw-terminal main contacts are suitable for conductor size and torque specification per installation standard
- Bulk-packaged version is acceptable for the procurement and stock-handling process
- Coordination with upstream short-circuit protection is evaluated for selective tripping behavior
Similar Catalog Parts
Side-by-side catalog screening — peers require the reader's own qualification; this is not an interchange approval.
| Spec | 3RV20214BA15 | 3RV20214BA10 | 3RV20214BA25 | 3RV20214NA15 |
|---|---|---|---|---|
| Current Rating (Amps) | 20A | 20A | 20A | 28A |
| Number of Poles | 3 | 3 | 3 | 3 |
| Mounting Type | DIN Rail | DIN Rail | DIN Rail | DIN Rail |
| Actuator Type | Rotary | Rotary | Rotary | Rotary |
| Breaker Type | Thermal | Thermal | Thermal Magnetic | Thermal Magnetic |
| Approval Agency | ATEX, CCC, CSA, EAC, UL | ATEX, CCC, CSA, EAC, UL | ATEX, CCC, CE, CSA, EAC, IECEx, UL, VDE | ATEX, CCC, CE, CSA, EAC, IECEx, UL, VDE |
| Package | Bulk | Bulk | Box | Box |
| Similarity | — | 1.00 | 1.00 | 1.00 |
3RV20214BA10 — same S0 frame, 20 A thermal trip, and auxiliary contacts are omitted in the title; bulk packaging preserved. Shares identical ATEX/CCC/CSA/EAC/UL approval scope.
3RV20214BA25 — shares the same auxiliary configuration (1NO 1NC) and S0/20 A/3-pole core; spring-loaded main contacts replace screw terminals, and the approval scope broadens to include CE, IECEx, and VDE alongside ATEX/CCC/CSA/EAC/UL.
3RV20214NA15 — same auxiliary contact arrangement and DIN rail mount; the trip rating moves to 28 A within a higher frame, and thermal-magnetic breaking type replaces purely thermal. Expanded CE/IAC/IEx approvals included.