Siemens 3RV20314KA10 Class 10 Motor Starter Protector
Risk-ordered trade-offs for the MSP S2 62–73 A breaker
- Thermal-only overload vs. thermal-magnetic type: This unit carries a "Thermal" breaker classification. Some alternates in the same series (e.g., 3RV20314KA15 and 3RV20314RA10) specify "Thermal Magnetic," which adds short-circuit magnetic protection in a single device. The thermal-only design requires coordination with a separate upstream short-circuit device.
- Class 10 tripping characteristic vs. higher overload classes: Class 10 denotes trip times suitable for typical industrial motor heating curves, but does not accommodate high-inertia loads or motors requiring longer start times. Class 20 or Class 30 alternates would be needed for those cases.
- Bulk encapsulation vs. box packaging: The seed ships in bulk; several alternates (3RV20314KA15, 3RV20314RA10) use box packaging, which may aid individual unit traceability and simplify storage in low-volume panel builds.
- Hazardous-location approval scope: ATEX, CCC, CSA, EAC, and UL are listed; note the slight variation across the family. Some alternates add CE, IECEx, and VDE certifications. Applications requiring IECEx or VDE should confirm the specific MPN covers those marks.
- 73 A max rating at 3-pole DIN Rail: The 73 A rating at three poles places this toward the upper end of the S2 size class. Panel thermal density and DIN Rail loading increase proportionally; verify adjacent devices do not create localized derating conditions.
Thermal-magnetic breaker specifications
| Spec | Value |
|---|---|
| Actuator Type | Rotary |
| Breaker Type | Thermal (Class 10) |
| Current Rating | 62–73 A (adjustable range) |
| Number of Poles | 3 |
| Mounting Type | DIN Rail |
| Illumination | None |
| Mfr | Siemens |
| Product Status | Active |
The thermal element provides inverse-time overload protection aligned with motor heating curves. The rotary actuator supports manual reset and local isolation without removal from the DIN Rail.
Mechanical and approval details
The S2 frame size and three-pole layout determine the panel cutout and DIN Rail clearance footprint. Siemens defines the S2 as mid-size within the 3RV2 family; confirm enclosure space against the published face-to-face and height dimensions for the series. Mounting is standard DIN Rail (35 mm); no special bus-bar or panel adapters are required unless specified by the project specification.
Approval coverage includes ATEX (Explosive Atmospheres), CCC (China), CSA (Canada/US), EAC (Eurasian), and UL (United States). This combination supports most industrial markets. The absence of IECEx on the seed record is a distinction from several alternates; confirm whether IECEx is required for the target installation geography.
Family sizing context
The S2 series covers a continuous current span from approximately 22 A to 80 A across the full family, partitioned by letter codes in the MPN suffix. The seed covers 62–73 A (K suffix). Adjacent alternatives:
| MPN | Current Range (A) | Thermal Type |
|---|---|---|
| 3RV20314EA10 | 22–32 | Thermal |
| 3RV20314UA10 | 32–40 | Thermal |
| 3RV20314VA10 | 35–45 | Thermal |
| 3RV20314WA10 | 42–52 | Thermal |
| 3RV20314XA10 | 49–59 | Thermal |
| 3RV20314KA10 | 62–73 | Thermal |
| 3RV20314RA10 | 70–80 | Thermal Magnetic |
Readers must qualify alternates independently for specific project requirements; similarity scores do not substitute for formal selection.