The Siemens SENTRON 3VA2325-7MN32-0BJ0 is a molded case circuit breaker (MCCB) designed for motor protection, rated at 250 A continuously across the full 40 °C to 70 °C ambient range — no derating needed up to that ceiling. That flat thermal curve simplifies panel sizing in warm enclosures or crowded cabinets where other breakers would force a larger frame.
Breaking capacity and selectivity
Rated 330 kA at 240 V and 242 kA at 415 V, this MCCB handles high-fault utility feeds or transformer secondaries without cascading upstream. At 690 V the breaking capacity drops to 7.5 kA — still adequate for most 690 V motor branch circuits, but verify coordination if the fault current exceeds that level.
Motor protection and auxiliary configuration
Built for motor protection duty with phase-failure detection and an undervoltage release (UVR) integrated. The auxiliary switch block carries two auxiliary switches plus one trip-alarm switch (HP type), giving the PLC or safety relay a dedicated signal on fault — no extra wiring for a separate alarm contact.
