What this breaker does on the line
The Siemens SENTRON 3VA2225-6HL32-0BH0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, with a maximum breaking capacity of 242 kA at 240 VAC. At 415 VAC it still interrupts 187 kA, which means it handles high-fault utility feeds or large transformer secondaries without cascading failure upstream. The design is line protection — intended for main or feeder breaker duty, not motor branch circuit protection. The basic switch variant is 3VA2225-6HL32-0AA0.
That thermal performance means it can sit in a moderately warm enclosure without forced ventilation and still deliver close to nameplate current.
