MCCB with full-rate thermal stability and high interrupting capacity
The Siemens SENTRON 3VA2163-5HK42-0AA0 is a 4-pole molded case circuit breaker rated for 63 A continuous current, with a full thermal derating curve that holds 63 A from 40 °C through 70 °C — no reduction needed even in a warm cabinet. The interrupting capacity hits 187 kA at 240 V, 121 kA at 415 V and 440 V, 76 kA at 500 V, and 17 kA at 690 V, so it handles high-fault utility feeds or transformer secondaries without cascading upstream. The ETU340 electronic trip unit gives adjustable N-conductor protection (OFF or 100%) and a fixed long-time delay of 1300 ms, which simplifies coordination for line protection duty.