The Siemens SENTRON 3VA2163-8JQ42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 63 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. That flat thermal curve is unusual; most breakers start tapering above 40 °C. The 440 kA breaking capacity at 240 V (330 kA at 415 V, 52.5 kA at 690 V) means this breaker can interrupt fault currents at those levels without welding contacts or cascading failure upstream. Designed for line protection in main distribution panels, it carries communication capability for integration into monitoring systems.
The adjustable thermal-magnetic trip (95 A minimum to 756 A maximum short-circuit release range) allows fine coordination with downstream breakers.