The Siemens SENTRON 3VA2063-8KP46-0AA0 is a 4-pole molded case circuit breaker rated for 63 A continuous current (Iu) with no derating across its full ambient range from 40 °C to 70 °C — a solid thermal performance that simplifies panel design when you're packing breakers into a warm enclosure. Breaking capacity is the headline here: 440 kA at 240 V, 330 kA at 415/440 V, 220 kA at 500 V, and still 52.5 kA at 690 V. That's serious fault-current headroom for a 63 A frame — this breaker sits comfortably in high-SCCR industrial distribution where you need selectivity downstream of a large transformer or generator. The electronic ETU850 overcurrent release gives you adjustable protection curves (L, S, I, G) with communication capability onboard, so it integrates into a monitored power distribution scheme without an add-on module.
Front IP40 rating means it's protected against tool probes and wire debris during panel wiring, but keep it inside a sealed enclosure for washdown or outdoor environments. Power loss is 3 W max. Handles cold warehouses and hot switchrooms without issue.