This Siemens SENTRON 3VA2163-5HN36-0KH0 is a 3-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 in a warm panel.
At 240 V it handles 187 kA — that's utility-grade fault current, typical for a main breaker on a large transformer secondary. At 500 V it drops to 75.6 kA, and at 690 V it's down to 3.7 kA — so if you're on a 690 V system, verify your available fault current is under that number or step up to a higher-rated frame.
Physical fit in the panel
At 105 mm wide, 181 mm tall, and 86 mm deep, this 3-pole MCCB fits standard distribution panel cutouts for the SENTRON 3VA frame. Maximum power loss is 4 W — negligible for ventilation planning but worth noting if you're packing a dozen of these in a sealed enclosure.