The Siemens SENTRON 3VA1163-6EF32-0JH0 is a 3-pole molded case circuit breaker rated for line protection, carrying 63 A continuously from 40 °C up to 50 °C before any derating kicks in — at 55 °C it still holds 62 A, and at 70 °C it's good for 58 A. That thermal curve means you can pack it into a warm enclosure without losing headroom, as long as you stay under 70 °C operating ambient. Breaking capacity is the headline here: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and still 17 kA up to 690 V. That's a high-interrupting rating for a 63 A frame — it handles fault currents on the secondary side of a large transformer or a high-capacity bus without needing a current-limiting fuse upstream.
Mounting and wiring
Width is 76.2 mm (3 inches on the DIN rail), depth 70 mm, height 130 mm. That's a standard 3-pole MCCB footprint — it clips onto the rail and leaves room for the auxiliary switch block and shunt trip underneath the cover. Rated insulation voltage is 800 V, so it's comfortable in 480 V and 600 V class panels with margin to spare.