The Siemens SENTRON 3VA2163-5MN36-0AD0 is a 3-pole molded case circuit breaker 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 matters when the breaker lives inside a warm panel next to drives or transformers. Its interrupting capacity hits 187 kA at 240 V and still holds 121 kA at 415 V and 440 V, dropping to 75.6 kA at 500 V and 3.7 kA at 690 V. The design is explicitly for motor protection, with built-in phase failure detection. That means it will trip on loss of a phase — a common cause of single-phasing damage on three-phase motors driving conveyors, pumps, or compressors.
The 86 mm depth leaves clearance for rear-connected busbars or a gland plate behind the breaker. Power loss is 4 W maximum at rated current — negligible for panel thermal budgeting, but worth noting if you are packing a dozen of these into a small enclosure. The breaker ships with three HQ auxiliary switches fitted (the basic switch is order code 3VA21635MN360AA0).