The Siemens SENTRON 3VA2063-5JQ32-0KL0 is a 3-pole molded case circuit breaker rated for 63 A continuous at 40 °C through 70 °C — no derating needed across that full ambient span, which simplifies panel layout in warm enclosures. Its interrupting capacity hits 187 kA at 240 VAC, 121 kA at 415 VAC, and 75.6 kA at 500 VAC, dropping to 3 kA at 690 VAC.
The 63 A full-scale rating with a 16 A initial setting range (adjustable from 16 A to 63 A) gives you flexibility to tune the trip threshold to the actual load without swapping the breaker. The interrupting curve tells the real story: at 240 V it clears 187 kA, at 415 V it clears 121 kA, at 500 V it clears 75.6 kA, and at 690 V it clears 3 kA. That 3 kA at 690 V is a hard limit; if your system runs 690 V with fault current above that, this breaker is not the fit. That means it can report its status and trip events back to a PLC or BMS — useful for remote monitoring in a distributed line-up. No undervoltage release is fitted, so if undervoltage protection is required, it must be added externally.
Maximum power loss is 5.4 W, so heat dissipation in a sealed panel is manageable; no forced cooling required for a single unit.
Environmental limits and approvals
The basic switch variant is 3VA20635JQ320AA0, which is the internal switching mechanism.