Rating and fit for line protection
The Siemens SENTRON 3VA2063-6HN32-0AC0 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. Its maximum breaking capacity reaches 242 kA at 240 V, stepping down to 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3 kA at 690 V. That 242 kA figure at 240 V means it can interrupt very high fault currents typical on the secondary side of large distribution transformers, keeping upstream gear out of the fault path. The 800 V rated insulation voltage supports 480 V and 600 V class systems with margin.
Integration and auxiliary wiring
The breaker ships with two HQ auxiliary switches integrated, so you get status feedback without adding an external accessory block. No undervoltage release or ground-fault monitoring is included on this variant — those are separate add-on modules if your design requires them. The 86 mm depth and 105 mm width fit standard SENTRON panel cutouts; verify the 181 mm height clears your enclosure door clearance.