The Siemens 3VA2063-5HL36-0BL0 is a 3-pole SENTRON molded case circuit breaker rated for 63 A continuous current at 40 °C, with an interrupting capacity of 187 kA at 240 V. That 187 kA figure drops to 121 kA at 415 V and 440 V, then to 79 kA at 500 V, and 3.4 kA at 690 V — so at typical 400 V distribution levels, it still clears 121 kA of fault current without the breaker welding itself shut. The ETU320 electronic trip unit handles the curve shaping and coordination. The breaker holds its full 63 A rating from 40 °C up through 50 °C; it starts derating above that — 60.6 A at 55 °C, 58.3 A at 60 °C, down to 53.6 A at 70 °C. This is a line-protection version — no voltage trigger, no phase-failure detection, no communication module. It's built to sit on the incoming feeder or a heavy branch circuit and clear faults on overcurrent alone.
Bolts into the enclosure backplate on a 3-pole base; no DIN-rail clip on this frame class. The undervoltage release (UVR) is factory-integrated (order code 3VA9608-0BB11), so if the control voltage drops, the breaker trips without a separate shunt-trip module taking up panel real estate.