63 A MCCB for line protection — 242 kA interrupting at 240 V
The Siemens 3VA2063-6HL32-0AF0 is a SENTRON molded case circuit breaker (MCCB) rated for 63 A continuous current across the full ambient temperature range from 40 °C to 70 °C — no derating needed up to that ceiling. Its 242 kA interrupting capacity at 240 V AC handles high-fault utility feeds and transformer secondaries without cascading upstream. At 415 V and 440 V it still breaks 187 kA; at 500 V that drops to 121 kA, and at 690 V it holds 3 kA. The 800 V rated insulation voltage keeps it safe on 480/277 V and 600 V systems with margin.
Panel fit and auxiliary switch complement
At 105 mm wide, 181 mm tall, and 86 mm deep, this 3-pole MCCB fits standard Siemens 3VA mounting accessories and busbar systems. It ships with one auxiliary switch and one trip alarm switch (HQ type) integrated — enough for remote status and fault indication without an add-on module. Power loss is 5.4 W maximum, manageable in a sealed enclosure with basic ventilation.