What this MCCB carries and where it fits
The Siemens 3VA2063-6JQ32-0AA0 is a SENTRON molded case circuit breaker rated for 63 A continuous current at ambient temperatures from 40 °C through 70 °C — no derating needed across that span. Its breaking capacity reaches 242 kA at 240 V and 187 kA at 415 V, which means it can safely interrupt very high fault currents typical of large transformer secondaries or main feeders in industrial distribution panels. The 3-pole unit is sized for line protection duty, with an ETU560 electronic trip unit that supports adjustable N-conductor protection (OFF, 40% to 160%). Mounting dimensions are 105 mm wide by 181 mm tall by 86 mm deep — a standard 3-pole MCCB footprint that drops into most SENTRON 3VA2 panel cutouts and busbar systems. Front protection is IP40, adequate for enclosed switchboard installation where the breaker is behind a door.
Breaking capacity across voltage levels
This breaker's interrupting rating varies with system voltage: 242 kA at 240 V, 187 kA at both 415 V and 440 V, 121 kA at 500 V, and 3 kA at 690 V. The steep drop at 690 V is typical for a 63 A frame — the arc extinction energy scales with voltage, and the 3 kA figure still covers most 690 V motor branch circuits. For 400 V class distribution (the most common industrial voltage), 187 kA gives headroom for high-fault panels.
Trip unit and protection features
The ETU560 electronic trip unit provides adjustable overload and short-circuit protection curves. N-conductor protection can be set to OFF or from 40% to 160% of the phase current rating, which is useful for 4-wire systems where neutral loading varies. The breaker includes a communication function for remote monitoring or integration into a power management system. Rated insulation voltage is 800 V, and maximum power loss is 5.4 W — low enough that ventilation in a standard enclosure is sufficient.