What this MCCB carries and where it fits
The Siemens SENTRON 3VA2063-6JQ36-0AA0 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, which simplifies panel sizing when the enclosure runs warm. Interrupting capacity hits 242 kA at 240 V and 187 kA at 415 V, so it handles high-fault utility feeds without cascading upstream — the kind of rating you spec for a main breaker on a 400 V distribution board or a transformer secondary. It measures 105 mm wide by 181 mm tall by 86 mm deep, a 3-pole footprint that drops into standard SENTRON panel-mount cutouts; the 86 mm depth leaves room for rear-connected busbars or cable lacing in a shallow enclosure.
Line protection and communication
Designed for line protection, this MCCB includes a communication function — it can report status or trip events over a bus, which matters when you need remote visibility of breaker state in a distributed panel. Ground-fault monitoring is built in via summation current formation on the L-conductor, so it can detect leakage without an external GFCI module — one less component to mount and wire. Rated insulation voltage is 800 V, giving headroom for 690 V systems where the interrupting capacity drops to 3 kA — that 690 V figure is the ceiling, not the working range; the breaker is at home on 400 V and 480 V distribution.