What this MCCB is and what it carries
The Siemens 3VA1063-3ED42-0JH0 is a SENTRON-series molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a continuous current rating of 63 A at 40 °C ambient, with minimal derating up to 70 °C (58 A per the datasheet). The 4-pole configuration handles three-phase plus neutral, and the rated insulation voltage of 800 V gives headroom for 690 VAC systems.
Breaking capacity across voltage levels
Breaking capacity is specified per the standard at multiple voltages: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V. The 415 V figure is the one that governs most European industrial panels; the 690 V figure confirms it can handle 690 V line-to-line faults, though at a lower interrupting rating.
Integrated auxiliary and shunt trip
This variant ships with a factory-fitted shunt trip (STL) for remote tripping and an auxiliary switch block comprising 2 auxiliary switches plus 1 trip alarm switch (HQ). The trip alarm signals the breaker's open state after a fault, which is useful for remote annunciation in a PLC-based monitoring scheme.
Panel fit and thermal management
The MCCB occupies a 101.6 mm width (4 in) and 70 mm depth (2.76 in) on the DIN rail or mounting plate. Maximum power loss is 17.3 W at rated load, which should be factored into enclosure thermal calculations — particularly in a sealed panel with multiple breakers ganged together.