What this MCCB is and what it protects
The Siemens SENTRON 3VA1063-3ED32-0DH0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection — the primary feeder breaker in a distribution panel that guards against overloads and short circuits before downstream branch devices. It carries a continuous current rating of 63 A at 40 °C, and that rating holds flat through 50 °C before a shallow derating curve begins: 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C. The interrupting capacity is what decides fit for available fault current: 75.6 kA at 240 V AC, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V. If your panel's prospective short-circuit current at the breaker line side exceeds those numbers at the system voltage, this breaker is not the right choice — step up to a higher interrupting frame.
Built-in release and auxiliary switch configuration
This variant ships with an undervoltage release (UVR) fitted — when control voltage drops below the dropout threshold, the UVR trips the breaker open. That is a common requirement for safety disconnects or emergency-stop chains where loss of control power must drop the load. The auxiliary switch block provides 2 auxiliary contacts plus 1 trip alarm switch (HQ configuration), giving remote status of the breaker position and whether it tripped on fault versus manual open. A trip indicator flag on the front confirms the trip state visually at the panel door.
Panel fit and environmental limits
The 3VA1063-3ED32-0DH0 occupies a 76.2 mm wide by 130 mm tall by 70 mm deep footprint. Rated insulation voltage is 800 V. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power loss is 19.8 W.