MCCB with shunt trip — what the ratings mean for the panel
The Siemens SENTRON 3VA1163-4EF32-0HA0 is a 3-pole molded case circuit breaker rated 63 A continuous at 40 °C, designed for line protection in distribution panels. Its interrupting capacity hits 121 kA at 240 V and 75.6 kA at 415 V — figures that govern fault-clearing at the main or feeder level without cascading upstream. The built-in shunt trip (STL) release lets a remote signal (e.g., emergency-stop contact, undervoltage relay) open the breaker electrically, which is the usual reason a buyer specifies this variant over a plain thermal-magnetic unit.
Thermal derating and operating range
The breaker holds its full 63 A rating up to 50 °C ambient; above that it derates linearly to 58 A at 70 °C. That matters for panels packed tight or installed in warm enclosures — the 63 A nameplate applies only if the internal panel temperature stays under 50 °C. Operating ambient spans -25 °C to 70 °C, storage from -40 °C to 80 °C. Insulation voltage is rated 800 V, so the breaker is suitable for 690 V systems.
Panel fit and footprint
The breaker measures 76.2 mm wide by 130 mm tall by 70 mm deep — a standard 3-pole MCCB footprint that drops into most SENTRON or third-party distribution panels without re-drilling. No communication function, no ground-fault monitoring, no undervoltage release on this variant; the only auxiliary release is the shunt trip. Power loss at full load is 17.3 W, so account for the heat in a sealed enclosure.