What this MCCB is and what it protects
The Siemens 3VA1163-6MH36-0CC0 is a SENTRON molded case circuit breaker (MCCB) designed specifically for starter protection, meaning it is built to coordinate with motor contactors and overload relays in a motor branch circuit. Rated 63 A continuously at 40 °C ambient, it holds that full rating through 50 °C before thermal derating begins — at 55 °C it carries 62 A, at 65 °C it carries 60 A, and at 70 °C it carries 58 A, so in a warm panel you still have most of the capacity. The 3-pole construction fits three-phase motor circuits, and the 800 V rated insulation voltage gives headroom for 480 V and 600 V class systems.
Breaking capacity — what the numbers mean for your fault current
This breaker delivers 220 kA interrupting capacity at 240 V, 154 kA at 415 V, and 121 kA at 440 V — figures that cover high-fault industrial services like large transformer secondaries or utility tie points. At 500 V and 690 V the rating drops to 7.5 kA, so on a 690 V system this is suited to downstream distribution with limited fault current, not a main service entrance.
Auxiliary and undervoltage release — what ships inside
The breaker comes factory-fitted with two HQ auxiliary switches and an undervoltage release (UVR), so it can report its open/closed state to a PLC and trip automatically on loss of control voltage — no separate accessory purchase needed for those functions. It does not include a ground-fault monitoring module, a communication function, or a voltage-trip feature; those would require additional accessories or a different variant.
Panel fit — dimensions and integration
At 70 mm deep, 76.2 mm wide, and 130 mm tall, this MCCB occupies a standard 3-pole molded-case footprint and mounts directly to a panel backplate or DIN rail adapter. Maximum power dissipation is 19.8 W — a figure to consider when calculating enclosure heat rise, especially in a sealed panel with multiple breakers.