What this MCCB carries and where it fits
The Siemens SENTRON 3VA1163-6EF32-0BH0 is a 3-pole molded case circuit breaker (MCCB) rated 63 A at 40 °C, with a breaking capacity of 220 kA at 240 V — that is the short-circuit rating that governs its use on high-fault panels like main distribution boards or feeder breakers where the available fault current is substantial. Line protection design. 800 V rated insulation voltage. Includes undervoltage release (UVR) and auxiliary switch block: 2 auxiliary switches plus 1 trip alarm switch (HQ).
Thermal derating and panel integration
At 40 °C, 45 °C, and 50 °C the breaker holds its full 63 A rating. It begins to derate above 55 °C: 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C. In a sealed, uncooled enclosure that runs hot, expect to lose 5 A off the nameplate — plan your load accordingly. Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep. The 70 mm depth is the body-only measurement; add clearance for the handle throw and wiring gutters. The 76.2 mm width (3 inches) is a standard MCCB footprint — it drops into a typical SENTRON panel mount without drilling new holes. Maximum power loss is 19.8 W. In a dense panel with multiple breakers side-by-side, that heat adds up — factor it into your thermal budget rather than relying on free-air convection alone.
Breaking capacity across voltage levels
The interrupting rating drops as voltage rises: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at both 500 V and 690 V. At 690 V the 17 kA figure is the limiting factor — verify your available fault current at that voltage before specifying.