What this MCCB is and where it fits
The Siemens 3VA1163-5GE42-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 63 A continuous current at 40 °C, with a TM220 thermal-magnetic release designed for line protection. Its 4-pole construction suits three-phase plus neutral applications in distribution panels or as a main disconnect in industrial switchboards. The 70 mm depth and 101.6 mm width keep it within a standard MCCB footprint, so it slots into existing SENTRON mounting bases without re-drilling gland plates.
Breaking capacity and selectivity
This breaker delivers 187 kA interrupting capacity at 240 V AC, dropping to 121 kA at 415 V and 75.6 kA at 440 V — figures that give the panel designer headroom for high-fault utility feeds without cascading upstream. At 500 V and 690 V it still clears 17 kA, which covers most industrial motor-control center secondary faults. The 800 V rated insulation voltage supports 690 V line-to-line systems with margin.
Thermal derating and power loss
Rated 63 A from 40 °C through 50 °C, the breaker holds full ampacity across the typical panel ambient. Above 50 °C it derates gradually: 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, 58 A at 70 °C. Maximum power loss is 17.3 W — a number to check against enclosure heat budgets when packing multiple breakers in a sealed cabinet. Operating range is -25 °C to 70 °C; storage from -40 °C to 80 °C.