Siemens 3VA1163-5EF32-0AB0 — a 63 A SENTRON MCCB with 187 kA interrupting capacity
The Siemens 3VA1163-5EF32-0AB0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated for 63 A continuous at 40 °C, with a TM240 thermal-magnetic trip unit. Its headline breaking capacity hits 187 kA at 240 V, 121 kA at 415 V, and 75.6 kA at 440 V — figures that tell you this breaker is built for high-fault-current panels where a standard MCB would weld itself shut.
The 63 A rating holds flat from 40 °C through 50 °C, then derates to 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C (–). That's a shallow derate curve — you can run it near its nameplate in a warm enclosure without oversizing. Power loss is 17.3 W max — negligible for panel ventilation but worth knowing if you're packing breakers side-by-side.
Panel integration and auxiliary wiring
Dimensions are 70 mm deep, 76.2 mm wide, 130 mm tall (–) — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures.