The Siemens SENTRON 3VA2063-5KP32-0AJ0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current, with an ETU850 electronic trip unit. Breaking capacity hits 187 kA at 240 V, 121 kA at 415/440 V, 79 kA at 500 V, and 3.4 kA at 690 V — enough for high-fault utility feeds or transformer secondaries without cascading upstream. This is a line-protection version (not motor-protection), so it's sized for feeder or main breaker duty in distribution panels. The ETU850 provides communication and other measurement functions, plus a 2-auxiliary + 1-trip-alarm contact block built in.
Panel footprint: 86 mm deep, 105 mm wide, 181 mm tall. Front IP40 protection — suitable for dead-front switchboard mounting, not for washdown environments. Power loss at rated current is 5.4 W, manageable in a standard enclosure without forced ventilation. Ambient operating range -25 °C to 70 °C; current derating starts at 55 °C (60.6 A) down to 53.55 A at 70 °C. Storage range -40 °C to 80 °C. Mechanical endurance 20,000 operations.
Rated insulation voltage Ui 800 V — covers 480/600 V class systems with margin. No undervoltage release, no ground-fault monitoring, no voltage trigger. The base switch is 3VA2063-5KP32-0AA0.