The Siemens SENTRON 3VA2163-6HL36-0AJ0 is a 3-pole molded case circuit breaker rated for 63 A continuous current at 40 °C ambient, with an ETU320 electronic trip unit for line protection. The 187 kA at 415 V and 440 V holds for most European industrial distributions, and the 121 kA at 500 V covers 480 V North American systems with margin. At 690 V it still clears 5 kA, enough for motor circuits on IT systems. That matters when you need selectivity with downstream breakers or want to ride through motor inrush without nuisance trips. The unit draws 4 W max in operation, negligible for the panel thermal budget.
The 3VA2163-6HL36-0AJ0 measures 105 mm wide, 181 mm tall, and 86 mm deep — a standard SENTRON 3VA frame size that fits existing panel cutouts and busbar arrangements. The auxiliary contact configuration (2 aux switches + 1 trip alarm switch HP) is built in, saving a slot in the panel for separate alarm modules. Rated insulation voltage is 800 V, and the operating range spans -25 °C to 70 °C ambient, with storage from -40 °C to 80 °C. The continuous current derates above 55 °C — at 70 °C it carries 53.55 A, so factor that into your thermal design if the breaker sits near heat sources.