What this MCCB carries
The Siemens 3VA1163-6MH36-0AH0 is a 3-pole molded-case circuit breaker from the 3VA1 IEC frame 160 series, rated 63 A continuous current with a breaking capacity class H — Icu of 70 kA at 415 V AC. That 70 kA figure means it can safely interrupt a fault current up to that level without welding its contacts or venting arc gas into the panel, which is the kind of headroom you want when coordinating downstream motor starters or distribution subfeeds. The TM120M thermal-magnetic trip unit is configured for starter protection: the thermal element is sized for motor inrush, and the magnetic instantaneous pickup is adjustable from 5 to 15 times In (315 to 945 A), letting you dial it in for the locked-rotor current of the load. This variant ships without overload protection (the TM120M provides only short-circuit and ground-fault protection), so it relies on a separate overload relay upstream or at the motor. It includes two auxiliary switches (HQ) and one trip alarm switch (HQ), all wired via clamp-type terminals — no ring lugs needed, which saves a few minutes per connection on the panel bench.