The Siemens 3VA1163-6MH32-0JC0 is a 3-pole IEC molded case circuit breaker in the 3VA1 series, on a 160 A frame but fitted with a 63 A TM120M thermal-magnetic trip unit configured for starter protection — meaning it is sized for motor branch-circuit short-circuit protection without built-in overload protection, which is handled separately by an external overload relay. The 'H' breaking capacity class delivers 70 kA Icu at 415 V, so it can safely interrupt fault currents up to that level without upstream cascading — a key spec for high-fault panels where the available short-circuit current is known to be above 25 kA.
This breaker includes a shunt trip (STL) rated 110-127 V AC/DC and two HQ auxiliary switches for remote status feedback. The nut keeper kit is pre-installed, which simplifies panel mounting on a DIN rail or mounting plate — one less loose part to track during assembly. The magnetic short-circuit pickup Ii is adjustable from 5 to 15 times In (315 A to 945 A), giving flexibility to ride through motor inrush without nuisance tripping.