The Siemens 3VA1163-5MH32-0HH0 is a 3-pole IEC molded-case circuit breaker in the 3VA1 series, built on the frame 160 platform. It carries a breaking capacity class M rating of Icu=55 kA at 415 V AC, sized for high-fault industrial distribution panels where selective coordination with downstream feeders matters. Rated at In=63 A with a TM120M thermal-magnetic trip unit, this breaker provides starter protection (motor circuit) via an adjustable magnetic short-circuit release set at Ii=5…15 × In. Note the absence of integral overload protection — the TM120M here is configured for short-circuit protection only, meaning a separate motor overload relay must be wired upstream or in the starter assembly.
Accessories and control wiring
Factory-fitted with a shunt trip (STL) rated for 12–30 V DC or 24 V AC 50/60 Hz, plus two auxiliary switches (HQ) and one trip alarm switch (HQ). The nut keeper kit is included on the line-side terminals — a detail that saves panel-build time versus sourcing it separately. The shunt-trip coil allows remote tripping from a safety PLC or E-stop circuit; verify polarity on the DC supply before energizing.