What it is and what it does
The Siemens 3VA1163-5MH32-0KA0 is a 3-pole IEC frame 160 circuit breaker from the 3VA1 series, rated at 63 A with a breaking capacity class M delivering Icu = 55 kA at 415 V AC. It is configured for starter protection with a TM120M thermal-magnetic release and an AM (adjustable magnetic) short-circuit release set at 5–15 x In. The unit includes a shunt trip (STL) coil rated for 220–250 V DC or 208–277 V AC and a nut keeper kit.
What the ratings mean for fit
The 55 kA Icu at 415 V means this breaker can safely interrupt fault currents up to that level without welding or rupturing — critical for high-fault-capacity industrial panels where upstream transformers or large motors feed into the bus. The TM120M thermal element provides motor overload protection (inverse-time curve), while the adjustable magnetic (AM) element handles short-circuit protection; the 5–15 x In adjustment range lets you tune the magnetic trip to match motor inrush without nuisance tripping. The shunt trip (STL) allows remote or emergency-off tripping via a control signal, common in safety circuits and E-stop chains.