What this breaker is and what the ratings mean
The Siemens 3VA1112-6MH32-0KA0 is a 3-pole IEC frame 160 circuit breaker rated 125 A continuous, with a 70 kA breaking capacity at 415 V AC — that's class H on the 3VA1 platform, meaning it can safely interrupt fault currents up to that level without upstream cascading. The TM120M thermal-magnetic release provides starter protection (motor branch circuit), but note the description flags 'without overload protection' — the TM120M here is configured for short-circuit protection only, with an adjustable instantaneous trip Ii = 5–15 × In. The integrated shunt trip (STL) operates on 220–250 V DC or 208–277 V AC, letting you remotely trip the breaker from a safety circuit or E-stop chain.
Integration notes for the panel
Mounts on DIN rail in a standard IEC enclosure. The nut keeper kit is included in the order code — that holds the terminal screws captive during wiring, a small thing that saves time on a panel line. The shunt trip occupies the accessory slot; verify coil voltage matches your control circuit before commissioning (220–250 V DC or 208–277 V AC). The 3VA1 frame 160 is physically compact for its 125 A rating, leaving fill-factor room in the gland plate for additional branch feeders.