What this 3VA1 MCCB is and what the ratings mean
The Siemens 3VA1112-5MH36-0AD0 is a 3-pole IEC frame 160 molded-case circuit breaker rated 125 A continuous, with a breaking capacity of 55 kA at 415 V AC — that is the 'M' class rating, meaning it can safely interrupt fault currents up to that level without upstream cascading. The TM120M thermal-magnetic trip unit provides starter protection: the magnetic pickup is adjustable from 5 to 15 times In (so 625 A to 1875 A short-circuit pickup), and the thermal element is fixed at 125 A. Note the 'without overload protection' in the description — this variant ships without the overload relay module (AM), so it acts as a magnetic-only short-circuit protector for motor starter applications where a separate overload relay handles the thermal curve.
Deployment context
Clamp terminals accept solid or stranded copper — strip length and torque per the nameplate. Three auxiliary switches (HQ) are integrated for status feedback to a PLC or safety relay. Mounts on a DIN rail or panel-mount footprint common to the 3VA1 frame family.