What this MCCB carries on the BOM
The Siemens 3VA1112-5MH32-0CH0 is a 3-pole IEC frame 160 molded case circuit breaker with a 125 A thermal-magnetic release (TM120M, AM characteristic) and a breaking capacity class M rated at Icu=55 kA at 415 V AC. It ships without overload protection — the TM120M provides short-circuit protection only, with adjustable instantaneous pickup Ii=5…15 × In.
The TM120M magnetic-only release (no thermal overload element) means this breaker is intended for motor starter protection where overload protection is handled by a separate overload relay; the adjustable instantaneous trip (5–15 × In) lets you coordinate with the motor inrush without nuisance tripping.