What this breaker is and what the ratings mean
The Siemens 3VA1110-6MH36-0HA0 is a 3-pole IEC frame 160 molded case circuit breaker with a 100 A rated current (In) and a class H breaking capacity of 70 kA at 415 V AC. That 70 kA Icu means it can safely interrupt fault currents up to that level without welding its contacts or failing catastrophically — critical for high-fault-capacity installations like transformer secondaries or large motor control centers where upstream coordination demands a high-interrupt device. This variant is configured for starter protection with a TM120M thermal-magnetic trip unit set to 100 A, but note the description explicitly states "without overload protection" — the TM120M provides only short-circuit protection (Ii adjustable 5...15 x In). Overload protection must be handled externally, typically by a separate overload relay in the motor starter assembly. The shunt trip (STL) operates on 12-30 V DC or 24 V AC 50/60 Hz, allowing remote tripping from a safety circuit or E-stop chain.
Panel integration and wiring notes
The breaker uses clamp (box lug) connections, accepting copper or aluminum conductors sized for the 100 A rating. It mounts on a DIN rail or directly to a backplate via the frame's integral mounting points. The shunt trip terminals are separate from the main power path — verify polarity on the DC supply (12-30 V DC) and that the AC supply (24 V AC) is from the same phase as the breaker's line side to avoid nuisance trips from voltage sags.