The Siemens 3VA1112-6MH36-0AH0 is a 3VA1 IEC frame 160 circuit breaker with a breaking capacity class H, rated Icu=70kA at 415 V. It is a 3-pole unit with a TM120M trip unit set at In=125 A, designed for starter protection — meaning it provides short-circuit protection (adjustable Ii=5...15 x In) without overload protection, relying on an external overload relay for motor branch circuits.
Key Ratings and Fit
The 70 kA breaking capacity at 415 V means this breaker can safely interrupt fault currents up to that level without upstream cascading — critical for high-fault installations where the available short-circuit current is substantial. The TM120M thermal-magnetic trip unit is fixed at 125 A, with the magnetic short-circuit pickup adjustable between 5 and 15 times the rated current (625 A to 1875 A), letting you coordinate with downstream motor starting inrush. The 3VA1 frame is a standard panel-mount design with clamp terminals for easy wiring. It includes two auxiliary switches (HQ) and one trip alarm switch (HQ) as factory-fitted accessories, so you get status feedback and alarm indication without additional wiring modules.