What it is and what the ratings mean
The Siemens 3VA1180-6EF32-0KH0 is a 3-pole IEC molded-case circuit breaker in the 3VA1 series, frame size 160, with a breaking capacity class H rating of 70 kA at 415 V AC. That Icu figure means it can safely interrupt a fault current up to 70,000 A without welding or rupturing — critical for high-fault installations like large motor control centers or transformer secondaries where the available short-circuit current is substantial. The thermal-magnetic trip unit (TM240, ATAM) provides adjustable overload protection (Ir) from 56 A to 80 A, and short-circuit protection (Ii) set at 5 to 10 times the rated current In (80 A). This adjustability lets you fine-tune the overload pickup to match the cable or load ampacity, and set the magnetic instantaneous threshold to ride through motor inrush without nuisance tripping.
Integrated accessories and deployment context
Factory-fitted with a shunt trip (STL) rated 220-250 V DC and 208-277 V AC, plus two auxiliary switches (HQ) and one trip alarm switch (HQ). The shunt trip allows remote tripping from an E-stop or safety PLC; the auxiliary and alarm contacts feed status back to the control system. The nut keeper kit is included, which retains the terminal nuts during high-vibration installation — a small detail that saves time on a panel build. This breaker mounts on a DIN rail or can be screw-fixed to a backplate. In a panel, the 160 A frame size occupies roughly the same footprint as a standard 3VA1 three-pole unit; plan for adequate finger-duct clearance above and below for the shunt trip wiring and auxiliary cable looms.