Siemens 3VA1120-4EF36-0AH0 is a 3-pole IEC frame 160 molded-case circuit breaker with a 36 kA interrupting capacity at 415 V AC — class S breaking capacity, meaning it handles high fault currents typical of industrial distribution panels without cascading upstream. The TM240 thermal-magnetic trip unit gives you adjustable overload protection from 14 A to 20 A (Ir) and short-circuit pickup from 8 to 16 times In (Ii). That adjustability lets you fine-tune coordination with downstream feeders without swapping the breaker.
Accessories Included
Comes with two auxiliary switches (HQ) and one trip alarm switch (HQ) factory-installed. The aux switches signal breaker position (open/closed) to a PLC or status lamp; the trip alarm differentiates a fault trip from a manual open — useful for remote alarm panels or motor control center (MCC) monitoring.