The Siemens 3VA1120-3EE32-0KM0 is a 3-pole IEC molded case circuit breaker from the 3VA1 frame 160 series, rated at In=20 A with a breaking capacity of Icu=25 kA at 415 V (class N). The TM220 thermal-magnetic trip unit provides adjustable overload protection from 14 A to 20 A and a fixed short-circuit pickup of 16 x In. This variant includes a shunt trip (STL) rated 220-250 V DC / 208-277 V AC, two HQ auxiliary switches, and one HQ short-circuit alarm switch, plus a nut keeper kit for secure mounting.
The 25 kA Icu at 415 V places this breaker in breaking capacity class N, suitable for downstream distribution in industrial panels where fault currents stay under that threshold. The adjustable Ir (14-20 A) lets you match the thermal trip to the actual continuous load without swapping the breaker body. The fixed Ii at 16 x In (320 A) means magnetic trips are non-adjustable — verify that the inrush of your load (motor starting, transformer energization) does not exceed this pickup to avoid nuisance tripping.
Integration and deployment
The included shunt trip allows remote tripping from a safety circuit or emergency-stop chain.