Motor protection switch complete device (basic device and electronic trip unit) according to IEC60947-4-1, electronic wide-range overload protection (4:1), phase failure and asymmetry protection, adjustable trip class, high short-circuit breaking capacity, isolator function, lockable in 0 position. Flexible adjustment of the current range through exchangeable electronic trip units. Can be expanded with auxiliary switch, voltage release, current limiter, door coupling handles, ATEX approval