The LW5D-16 series universal conversion switch is suitable for converting electrical control circuits (such as electromagnetic coils, electrical measuring instruments, and servo motors) in AC circuits with a frequency of 50Hz and a voltage of up to 500V, and in DC circuits with a voltage of up to 440V. It can also directly control a 5.5KW three-phase squirrel-cage induction motor (start, reversible conversion, and variable speed).