... thermal relay series are suitable for overload and phase-failure protection of ACmotors with frequency of 50 ... It is used to protect AC three-phase asynchronous motor against overload and open-phase. The current setting value can be ... .5,2~3.2,2.5~4,3.2~5,4~6.3,5~8,6.3~10,8~ ... .5,2~3.2,2.5~4,3.2~5,4~6.3,5~8,6.3~10,8~ ... ,16~25 3UA54 32 660 4~6.3,6.3~10,10~16,12.5~20,16~ ... .5,2~3.2,2.5~4,3.2~5,4~6.3,5~8,6.3~10,8~ ...