... .3UA thermal relay series are suitable for overload and phase-failure protection of ACmotors with frequency of 50/60Hz ... It is used to protect AC three-phase asynchronous motor against overload and open-phase. The current setting value can be regulated ... 25,1~1.6,1.25~2,1.6~2.5,2~3.2,2.5~4,3.2~5,4~6.3,5~ ... 25,1~1.6,1.25~2,1.6~2.5,2~3.2,2.5~4,3.2~5,4~6.3,5~ ... 25,1~1.6,1.25~2,1.6~2.5,2~3.2,2.5~4,3.2~5,4~6.3,5~ ...