Wire connecting cavity is insolated form function cavity.There are five terminals in the function cavity, three ones are phase, one is neutral, the fifth is earth, there is earth screw on housing.

• 接线腔与元件腔分开，接线腔设有5个接线柱，其进线为3个相线、1个零线、1个保护线，壳外设有外接地螺钉。