Sliecting thermosetting plastic, safety factor of small current is more reliable. Board type screw crinm commecting technology as structure parts. Rated AC voltage 600V. Rated current of connecting conduct piece with six specifications of 15A,25A,35A,45A,60A,100A. The cross-section 0.5-10mm². It can be divided into 3P,4P,5P,6P,10P,12P flat bolt installation according to arrangcmcnt, it will be more reliable for connecting current in different kind electric device.