Terminal block Jf5 series products can be used in the circuit of ac50hz(60hz), rated voltage is 660v or dc440v , to connect round copper conductor which rated cross-section is 0.75-25mm2, performance in accordance with gb/t14048.1-2000"general regulations for low voltage switchgear and controlgear", and jb/t9659.1-1999"terminal block used in low voltage switchgear and controlgear", and also iec60947-7-1:1998 standard. All the type-tests are eligible by china quality supervise and inspection center for electric control and distribution, and achieved model certificate issued by tianjin design & research institute of electric drive, and no. Is f0163.