Btp-30 series modulus terminal box is applicable to the single-phase three-wire or three-phase five wire terminal circuit of ac 50/60hz,rate voltage 230/400v, current with load 100a or less.it is used to distribute and control the electric equipments, to protect the line from overload ,short circuit,and leakage.it can be widely applied in such modern construction occasions as hotel ,hospital ,residential building and tall structure,etc the product is in conformity with stands:gb/t 14048.1 iec60947-1