The box is of combined type,its switch box is explosion -proof structure,busbar protection and outlet comartment adopt safety-increased structure.The shell is made of diecasted Al-alloy,installed MCB or MCCB,Has DZ47,NM1 to be supplied.With Protections of overload and short-circuit,electrical leakage protection is able to add to the user's requirement.Special type can bo made.Steel tube wiring or cable wiring.