... -in type combination starter ,QJZ1-2000/1140(660)-9(10,11,12) is suitable to the coal mine well with mixed gas ... (220V).Technical Data TypeQJZ1-2000/1140,660-8,9,10,11,12StructureContactor: the control box is type of drawerRated Voltage(V ... current(A)400Working frequency(Hz)50Number of loops8,9,10,11,12 loopsContactor capacity (A)400Combination modesEach loop can combine arbitrarily