... circuit and overload and make and break load current of transformer and circuit.2. Hereinto, drop-out fuse ... which are used to make and break the load current.3. When the drop-out fuse works normally, ... If the system has the troble, the fault current will cause that the fuse is blown out rapidly ... the arc chute produces the gas, when the current crosses zero, the electric arc is exitinguished.Outline ...