1) When a fault occurs in the circuit, the current may suddenly increase. When the fault current in the circuit exceeds the action value of the relay/thermal relay, the relay action selectively cuts off the faulty circuit according to the selective requirements of the protection device.
2) When a fault occurs in the circuit, the current may suddenly increase. When the fault current in the line exceeds the upper limit of the current fuse box, the resistance fuse box will automatically fuse to cut off the load.
