Many people don't understand the isolating switch and the load switch. The two switches are considered to be universal and can be replaced, so they can be used regardless of the three seven twenty-one. In fact, these two switches are different, and it is normal to replace them. However, there are some occasions that cannot be replaced. Kexu Electromechanical Xiaobian tells you what is the difference between the isolating switch and the load switch.

The isolating switch itself does not have an arc extinguishing device, and can only disconnect the rated current at most, so it is only used as an isolating component in the circuit, and the power supply and the load are isolated when it is necessary to repair.

The load switch has an arc extinguishing device that can disconnect the fault current, and its contact can be used as an isolating switch, which has the dual functions of isolation and open circuit. The load switch is generally composed of a fuse and an isolating switch. The isolating switch is used for normal loop operation, and the fuse is used to disconnect the fault current of the loop.