When the electrical equipment is being repaired, it is necessary to cut off the power supply to disengage it from the live part and maintain an effective isolation distance, and it is required to withstand the withstand voltage level of the overvoltage between the break points. The knife switch is used as a switching device for the isolated power supply. The knife switch that isolates the power supply is also known as the isolating switch. Isolation knife switches are generally unloaded on/off devices and can only switch on or off "ignorable currents" (referring to the busbar with voltage, the capacitor current of a short cable or the current of a voltage transformer). Some knife switches have a certain on-off capability, and when the on-off capability is compatible with the current required to be turned on, a part of the electrical equipment or the complete set of equipment can be switched on or off under non-fault conditions. The knife switch used as the isolating switch must satisfy the isolation function, that is, the switch break is obvious and the fracture distance is acceptable. The knife switch and the fuse are combined in series to form a unit called a knife switch fuse group; when the movable portion (moving contact) of the knife switch is composed of a fuse member with a fuse body, it is called a fuse type knife switch. Knife switch fuses are combined and additional auxiliary components such as operating levers, springs, arc knives, etc. can be combined into a load switch. The load switch has the ability to switch on or off the load current and a certain short-circuit protection function under non-fault conditions.
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