1. High voltage fuse: It is the simplest protective device used to protect electrical equipment from overload and short-circuit current damage. Its structure generally includes a fuse tube, a contact conductive part, a supporting insulator, and a base, etc. The fuse tube is filled with fine quartz sand particles used for arc extinguishing;
2. High voltage circuit breaker(vacuum circuit breakers): not only can it cut off or close the no-load current and load current in the high voltage circuit, but also can cut off the overload current and short circuit current through the relay protection device in case of system failure. It has a relatively complete arc extinguishing structure and sufficient breaking capacity;
3. High voltage load switch: It is an electrical appliance with functions between high voltage circuit breakers and high voltage isolation switches. High voltage load switches are often used in series with high voltage fuses;
4. High voltage isolation switch: It is an important switchgear in the electrical system of power plants and substations, and needs to be used in conjunction with high voltage circuit breakers. Its main function is to ensure the safety of high voltage appliances and devices during maintenance work, playing a role in isolating voltage.
