Low-voltage electrical appliances are classified according to their functions

Can be divided into 1 switch electrical. An electrical appliance that turns on and off the circuit and has a certain on-off capability, such as a changeover switch, a starter, and the like. 2 fuses. Break the electrical equipment of the circuit under overload or short circuit conditions, such as high breaking capacity fuses, self-resetting fuses, etc. 3 relays. Electrical appliances for control and protection. 4 resistors and varistors. Electrical appliances that change circuit parameters or convert electrical energy into thermal energy, such as starting resistors, regulating resistors and starting varistor, field varistor, etc. 5 regulators. An appliance that keeps certain quantities in the circuit constant or changes it in a predetermined manner. 6 electromagnets.