Because there are many types of low-voltage electrical appliances, their functions are diverse, they are widely used, and their working principles are different, so there are different classification methods. According to its relationship with the use of the system, it can be divided into the following categories according to its usage.
(1) Control electrical appliances: electrical appliances used in various circuits and control systems. Such as contactors, relays, solenoid valves, etc.
(2) Distribution electrical appliances: electrical appliances used for power transmission and distribution. Such as knife switches, isolation switches, transfer switches, etc.
(3) Main electrical appliances: electrical appliances used to send control instructions. Such as push button switches, master switches, travel switches, etc.
(4) Protective electrical appliances: Electrical appliances used for safety protection of circuits and electrical equipment. Such as fuses, thermal relays, current relays, arresters, etc.
(5) Executive appliances: appliances used to perform certain actions and transmission functions. Such as electromagnet, electromagnetic clutch, electromagnetic brake, etc.