Low-voltage appliances according to the use and control objects can be divided into which categories are as follows:
1. Power control appliances: mainly used to control motors, frequency converters, speed reducers and other transmission equipment, such as motors and other equipment, start-stop, forward and reverse, speed regulation and other functions are realized.
2. Lighting appliances: can be used to switch on and off the lighting fixtures, adjust the brightness and color temperature and other controls, in the office, residential, factories and other places are widely used.
3. Protection of electrical appliances: mainly used to protect the occurrence of overcurrent overload, short-circuit and other faults, in order to cut off the circuit, to avoid damage to electrical equipment and eliminate potential safety hazards.
4. Measurement of electrical appliances: current, voltage, power and other means of testing, detection and monitoring of electrical equipment.
5. Control appliances: mainly used to control temperature, humidity, pressure, flow and other parameters, such as air conditioning systems, ventilation systems, boiler systems, water supply systems, etc., in order to achieve automatic control.
6. Signal class electrical appliances: mainly used for the switching state, indicating signals, alarm signals and other transmission and acceptance, such as buttons, lights, buzzers, alarms and so on.
Special-purpose low-voltage appliances:
1. Reversing class electrical appliances: mainly used for the exchange of the circuit connected to the order of sequence and phase order, to achieve the normal operation of equipment.
2. Computer and communication equipment electrical appliances: for computer and communication equipment, power supply, enhancement of the circuit, protection circuit.
3. Home appliances: such as home business appliances, safety control appliances, medical appliances.
4. Special industrial appliances: involving high temperature, high pressure, strong current and other environmental equipment control.
5. Contactor: a normally closed or normally open electrical appliances, can connect or cut off the circuit when charged.
6. Relay: a kind of electrical self-control switch that can separate the control program of the circuit. For example, a relay can be used to control the opening/closing of another circuit when the control circuit is on.
7. Switch: a mechanical electrical component used to open or close a circuit.
8. Protector: It can protect various electrical equipment by stopping them in case of circuit overload, short-circuit and malfunction.
9. Transformer: Transformer is a kind of equipment to change the AC voltage and current, widely used in electric power, communication, instrumentation and other industries, as well as household electricity.
These control appliances can form a complex electrical control system to provide support for the operation of various industrial equipment. At the same time, they also need to be maintained and managed in conjunction with related regulators, testing instruments and other equipment to ensure the normal operation of the equipment.
These low-voltage electrical appliances are more based on the development for specific industries or use occasions to meet a variety of different needs. In short, low-voltage appliances play a pivotal role in modern production and life, and constantly promote the progress of science and technology and social development.