Electricians must know common electrical components

Electricians must know common electrical components
Electric House 999 2022-03-29 17:09
Electrical components are the most commonly contacted equipment in electrical work. For novice electricians, it may not be easy to open an electrical drawing and find the corresponding electrical components according to the symbols in the drawing.

The following simple list of some commonly used electrical components: circuit breaker series, all kinds of switches, contactors, relays, all kinds of buttons, indicators, and then is the frequency converter and PLC.
1. Various circuit breakers
Household circuit, industrial circuit, commonly used generally: air switch, leakage protector, fuse, over-voltage protector, etc., according to the carrying capacity of the equipment reasonable use.
2. Symbol of the circuit breaker
3. Switch
4. Symbols plus graphic symbols
5. Ac contactor
Ac contactor is divided into coil and contact two parts, when using must pay attention to the voltage of the coil. Ac contactor usually adopts three arc extinguishing methods: double fracture electric arc extinguishing, longitudinal slit arc extinguishing and grid arc extinguishing.
6. Thermal overload relay: commonly used to protect the motor
Application scope of thermal overload relay: Thermal overload relay is used in the circuit of AC 50Hz, rated insulation voltage 660V, current 0.1-630A, mainly used for three-phase AC motor overload and phase break protection. And can be combined with a suitable AC contactor starter, often used for motor overload protection.
7. Intermediate relay
Intermediate relay is a multi-purpose automatic remote device in relay protection and automatic control system. Intermediate relays because of good electrical isolation. To make the control party and the accused party without electrical connection, and achieve safety control purposes.
8. Intermediate relay symbol
9. Various button switches
10. All kinds of button switches
11. Light in various colors
12. Travel switch
13. Symbol of travel switch
14. The inverter
Inverter is mainly composed of rectifier (AC to DC), filter, inverter (DC to AC), brake unit, drive unit, detection unit and micro-processing unit. Inverter by internal IGBT off to adjust the voltage and frequency of the output power supply, according to the actual needs of the motor to provide the required power supply voltage, so as to achieve the purpose of energy saving, speed regulation, in addition, inverter has a lot of protection functions, such as over current, over voltage, overload protection and so on. With the continuous improvement of industrial automation, frequency converter has been widely used.