Summary of electrical components

Electrical components are the basic components that make up electrical systems and electronic devices. They play different roles in circuits and work together to achieve various electrical functions. The following are some common electrical components and their basic functions and features:
Circuit breaker: A circuit breaker (QF) is an automatic air switch that can be operated manually and can also automatically cut off the circuit to protect power lines and equipment from faults such as overload, short circuit or undervoltage.
Contactor: A contactor (KM) consists of an electromagnetic mechanism and a contact system, which is used to connect and disconnect circuits and is often used to control electrical loads such as motors. The contactor has undervoltage release protection and zero voltage protection functions, which are suitable for frequent operation and remote control.
Thermal relay: A thermal relay (FR) uses the principle of thermal effect generated by current passing through the element to perform inverse time action, and is mainly used for overload protection.
Intermediate relay: An intermediate relay (KA) is used to convert an input signal into multiple output signals or amplify signals, and is often used to expand the number or capacity of contacts.

‌Button‌: Button (SB) is used to control the on and off of the circuit. Common colors include red (stop), green (start), black (alternating action), etc., which are used to indicate the operating status of the equipment.

‌Indicator light‌: The indicator light is used to indicate the running or stopping status of the equipment and monitor whether the power supply is normal. It usually has red, green, blue and other colors.

‌Fuse‌: A fuse is a safety protection device. When the current exceeds the specified value, it heats up to melt the fuse, thereby disconnecting the circuit. It is widely used in high and low voltage power distribution systems and electrical equipment.

‌Time relay‌: After receiving the signal, the time relay triggers the output after a certain time delay, and is often used for timing control.

‌Travel switch‌: The travel switch (also known as the position switch) uses the action of the mechanical moving parts to control the on and off of the circuit. It is often used to limit the position or travel of the mechanical movement.

‌Conversion switch‌: The conversion switch is used to switch multi-circuit circuits. The moving contact on the rotating shaft is connected or disconnected with the static contact in turn to achieve circuit switching.

These electrical components play an important role in electrical systems and electronic equipment, and understanding their basic functions and characteristics is essential for electrical design and maintenance.