What are the types of current relays
In our electrical facilities, we often use a type of electrical appliance is a leakage relay. It is used in automatic control circuits and is a switch for current operation. It has the functions of conversion circuit, automatic adjustment and safety protection. There are different types of earth leakage relays according to the working principle and structural characteristics of the failure.
One type, an electromagnetic leakage relay, as its name implies, is an electrical device that works on the principle of electromagnetic effects. It uses the magnetic effect to turn on the power box and cut off the power.
The second type, the magnetic reed leakage relay is a coil-induced current sensing device, which is a device that closes or opens the circuit when there is a magnet metal or other magnetically conductive objects approaching. Its structure is very sturdy, and its durability is very high. It is used as a limit switch for the location of mechanical equipment. It can also be used to detect that windows and iron stores are not in the specified location.
Third, the time leakage relay is a kind of electrical appliance with time delay control. There are many types. Air-damped time leakage relays are commonly used in AC circuits, which can effectively delay the power-on and power-off time according to its own working principle.
The fourth type, based on natural sensing raw materials, is used to query and control the temperature. It is called a thermal dry reed, and its working principle is to use special materials (temperature-sensitive magnetic) to work with the surrounding temperature sensitive characteristics.
Fifth, the optomechanical appliance is a device that controls the transmission of optical signals.
Sixth, intermediate leakage relays are used in many automatic control and protection circuits. They are very convenient to install and connect, have a long life, low power consumption, and have light pipe instructions after work to facilitate field observation and repair.