What is the function of a relay? It is something people want to know,.Below we will provide a detailed understanding of the functions of relays. If you are not familiar with relays, you can click to learn about relay knowledge
Automatic control function
Implement on/off control of circuitry
Relays can automatically switch the on/off state of circuitry based on variable inputs, such as voltage and current. In a given automatic production line, after the sensor detects that certain conditions have occurred to prompt the turning on or off of the signal corresponding to a relay action, the output that occurs will trigger a relay action controlling the operation of a motor or valve by switching the relevant circuitry on or off.
Protection function
Overcurrent protection and undervoltage protection
When the current in the circuit is too high or below the set value, the relay can cut off the circuit to prevent electrical equipment from being damaged due to low voltage operation
Overheating protection
Some electrical equipment, such as a motor, transformer, etc., are apt to get overheated. Temperature relays are mounted on such equipment for overheating protection. When the temperature of the device rises above the set value, the temperature relay operates and disconnects the circuit to avoid damage to the device caused by overheating.
Signal amplification function
Current amplification
Since the contacts of the relays can support large currents, it is able to convert small current input signals to large current output signals and therefore achieve the function of current amplification.
Voltage amplification
Similarly, relays also can achieve the function of voltage amplification. When the input signal voltage is low, the relay coil and contacts can transform the input voltage into high output voltage to meet the voltage conditions of different devices.
Isolation function
Electrical isolation
Electromagnetic induction drives the relay coil and contacts. Thus, electrical isolation is achieved between the input circuit and the output circuit. This isolation would, to a great degree, avoid the hazardous factors of high voltage and high current in the input circuit from causing damage in the equipment and personnel in the output circuit.
Signal Isolation
Besides electrical isolation, the relays can also achieve the function of the signal isolation. The relay may convert the input signal into the action signal of the contact and achieve the signal isolation transmission by controlling the on/off of the output circuit with opening and closing in case of the requirement that the input signal and output signal are isolated from each other.
For some automation control systems, signal isolation can effectively prevent different signal interferences and crosstalk; it enhances the stability and reliability of the system.
Overview
There are so many classifications of the relay, which then gives us a lot of characteristics and functions. They are also very much in use in everyday life, just like the starter motors of the household appliances or cars around us. Choosing the right kind of relay could better enhance its functionality. More knowledge? Click on another blog to provide the detailed explanation of the relay.Contact us to provide you with relay solutions
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