In the field of electrical engineering, signal relays play an indispensable role. These tiny devices perform more in circuits than one might expect.
What are the specific responsibilities and categories of signal relays?We invite you to learn more.
Expand the control range: The multi-contact relay can switch, cut off and turn on multiple circuits at the same time when the control signal sets the threshold, so as to realize the consistent control of multiple circuits.
Amplification function: sensitive relays and intermediate relays and other equipment, with the help of a small number of control actions to control high-power circuits, to achieve the effect of signal amplification.
Integrated signal processing: When a variety of control signals are input into the multi-winding relay in a specified way, the comprehensive processing will be carried out to achieve the predetermined control goal.
Automatic operation: In automatic equipment, the relay and other electrical equipment form a program control circuit, so as to realize the automatic operation of the circuit and achieve the effect of remote control and monitoring.
There are many ways to classify signal relays, mainly including the following three categories:
According to the principle of action:
Magnetoelectric relay: The armature and the movable part are driven by the magnetic field driven by the current inside the electromagnet. For example, DC stepless relays, DC polarized relays, AC relays, etc.
Induction relay: An alternating magnetic field is used to generate eddy current driving action in the wing plate of the moving part of the relay. Such as AC binary two-position relays.
Thermodynamic relay: A bimetal sheet is heated by an electric current that uses its unidirectional bending characteristics to drive action.
According to the working current:
DC relay: mainly used in DC circuits.
AC relay: mainly used in AC circuits, such as AC filament conversion relays, rectifier relays, etc.
AC and DC relays: suitable for AC and DC circuits, such as general relays, various thermal relays, etc.
According to the speed of action:
Snap-action relay: armature action time is less than 01s。
Ordinary relay: armature action time is 01~0.between 3s.
Slow relay: armature action time more than 03S, such as stepless slow discharge relay, safety semiconductor time relay, etc.
Through the above analysis, we can gain insight into the core functions of signal relays and their main classifications.
In practical applications, choosing the right relay is crucial for the stable operation of the circuit.
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