Your shopping cart is empty! Please select the type which you want.
Home > Mall Dynamic > The Advantages And Disadvantages OF The Working Principle OF Reed Relay
The concept of the wafer switch was first proposed by a professor of Leningrad Electrotechnical University in 1922. He came up with the idea of a contact controlled by magnetism and switched on and off under the influence of a magnetic field. The reed switch was first invented by Walter B. Eilwood in 1936 at Bell Telephone Laboratories for use in automatic telephone exchanges. Since then, telephone switching technology no longer uses reed switches, but the technology is still widely used in the field of sensors and relays. In this paper, the basic knowledge of reed relays is briefly introduced.
A type of relay that uses an electromagnetic coil to operate one or up to eight reed switches is called a reed relay, and the switch is usually located in the line of the relay. These relays are suitable for different areas of electrical or electronic circuits where faster and smaller relays are needed.
Reed relays perform very fast and are small in size, requiring very little power to activate compared to other types of relays. So they're used in different types of electronic circuits,
The reed relay switch is a sealed glass housing consisting of two reeds made of a magnetically sensitive material, such as a ferromagnetic material. The glass housing of the relay is filled with dry inert gas to avoid contact oxidation. Electromagnetic wires are wound around the switch, which acts like an armature. Therefore, both ends of the reed switch need only be connected to the input and output of the circuit.
The reeds are at both ends of the relay. Once an axial magnetic field is applied to these blades, they come into contact with each other and form repeatable electrical contacts. In this type of relay, the magnetic field is generated by a coil covered with a glass housing.
The advantages of reed relays include the following:
Simple and stable operation for significant design flexibility.
Reliable, simple sensing and drive capabilities.
Extended durability and performance during service life.
A smaller form factor design that facilitates the integration of lighter component weights in space-constrained environments will avoid responding to the heavy load of electronics. Walking is easy.
The switching speed is very fast.
Can be easily installed into D or SIL packages,
Provides complete isolation between the switching current and the switching circuit. No additional components are required other than the magnet for its operation
Can switch between AC and DC.
In certain cases, voltages up to 200V can be switched Some models are capable of switching 500mA currents.
The relay is used indefinitely with magnets in on or off conditions without consuming any power performance is not affected by dirt or dust as is the case with optical switches.
It can be opened through non-magnetic materials such as paper or plastic.
The disadvantages of reed relay include the following aspects:
It works by using separate magnets. In addition, once the magnet is a few meters away from the switch component, it does not function satisfactorily.
It cannot be miniaturized like any other surface-mount based chip.
The glass lid is easily damaged.
Arcing may occur between the contacts.
Could be accidentally activated by its ancient magnetic field.
Should be condemned when connected to a logic chip or controller.
This is an overview of reed relays, which are used in different electrical or electronic circuits where smaller, very fast relays are needed. Compared to traditional types of relays, reed relays require less power to activate them and are generally more commonly used in switching applications that require stability and low contact resistance, high insulation resistance and low capacitance, small size and long life. In addition, reed relays can be used to control single or multiple reed switches via electromagnets.
Mall Dynamic
