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2332-05-000 Reed Relay Application Field and Working Principle

A reed relay is a type of electrical relay that uses an electromagnet to control one or more reeds, which act as contacts. It was invented in 1835 by Joseph Henry and has been used ever since in many applications. The basic design of the reed relay consists of an enclosure housing a number of reeds, an electromagnet wound around one of the reeds, and a magnetically permeable core surrounding the reeds. When a voltage is applied to the electromagnet, the magnetic field generated by the electromagnet polarizes the reeds, allowing them to move and control some kind of electrical circuit.

The application of reed relays is wide, with technological advancements, they are being used more and more in the development of smart switches, thermostats, and other devices. These relays are durable and have a long lifetime, generally remaining in good working condition for up to one million operations. The low power consumption and small size of reed relays is also an advantage, making them the preferred choice for many applications.

Reed relays can be used to provide a simple switch between two electrical circuits. For example, in home automation systems, a reed relay can be used to control the lighting in a house. When the relay is switched on, the lighting in the house will turn on. Similarly, reed relays can be used to control motors in security systems, appliances like washing machines and refrigerators, and even in medical equipment.

The working principle of reed relays is based on simple physics. When an electric current is applied to the electromagnet, it generates a magnetic field, which polarizes the reeds. This causes the reeds to move and open or close an electrical contact, thus controlling the flow of a current through the circuit. Similarly, when the electric current to the electromagnet is cut off, the magnetic field dissipates and the reeds return to their original position, thus resetting the circuit.

To sum it up, reed relays are commonly used in circuit controlling applications due to their versatility and reliable performance. The fixed contact is polarized by a magnetic field induced by an externally-supplied current, allowing the contact to move and open or close an electrical contact, thus controlling the flow of current through a circuit.

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