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What are Reed Relays?

Reed relays are contact-based electromechanical switching devices used for electrical control and switching. Reed relays are latching, meaning that their switching state remains constant until changed by an external input. Reed relays are used to control the flow of electrical current in digital and analog circuits, in applications ranging from industrial automation to consumer electronics.

Application Field

Reed relays are used in a variety of applications, including medical devices, aerospace electronics, and home appliances. The most common use of reed relays is for digital logic, where a switching control is required for electrical isolation and signal control. They are also used for AC and DC switching applications, as well as for high voltage switching and protection against short circuits. In addition, reed relays are used in automotive, marine, and military applications for providing electrical control that can be remotely switched.

Working Principle

Reed relays are based on a simple principle, whereby two magnetizable blades, or reeds, are sealed in a hermetically sealed glass envelope containing an inert gas such as nitrogen or argon. When an electric current passes through a coil wrapped around the envelope, it creates a magnetic field, which attracts the reeds and causes them to close and form an electrical contact. When the current is removed, the magnetic field dissipates, causing the reeds to open and disconnect the contact. The hermetically sealed glass envelope protects the contacts from environmental influences such as moisture and dust, which can lead to contact corrosion and subsequent failure.

Conclusion

Reed relays are a versatile and reliable switching device that can be used in a variety of applications, from medical equipment to home appliances. Their simple working principle of magnetically controlled reeds inside a sealed envelope make them a reliable and durable switching option. Whether you need to switch high voltage or AC/DC, or control digital logic remotely, reed relays are an ideal choice.

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