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Reed coil Moreover, these relays provide a high degree of reliability and longevity, owing to the enclosed design that protects the reed switch from environmental factors. The reed switch, housed within a glass envelope, serves as the core of the relay, and the coil is responsible for generating the magnetic field necessary for switching. Reed Relay Construction The reed relay switch is a sealed glass envelope that includes two reed blades which are made with magnetically sensitive based material like ferromagnetic material. Get your basket off to a great start. They contain a reed switch, a coil for creating a magnetic field, an optional diode for handling back EMF from the coil, a package and a method of connecting to the reed switch and the coil to outside of the package. Various widths available to complete your DIY crafts. The primary components of a