9001-05-02

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Reed relays are contactless electrically operated switches used for switching electrical circuits. They are the oldest type of relay, and were invented in 1835. As their name suggests, reed relays consist of a pair of contacts, which are sealed in a hermetically sealed metal tube, connected to an electro-magnet. When the relay is activated, the contacts are pulled together by the magnetic field, closing the circuit.

Reed relays are widely used in a variety of applications, such as automotive, aerospace, industrial, and consumer electronics. They can also be used in signal processing, data transmission, and telecommunication. The 9001-05-02 application field and working principle of reed relays may be divided into two categories: electromagnetic and electrochemical.

Electromagnetic Reed Relays: Electromagnetic reed relays are the simplest type of reed relay. They use a small permanent magnet, typically a ferrite core, to create a magnetic field. When the relay is activated, an electric current is sent through the magnetic field, producing a magnetic force that pulls the contacts together. This type of reed relay is well-suited for high-speed switching applications, such as in communication and protection systems.

Electrochemical Reed Relays: Electrochemical reed relays use a chemical reaction to produce a force that pulls the contacts together. These types of reed relays typically use a pair of electrolytes, which, when an electrical current is sent through them, produce a chemical reaction that creates a force strong enough to pull the contacts together. This type of reed relay is ideal for use in applications where accuracy and precision are critical, such as medical and dental technology.

In addition to application and working principle, reed relays are also classified according to their size and shape. The most common type of reed relay is the single pole double throw (SPDT). These relays have two sets of contacts: one that is normally open, and one that is normally closed. When the relay is activated, one set of contacts is closed and the other is opened, creating an on-off switching effect. Other types of reed relays include double pole single throw (DPST) and double pole double throw (DPDT) relays, which have four and six contacts, respectively.

Reed relays are reliable, low-cost switches that are used in a wide range of applications. They offer fast switching, high current handling capacity, and are available in a variety of sizes and shapes. They are also ideal for use in applications where accuracy and precision are critical.

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