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Reed relays are an important type of electrically operated device commonly used in control and circuits where low-power signals need to be controlled. They were first invented in the United States in 1929. The components in this type of relay are a reed switch and a coil of wire, usually made of copper. The relay works by the energizing of the coil, which moves the reed switch to the on position. This closes the circuit, allowing current to flow, and thus establishing the connection. The reed switch is so designed that when the energizing current is removed, the switch returns to the off position, thus stopping the current flow.

Reed relays provide a single-pole, single-throw (SPST) contact switch, making them an ideal choice for applications that require frequent switching. Additionally, they offer a much longer life than mechanical switches, which is another contributing factor to their popularity. In addition, reed relays are much smaller than their mechanical counterparts and offer higher current and voltage ratings.

Reed relays can be used in environments where temperature, humidity or other types of environmental factors must be monitored. Examples include alarm systems, industrial process control, and computer telecommunications equipment. In addition, reed relays can be used as input and output devices in controlling equipment operated by computers and other types of controllers.

Due to the fact that reed relays are small, they are very easy to mount on a printed circuit board. Additionally, they are relatively inexpensive and can be easily replaced if they become faulty. Finally, reed relays are highly reliable and can usually tolerate high levels of vibration and shock.

The working principle of a reed relay is simple. When an electromagnetic field is created around the relay, typically from an electric current, the reed switch opens or closes, depending on the direction of the current. When the signal to the relay is switched off, the reed switch closes again, completing the switch circuit. The contact area of the reed switch is also protected from corrosion, making them an ideal choice in applications where mechanical switches can become unreliable.

Reed relays can be used in applications such as contactors, motor controls, and power supplies. They are also used in telecommunications equipment as well as computer and audio applications. Relays used in these applications must be able to operate over wide temperature ranges, and have high reliability and low power consumption. Reed relays provide all of these features.

Reed relays offer a number of advantages over other types of relays. The small size means they can be incorporated into most electrical systems, while their low power consumption makes them ideal for battery-operated applications. Additionally, reed relays are generally more reliable than mechanical relays, thanks to the protection offered by the contact area of the reed switch. Finally, reed relays can be mounted directly onto a printed circuit board, making them an economic solution in most applications.

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