9913-05-20

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9913-05-20 Reed Relays: Application field and Working Principle

Reed relays are one of the most commonly used components in many electronic circuits. A reed relay is a type of relay that uses a reed switch and an electromagnet to switch an electrical circuit. It is a form of electromechanical switch and was invented in the 1930s, but has been extremely popular ever since then due to its robustness, reliability, and simple operation. This article provides an overview of the application field and working principle of reed relays.

Application Field

Reed relays are widely used in many industries and applications, typically in circuits requiring low voltage or low current switching. Some applications include:

• Telecommunications, switching telephone lines
• Computers, such as in memory or IO boards
• Medical and security devices
• Test and measurement equipment
• Industrial automation, such as robotics and CNC.

Reed relays are particularly appealing in applications which require a low level of noise, such as in medical equipment and switching telephone lines. Additionally, they are ideal where space is an issue and can be mounted on a PC board, due to their small size. their very low power consumption also makes them attractive in battery operated circuits.

Working Principle

A reed relay consists of a reed switch, an enclosed coil of wire, and other parts. The reed switch is typically a glass tube, closed at one end, with two thin strips of metal, known as reeds, stretched across the tube. The reed switch is sealed in a vacuum or inert gas to prevent corrosion. A permanent magnet is placed near one end of the tube, which attracts one reed towards it. The other reed is connected to an external contact, such as the input of a circuit.

When a small electric current is passed through the wire, it creates an electromagnetic field which attracts the second reed towards it. This brings the two reeds into contact, which in turn enables the currents to flow through the external contact. When the current is removed, the two reeds return to their original position, and the current is stopped.

Reed relays are widely used as they are mechanically simple, and generally offer a robust construction, low operating power, and versatility. Furthermore, they are typically very reliable and require little maintenance. As a result, they are still incredibly popular in many industrial and commercial applications.

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