9001-05-10

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Reed Relays

Reed relays are an electronically operated switch used mainly in circuitry where only low power is being switched. The relay consists of an electromagnet which contains an armature and two sealed reed contacts. When a voltage is applied to the relay, current flows through the electromagnet, producing a magnetic field which causes the armature to be pulled in and closes both the reeds. This is the same principle that is used in a standard electrical relay and has many of the same advantages, including long life and reliability.

9001-05-10 Application Field and Working Principle

Reed relays are used in many everyday applications in electronics, such as communication systems, security systems, and automation systems. They are also used in industrial-level equipment such as medical equipment, instrumentation, or specialized industrial components. They are also used in safety-critical and mission-critical systems, as they provide reliable switching and long life.

Reed relays are operated when an external DC voltage is applied to it. This voltage flows through the electromagnet which activates the armature. The armature then moves and makes contact with the two reeds that are sealed inside the relay, thus closing the circuit. This is the basic principle on which the reed relay operates.

Benefits of Reed Relays

Reed relays offer several advantages over standard electrical relays. Firstly, they have a much smaller size, making them ideal for automated or space-limited designs. Additionally, their construction has no moving parts, resulting in lower power consumption than standard relays. This means that they require much less energy to operate.

Reed relays also offer a much longer life than traditional electrical relays. Additionally, they have a much higher speed compared to other types of mechanical relays, which makes them suitable for high-speed applications. Finally, they are more reliable than other larger and more expensive components such as power contactors.

Limitations of Reed Relays

Reed relays have some limitations as well. They are limited in terms of the amount of current they can carry as they are intended to switch low power applications. Additionally, their small size limits their contact force and makes them vulnerable to external magnetic fields, which can affect their performance. Finally, their lifetime is affected by contact welding, which can occur when there is a significant difference in the polarity of the voltages applied to the relay.

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