How Does A Reed Switch Work?

 The reed switch is a simple yet complex device; it operates on basic mechanics which at the same time lead to amazing results. These switches are one of the switch types that consist of a gap made of two elastic metal reeds inside a sealed glass bulb containing inert gas. Let us scrutinize through a microscope how a reed switch is built:

Magnetic Attraction


At the core of a reed switch lies its ability to respond to magnetic fields. When a magnet approaches the switch, it induces a magnetic field that magnetizes the reed contacts. As a result, the reeds are drawn towards each other, overcoming the slight tension holding them apart.

Closure of the Circuit


The magnetic attraction between the reeds causes them to come into contact, closing the switch. This closure completes the electrical circuit, allowing current to flow through the switch and any connected components. Conversely, removing the magnet causes the magnetic field to dissipate, allowing the reeds to spring back to their original positions and open the switch, interrupting the flow of current.

Reed Contact Configuration


The configuration of the reed contacts determines the behaviour of the switch:

Normally Open (Form A):


In this configuration, the switch remains open in the absence of a magnetic field. When a magnet is brought near, the contacts close, completing the circuit.

Normally Closed (Form B):


Conversely, in this configuration, the switch is normally closed. It opens when exposed to a magnetic field, breaking the circuit.

Sensitivity and Actuation


The sensitivity of a reed switch refers to the strength of the magnetic field required to actuate it. Factors such as the distance between the magnet and the switch, as well as the strength of the magnet itself, influence the sensitivity and actuation of the switch.

Advantages of Reed Switches


Reliability: With no mechanical parts to wear out, reed switches offer long-term reliability.

Compact Size: Their small size enables easy integration into space-constrained environments.

Low Power Consumption: Reed switches require minimal power to operate, making them suitable for battery-powered devices.

Fast Response Time: They exhibit rapid response times, crucial for high-speed switching applications.

Conclusion


In conclusion, reed switches stand as indispensable components in modern electronics, offering reliable and efficient switching solutions across diverse applications. At Millennium Semiconductors, a renowned distributor of electronic components and semiconductors, we offer a comprehensive range of high-quality reed switches. Our dedication to meeting the varied needs of our customers underscores our commitment to excellence in the field of electronic components.

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