#reed switch

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

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An electromagnetic switch called a reed switch is used to regulate the flow of electricity in a circuit. They consist of two or more ferrous reeds enclosed in a tiny glass tube-like envelope. When a magnetic field is moved in the direction of the switch, the reeds get magnetized and move together or apart. 

Using a Reed Switch, we can turn a circuit on or off whenever we want. They require no electricity when in their regularly open condition because they operate by simple magnet interaction to open and close their connections. The reed switches are hermetically sealed to allow for usage in practically any environment.

When the two reeds make contact, the switch effectively functions as a gate or a bridge in an electric circuit, allowing electricity to flow around the circuit and operate a device. They are entirely controlled by invisible magnetic fields, unlike mechanical switches, which need something or someone to physically switch them on or off.

Mechanical systems often use reed switches with magnet-activated proximity sensors. Examples include tamper-proofing techniques and door and window sensors in burglar alarm systems. When the lid is closed on a laptop, reed switches have been used to put the device into sleep or hibernation mode.

Tutorial - Reed switch

Reed switch was invented in 1936 by Walter B. Ellwood in the Bell Telephone Labs. Reed Switch consists of a pair of ferromagnetic (something as easy to magnetize as iron) flexible metal contacts typically nickel-iron alloy (as they are easy to magnetize and doesn't stay magnetized for long) separated by only a few microns, coated with a hard-wearing metal such as Rhodium or Ruthenium(Rh, Ru, Ir, or W) (to give them a long life as they switch on and off) in a hermetically sealed (airtight) glass envelope (to keep them dust and dirt free). The glass tube contains an inert gas (An inert gas is a gas that does not undergo chemical reactions under a set of given conditions) typically Nitrogen or in the case of high voltage it is just a simple vacuum.

Reed Switch Market 2019: Global Key Players, Trends, Share, Industry Size, Growth, Opportunities, Forecast to 2024

MarketResearchNest.com adds “Global Reed Switch Market Analysis 2013-2018 and Forecast 2019-2024”new report to its research database. The records spread across 89 with more than one tables and figures in it.

The reed switchcontains a pair (or more) of magnetizable, flexible, and metal reeds whose end portions are separated by a small gap when the switch is open. The reeds are hermetically sealed…