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Reed Switch Usage Frequently Asked Questions

- May 22, 2018 -

Under what circumstances is a copper-plated reed switch used?

The reeds of most reed switches use copper and silver, nickel/iron, and when compared with relatively high current withstand, this is no problem most of the time. However, when the reed switch passes high current, either DC or AC will increase the temperature. When the heat reaches a certain level, the nickel/iron will lose ferromagnetic. Therefore, due to excess heat, the relay coil or magnet contact will not allow the contacts to close properly. In order to solve this problem, a dry reed with 50-100 μm copper plating will increase the electrical conductivity and solve the above problems.


Why do reed reeds require nickel/iron and 52% nickel?

The magnetic field only affects ferromagnetic metals. Nickel and iron are ferromagnetic. 52% of nickel is critical because its coefficient of thermal expansion exactly matches the expansion rate of the glass.


How do two reed switches have different operating OATs?

When two identical magnets are operated close to different reed switches, the smaller one is running in a more sensitive magnetic field and will be closed first. When an application needs to run only within a specific distance, it is flexible to release the reed switch, and the reed switch with a "L" indicates low release.


Reed switch under what conditions the reed will pull?

In both cases, a permanent magnet is used: the basic operation of the reed switch under the magnetic field generated by the permanent magnet, the two reeds are of opposite polarity and generate enough suction force between the two reeds to contact each other. Use the additional coil: place the reed switch in the center axis of the coil. The magnetic field is the strongest in this part. The two dry reeds are of the opposite polarity and generate enough suction force between the two reeds to touch each other.


What is the difference between different release amps (RATs) for two reed switches?

When two identical magnets move away from the two closed reed switches with the same operation, but different versions, later versions, that are sensitive to magnetic fields, will open first.


What are the advantages and disadvantages of using the <20 Ampere (AT) Reed Switch?

Advantages Disadvantages

The magnetic field is very sensitive to low impact and vibration

A very low contact gap can act like a capacitor

The magnet can start from a farther place with a lower breakdown voltage

Reduce operating time Higher contact resistance


What are the advantages and disadvantages of using > 20 Ampere (AT) Reed Switches?

Advantages Disadvantages

It is possible to use larger magnets to reach the proper magnetic field strength.

Higher resistance to shock and vibration requires the use of stronger magnets

Do not accept stray magnetic fields Magnets need to be closer to actuation

Can switch higher voltage and current Higher operating time


How to connect to switch contact rated voltage and switch current?

Switching voltage and switching current should not exceed its maximum rated value. The product of the current should not exceed the maximum contact rating watt.

What is the reed switch seal?

Seal seals are considered to have 3 types:

Glass seal

Glass metal

Metal to metal seal

In these seals is meant having zero porosity, ie no leakage at the molecular level.

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