Glass Reed Switches


$1.30/ each


Inches of glass: 1.09"
Centimeters: 27.8mm



Inches of glass: 0.75"
Centimeters: 20mm






Reed switches for fun and security

These handy devices are used with magnets to detect doors and windows opening. They can also be used for amusement in conjunction with electronic counters, lights, LEDs and other devices.

Glass reed switches are very fragile so please take note:

If you apply heat to the wire it will expand and shatter the glass. What you must do is to hold the wire near to the glass (but NOT touching the glass!) with a pair of "needle-nose" pliers. This will suck heat away before it reaches the wire in the glass. You can then use a very hot iron to quickly "tin" the end of the wire with solder.

Then tinned copper wire can be soldered to the reed switch wires, still using the pliers.

If you need to bend or shorten the reed switch wires (not recommended) you must again grip the wire close to the glass with pliers and bend or cut the wire furthest from the glass. The pliers will prevent any strain on the glass.

Once it's prepared, the reed switch can be glued in place using hot-melt adhesive or similar. If you use Evo-Stick DO NOT let it touch any connections because it corrodes metal.