Reed switch encapsulated door sensor or window sensor magnetic MC-38 security contact alarm sensor ORIGINAL


Sold: 10

encapsulated reed switch
with magnet
sold as a pair of switch + magnet
with mounting holes and double sided tape
good for detecting if a door /window is open or closed
also good for proximity sensing
tested on a project where it is used for measuring speed for vehicle by installing these on the wheels and counting rpm calculated with wheel circumference
commonly used with arduino, rpi, esp8266, etc.

In Stock



This Magnetic Door Switch Set is a magnetic sensor alarm which control the switch of the circuit via built-in magnet. These types of switches are primarily used in home security systems. One half of the assembly set on a window or door frame and the other attached to the window or door itself.

Material: ABS
Dimension: Approx. 27 x 14 x 8(mm)
Switch pattern: N/C normally closed, alarm-on-broken
Voltage: 100V DC
Rated power: 10W
Actuation Distance: 15-25mm
Wire lead: 24 AWG, about 300mm long
Mounting method: SMD (by screws or double-sided tapes)

There are two types of reed switches: ”normally open” reed switches and ”normally closed” reed switches. The metal reeds on a normally open switch stay open when there is no magnet near the switch. In the presence of a magnetic field, the contacts of a normally-open reed switch will close. A normally-closed reed switch is closed when it is not near a magnet; as a magnet is brought close to it, a normally-closed switch will open.


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