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Recessed Magnetic Contact/Reed Switch

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Quoting product code: YW46A


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About this product


Product overview

• Protect wooden windows and doors with the supplied reed switch and magnet
• Installed in a recessed hole for a hidden magnetic switch with an operating distance of 15mm
• Comes pre-wired with four wires that are 305mm long for a simpler installation compared to traditional screw terminal magnetic contacts

Would this contact be a great choice for me?
A recessed magnetic contact that can be used as a hidden sensor for your alarm system. Activates an alarm when the gap between the reed switch and magnet exceeds 15mm, providing you with a sensitive magnetic contact.

What can I do with the magnetic contact/reed switch?
The recessed magnetic contact can be used in conjunction with a security system to help sense when an intruder has opened a door or window. Thanks to the component being recessed into a wooden door or window it would not be spotted until it is too late. Also since the operating gap of the magnetic contact is 15mm, it is best to locate it at a window or door that is close to it's frame and is not loose. Otherwise you may experience an abnormal amount of false alarms.

Do I need anything else to connect this to my security system?
Due to this magnetic contact being recessed mounted it does require a hole to be drilled into both the window or door and it's frame, with an additional hole needed to run the wires out. An alarm cable (e.g. Order Code: XR89W) is needed to connect this component to your security system's control panel, with a junction box also needed to connect the two together.


Specification table
Operating gap 15 mm
Terminal type 4 wire 305 mm cable
Main body dimensions: 27.5 x 8mm dia.
Switch configuration Normally Closed
Dimensions - Reed Switch N/A
Dimensions - Magnet N/A
Dimensions - Recess 28.5 mm x 15 mm (dia)
Dimensions - Flange 16 mm (dia)
Voltage range (DC) 1 to 100V
Maximum current (DC) 500 mA
Voltage range (AC) 1 to 125V
Maximum current (AC) 500 mA
Material High Impact Polystyrene
Weight 12 g
Package contents
Flush reed switch and magnet

I'm using one of these in an Arduino project. I've notice that the reliability of the switch has dropped considerably in the last couple of days. This is used in an uninsulated garage - could this be related to the recent colder weather?

Asked by: cuperman
This service is for frequently asked questions and does not allow two way communication, In order for us to best assist you with your technical issue please contact us on the details below: 0333 400 9500 or email
Answered by: Darren
Date published: 2016-11-07

What's the purpose of the 4 wires? I can see that two of them are to pass through the reed switch and to connect when the reed switch closes, but what are the other two for please?

Asked by: Berni
Unfortunately we no longer stock this item as it has been discontinued from our range. Therefore we are unable to obtain any further in-depth
Answered by: Dominic
Date published: 2016-06-24

can the reed switch be used to sound a bell when the door is opened?
Asked by: mr r down
Yes the product does support that.
Answered by: CF
Date published: 2015-07-17

can this reed switch be powered by a standard battery, when put into a small circuit?
Asked by: chrissmith
Yes the product does support that.
Answered by: LC
Date published: 2015-07-17

Can this reed switch be powered by 220 V to feed a 1A lamp?
Asked by: Özlem Dede
No sorry this product does not support that.
Answered by: JK
Date published: 2015-07-17

Could you run 12v from a transformer through this to power a few LEDs (total 5w) in a cupboard, so that they come on when the door is opened?
Asked by: Michael
Yes the product does support that.
Answered by: CF
Date published: 2015-07-17

What is the current that can be put through this reed switch.
Asked by: Sean
approximatly 200ma
Answered by: DM
Date published: 2015-07-17
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