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Surface Mounted Magnetic Contact/Reed Switch

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Quoting product code: YW47B


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About this product


Product overview

• Protect doors and windows by linking the reed switch and magnet to an alarm system
• Surface mounted with an approximate operating gap of 20mm providing you with a more sensitive security system
• Five terminal contacts

What can I use the reed switch for?
The surface mounted contact reed switch is useful if you want to protect windows and doors whilst you’re away from home. Once linked up to a security system, if an intrusion has occurred (with a gap exceeding 20mm) the alarm will sound.

What does the reed switch do?
When a door or window has been affixed with the surface mounted reed switch and is closed, a circuit is created with the connected alarm system. When you open a door or window (with the alarm system activated) this once completed circuit breaks, sounding the security alarm. This means that even if someone were to cut the wiring that connects the reed switch to the alarm system’s panel, the alarm will still sound.

Where can the reed switch be used?
The distance between the reed switch and magnet can be approximately 20mm before the alarm starts to go off, therefore in order to reduce false alarms it is ideal for you to locate the reed switch and magnet on a relatively flat surface.

What will I need to get this connected to the security system?
In order to get this reed switch connected to your security system you will need a four core alarm cable (for example order code: XR89W) to run from your security system panel to the reed switch.

Underneath the reed switch you will notice five screws which will be for the wires in the alarm cable, three of the screws will be used to make security loops (brass in colour) and two will be used to connect to the reed (silver in colour), establishing an alarm loop.


Specification table
Operating gap 20 mm
Terminal type 5 screws
Mounting type Surface
Switch configuration Normally Closed
Dimensions - Reed Switch 67 mm x 15 mm x 13 mm
Dimensions - Magnet 67 mm x 15 mm x 13 mm
Voltage range (DC) 1 to 100 V
Maximum current (DC) 500 mA
Voltage range (AC) 1 to 125 V
Maximum current (AC) 500 mA
Material High Impact Polystyrene
Weight 24 g
Package contents
Surface reed switch and magnet
Fixing screws

Would these reed switches work if the power supplied was 12v at 1.5A? And if not what is the max amps these CAN take? 

Asked by: Katie
The maximum amperage is clearly displayed on the listing Power Voltage range (DC) 1 to 100 V Maximum current (DC) 500 mA Voltage range (AC) 1 to 125 V Maximum current (AC) 500 mA
Answered by: Les
Date published: 2015-11-19

What is the minimum voltage required for these to work? 

Asked by: Jonnyhd
No minimum has been given we would advise anything over 1v
Answered by: Dominic
Date published: 2015-07-17

What voltage do these work on?

Asked by: Liam
These can be used up to mains voltage of 240VAC but are only designed for very low currents.
Answered by: Russell
Date published: 2015-07-17

Does the reed switch come with wires attached, or does the reed switch case open so wires can be added?
Asked by: Simon Spencer
These have screw connections on the back of the unit.
Answered by: RW
Date published: 2015-07-17

Could this reed switch operate at 0-20v 1 amp?
Asked by: Garth
No sorry this product does not support that.
Answered by: TJ
Date published: 2015-07-17

please can you order these switches to be not closed so when using magnet it opens the switch thanks
Asked by: sid
No sorry this product does not support that.
Answered by: DH
Date published: 2015-07-17

Could this surface reed switch be used as a door exit contact for an alarm system. The door is UPVC. I have wiring in place so are wires attached to the unit via screws?
Asked by: Jonathan
Reed switches are designed for use in alarm systems and therefore it should be fine
Answered by: PS
Date published: 2015-07-17

Will these switches handle a load of up to 14VDC at 155mA
Asked by: Malcolm
No sorry this product does not support that.
Answered by: CF
Date published: 2015-07-17
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