Knight Flush Magnetic Door Window Contact - Brown (A40B)

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Key Features:

  • Brown
  • Indoor Flush Mount
  • Grade 1

Knight are the market leading UK manufacturer of wired magnetic contacts.  Magnetic Contact Detectors can easily be added to your wired alarm system using as little as 2 core cable.  Ideal for protecting doors, windows, cupboards and drawers. These detectors will activate your alarm system immediately once the contact is separated from the magnet, i.e. when a door is opened.

The A40B is a basic 5 screw flush contact.  Two nickel screws to govern the reed switch and 3 spare brass screws for any custom requirements.


  • Brown
  • Indoor
  • 5 screw terminals
  • Operating gap up to 14mm
  • Grade 1
  • Dimensions: 20mm diameter,  x 13mm deep
  • Plate Dimensions: H 22mm x W 36mm x D 2.2mm
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Manufacturer Code A40B