The D20B 5 Term Above Surface Single Reed Magnetic Door Contact from Knight Fire & Security
is ideal for placement indoors and windows in light-risk domestic or commercial areas.

When wired to an alarm system, these contacts will trigger the sounder if the gap opening exceeds 20mm,
and as the contact creates a circuit to your security system, wire tampering or a forced break of the circuit elsewhere will also sound the alarm.

What is meant by the term Grade 1?
Grade 1 refers to the grade of intruder alarm system you have on the premises, especially if you are depending on the alarm system for insurance cover
in your home or business.
A Grade 1 Alarm basically means Low Risk, Intruders are expected to have little knowledge of the alarm system and may be restricted
to a limited range of easily available tools.

Main Features:
Single Reed Switch Door & Window Contact
Grade 1 Alarm Trigger
15mm Operating Threshold
High Impact Polystyrene Construction

Technical Specification:
Operating Gap: 20mm (Approx)
Materials: High Impact Polystyrene
Magnet: Ferrite or Alnico V
Contact Material: Rhodium
Voltage Range: 100v DC, 125v AC Max
Switching Current: 500mA Max DC, 500mA Max AC
Temperature Range: -40°C - +50°C

1 Year Guarantee Included