Kidde KF20 Mains Optical Sensor Smoke Alarm

In stock
£12.95 £10.79

Kidde optical smoke detector

Product Description


Optical alarms are for use in escape or circulation routes and in areas where there is a danger of ignition of furniture and surroundings by cigarettes producing slow, smouldering fires.


This alarm features:

  • Interlink with up to 23 Firex hard-wired alarms – all alarms sound if danger is detected
  • Alarm memory – identifies source unit within interconnecting network
  • Reduced energy consumption – lower lifetime running costs
  • Combined Test/HushTM button allows regular testing of alarm function and can be used to temporarily silence nuisance alarms
  • Auto reset after activation
  • Tamper-resistant locking device – prevents unauthorised removal without the use of a tool
  • Mains operation – 9V Alkaline back-up battery supplied as standard



Product Details


  • Power Supply: 230V mains-powered with 9V Alkaline battery back-up


  • Temperature Range: 0ºC to + 40ºC


  • Humidity Range: Up to 93% Relative Humidity (RH) non-condensing


  • Alarm Dimensions: 127 x 127 x 39mm


  • Bracket Dimensions: 133 x 133 x 6mm


  • Alarm Weight: 242g


  • Warranty: 6 years


  • Approvals:
    • BSI certified to BS EN14604:2005
    • CE tested and certified


  • Sensor: Optical, circular lateral chamber with insect-resistant width, 9-slot entry portals


  • Chamber Size: 35mm outside diameter x 16mm depth approximate (external)


  • Detection Band: Infrared light wavelength


  • Button Test: Simulates the effect of smoke within the sensing chamber, checks electronics and sounder


  • Automatic Self-test: Circuitry is tested and unit beeps (chirps) if fault is detected


  • Power Consumption: < 15mA


  • Connection: Push-in/snap-fit type connector with 150mm long flying leads (supplied)


  • Power-on Indicator: Continuous green LED


  • Alarm Sounder: Electronic piezo-electric sounder (T3 pattern sound - three pulses - space - three pulses)


  • Sound Output: 85dB (A) minimum at 3 metres


  • Dust Protection: In-built foam gasket in rear of alarm to prevent dust ingress into rear of the alarm


  • Alarm Status:
    • Red LED flashes approx once every five minutes = normal operation
    • Red LED flashes once a second = sensing smoke (sounder alarm sounds)
    • Red LED flashes once every ten seconds = in hush condition (auto-reset after 15 minutes)


  • Interconnection: Up to 24 Firex and Kidde ‘Slick’ units (smoke, heat and CO) can be hardwire interconnected with optional control 


  • Optional Controls: Wired Remote Test and Hush Unit (REMTH) allows test and hush of interlinked units


  • Optional Pattresses: SMK23RU also has integral switchable relay for operating remote devices SMK4896 – Surface mounting base for added ease of installation


  • Fixing: Mounting bracket ring supplied with two ‘T’ slot fitting option 57mm spacing to a maximum of 90mm for standard screw fittings on back boxes 
    Bracket has 50mm diameter central access hole for cabling

More Information
SKU 4973
PRODUCT TYPE Smoke Detector
GTIN 47871259717
Manufacturer Kidde
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Orders placed before 3pm are usually dispatched the same working day. If your items are located outside our main warehouse, we may require 1-2 working days to retrieve and dispatch your items. All orders are shipped using an overnight courier service, we currently use APC and Royal Mail couriers.

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Kidde KF20 Mains Optical Sensor Smoke Alarm