Kiddie Optical Smoke Detector 9v Back Up

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€30.08 €24.86
Quick Overview

Mains-powered optical smoke alarm that can be interlinked with up to 23 other Kidde mains alarms, be they ionisation, optical or heat. Once interlinked, the detection of the relevant danger by an individual unit will sound across all the connected alarms.

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  • 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
  • Dust compensation and bug screen – reduces nuisance alarms
  • 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


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 mains-powered unit should be installed by a qualified electrician and can be used throughout the home, except in the kitchen where a Firex Heat Alarm is recommended. These alarms comply with UK Building Regulations for new housing and associated standards (Grade D BS 5839, Part 6).



Model KF20
Power Supply 230V mains-powered with 9V Alkailine battery back-up
Temperature Range 0ºC to +40ºC
Humidity Range Up to 93% Relative Humidity (RH) non-condensing
Storage and Transport -20ºC to +60ºC and 5–95% 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 slot entry portals and added bug screen mesh
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
Supply Voltage 230V AC, 50 Hz (nominal UK voltage)
Power Consumption < 15mA
Connection Push-in/snap-fit type connector with 150mm long flying leads (supplied)
Battery Back-up User-replaceable alkaline 9V battery (522/6LR61)
Power-on Indicator Continuous green LED
Alarm Sounder Electronic piezo-electric sounder (T3 pattern sound - 3 pulses - space - 3 pulses), soldered contacts
Sound Output 85dB (A) minimum at 3 metres
Alarm Frequency 3.2 kHz typical
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 (see below)
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
Plastics used NORYL – Cover, main body and mounting bracket
Lead-Free Status All Firex alarms are lead-free


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