Kidde KF20R Mains Powered Optical Smoke Alarm with Rechargeable Back-Up Battery

The Kidde Firex KF20R is a 230V mains-powered optical smoke alarm with a built-in rechargeable lithium back-up battery, so there is no back-up battery to replace during the alarm's life. It can be hard-wire interlinked with up to 23 other Kidde Firex mains alarms (optical, ionisation or heat), so that when one unit detects danger every connected alarm sounds. Optical alarms are recommended for escape routes, hallways, bedrooms and living areas where slow, smouldering fires are a risk; Kidde recommends a Firex heat alarm for kitchens.

Key features

• Interlinks with up to 23 Firex hard-wired alarms; all alarms sound when danger is detected
• Alarm memory identifies the source unit within an interconnected network
• Optical sensor with dust compensation and bug screen to reduce nuisance alarms
• Combined Test/Hush button for routine testing and temporary silencing of nuisance alarms
• Automatic reset after activation
• Tamper-resistant locking device prevents removal without a tool
• Sealed-in rechargeable lithium back-up battery (not user-replaceable)
• Automatic self-test: the unit chirps if a fault is detected

Technical specifications

• Model: KF20R
• Power supply: 230V AC, 50Hz mains with built-in rechargeable lithium battery back-up
• Sensor: optical, with dust compensation and bug screen
• Sound output: 85dB(A) minimum at 3m; alarm frequency 3.2kHz typical
• Alarm pattern: temporal T3 (three pulses, pause, three pulses)
• Power consumption: <15mA
• Connection: push-in/snap-fit connector with 150mm flying leads (supplied)
• Indicators: continuous green LED (mains on); red LED for status, alarm and hush (hush auto-resets after 15 minutes)
• Fixing: mounting bracket with 57mm to 90mm screw spacing for standard back boxes and a 50mm central cable access hole
• Dimensions: 127 x 127 x 41mm
• Weight: 246g (including battery)
• Operating temperature: -10°C to +40°C
• Humidity: up to 93% RH, non-condensing
• Storage and transport: -20°C to +60°C, 5–95% RH non-condensing
• Approvals: BSI certified to BS EN 14604:2005
• Alarm grade: D1
• Product life: 10 years
• Warranty: 6 years