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Mains Powered CO Alarm with Rechargeable Lithium Battery Backup - Kidde K4MCO
Ideal for new builds, re-wiring projects and property refurbishments, the Kidde K4MCO is a mains powered carbon monoxide (CO) alarm that can be interlinked by wire with the Kidde Firex smoke and heat alarms. Fitted with a rechargeable lithium back-up battery, the Kidde K4MCO has a 7 year sensor lifespan and provides a warning when the unit has reached the end of it's life.
- Product Lifespan: 7 years
- Power: 230V mains powered with battery backup
- Backup Battery: Rechargeable lithium battery
- Warranty: 7 year warranty
- Suitable for ceiling installation
- CE marked and Kitemarked to BS EN 50291-1
- Can be hard wire interlinked with the Kidde Firex range of smoke and heat alarms
- Sensitivity level: 30ppm (parts per million) CO gas
- Features a test/reset button for regular testing
- Provides end of life warning when the alarm has reached the end of it's life
- Sounds an 85dB audible alarm on activation
- LED display indicates alarm state, power supply status and low battery
- This alarm is also suitable for both the Welsh and Scottish updated 2022 legislation
Customer Reviews
FAQs
Technical Data
Datasheets
Interlink
Customer Reviews (2)
Reviewer
E G
Published on
17th September 2026
Reviewer
Anonymous
Simple to fit. Works well
Published on
26th November 2015
Technical Data
| Product Code | KEK4MCO |
|---|---|
| Brand | Kidde |
| Manufacturer's Part Number | K4MCO |
| Approvals & Markings | CE Marked |
| Back-Up Battery Type | Lithium |
| Colour | White |
| Compliance | BS EN 50291-1 (Domestic) |
| Connection | Wired |
| Display | LED Indicators |
| Environmental Suitability | Home |
| Fixing Options | Ceiling Mounted |
| Installation Position | Ceiling |
| Material | Plastic |
| Operating Temperature | 0°C To +40°C |
| Positioning | Bedrooms |
| Near Fuel Burning Appliances | |
| Power Type | Mains Powered (230V) |
| Product Range | Kidde Firex |
| Recyclable | Yes - Valpak's WEEE Distributor Take-back Scheme |
| Relative Humidity | 5% To 95% |
| Sensitivity | 30ppm (Parts per Million) |
| Sensor Type | Electro-chemical |
| Sound Level | 85dB |
| Warning Type | Audible - Alarm Sounder |
| Warranty | 7 Years |
| Dimensions (Unit) |
|
| Weight | 280g |
Interlink
Alarms from the Same Series
The table below shows all the units that can interlink with the Firex KF Series.
| Model Number | Type of Unit | Type of Interlink |
| KF10 | Ionisation Smoke Alarm | Hardwire interlink |
| KF10R | Ionisation Smoke Alarm with Rechargeable Lithium Cell | Hardwire interlink |
| KF20 | Optical Smoke Alarm | Hardwire interlink |
| KF20R | Optical Smoke Alarm with Rechargeable Lithium Cell | Hardwire interlink |
| KF30 | Heat Alarm | Hardwire interlink |
| KF30R | Heat Alarm with Rechargeable Lithium Cell | Hardwire interlink |
| KF1 | Ionisation Smoke Alarm | Hardwire interlink |
| KF1R | Ionisation Smoke Alarm with Rechargeable Lithium Cell | Hardwire interlink |
| KF2 | Optical Smoke Alarm | Hardwire interlink |
| KF2R | Optical Smoke Alarm with Rechargeable Lithium Cell | Hardwire interlink |
| KF3 | Heat Alarm | Hardwire interlink |
| KF3R | Heat Alarm with Rechargeable Lithium Cell | Hardwire interlink |
Carbon Monoxide Alarms
| Model Number | Type of Unit | Type of Interlink |
| 4MCO | CO Detector with Rechargeable Lithium Cell | Hardwire interlink |
| K4MCO | CO Detector with Rechargeable Lithium Cell | Hardwire interlink |
Compatible Alarms
| Model Number | Type of Unit | Type of Interlink |
| 1239HI | Ionisation Smoke Alarm with Alkaline Battery | Hardwire interlink |
| 1239HILL | Ionisation Smoke Alarm with Lithium Battery | Hardwire interlink |
| 2239HI | Optical Smoke Alarm with Alkaline Battery | Hardwire interlink |
| 2239HILL | Optical Smoke Alarm with Lithium Battery | Hardwire interlink |
| 3239HI | Heat Alarm with Alkaline Battery | Hardwire interlink |
| 3239HILL | Heat Alarm with Lithium Battery | Hardwire interlink |
| 4870 | Ionisation Smoke Alarm with Alkaline Battery | Hardwire interlink |
| 4881 | Ionisation Smoke Alarm with Lithium Battery | Hardwire interlink |
| 4973 | Optical Smoke Alarm with Alkaline Battery | Hardwire interlink |
| 4985 | Optical Smoke Alarm with Lithium Battery | Hardwire interlink |
| 4899 | Heat Alarm with Alkaline Battery | Hardwire interlink |
| 4892 | Heat Alarm with Lithium Battery | Hardwire interlink |
| I240C | Ionisation Smoke Alarm with Alkaline Battery | Hardwire interlink |
| PADC240 | Optical Smoke Alarm with Alkaline Battery | Hardwire interlink |
Mains Powered Smoke Alarms & Heat Alarms with Alkaline Back-up Battery - Kidde Firex KF Series
From: £19.90 inc VAT
£16.58 ex VAT
Mains Powered Smoke Alarms & Heat Alarms with Self-Charging 10 Year Back-up Battery - Kidde Firex KF-R Series
From: £48.68 inc VAT
£40.57 ex VAT
Mains Powered Fire & CO Alarm Control Unit - Kidde
£36.50 inc VAT
£30.42 ex VAT
Replacement for Kidde KF10 Mains Powered Smoke Alarms
£20.80 inc VAT
£17.33 ex VAT
This was a replacement alarm for one we have had for 7 years. It has kept us safe for that long and hopefully this one will do the same.