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Mains Optical Smoke Alarm - Kidde Firex 4973

£21.27 ex VAT
From: £18.27 ex VAT
(£21.92 inc VAT)
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Kidde Firex 4973 and 4985's are mains powered, interconnectable optical smoke alarms. The 4973 has an alkaline battery back-up and the 4985, a rechargeable lithium battery back-up.  The units are hard wired and can be interconnected with other units from the series to create all round fire protection within the home.
  • 230V Hard-wired smoke alarm
  • Optional alkaline or rechargeable lithium back-up battery versions
  • 6 year warranty
  • A maximum of 24 units can be interconnected via signal cable
  • Kitemarked to BS EN 14604:2005 - view the certificate
  • Fully conforming to BS 5839-6:2004 Grade D, E and F
  • CE marked
  • LED indicator
  • Test / Hush button
  • Low battery warning chirp
  • Supplied with dust cover (to protect unit temporarily if you carry out dusty work)

Please Note: The Kidde Firex 4973 and 4985 are replacements for the Kidde 2239HI and 2239HILLs and can be interconnected, however the new models cannot be used on the same base plates and use different connector blocks.
The table below shows all the units that can interconnect with the KE4973 and KE4985.

Alarms from the same series
Model Number
Type of unit
Type of interconnection
KE4870 Ionisation Alarm Hard wire interconnection
KE4881 Ionisation Alarm with Rechargeable Lithium Battery Hard wire interconnection
KE4899 Heat Alarm Hard wire interconnection
KE4892 Heat Alarm with Rechargeable Lithium Cell Hard wire interconnection
Compatible Alarms
Model Number
Type of unit
Type of interconnection
KE1239HI Ionisation Alarm with Alkaline Battery Hard wire interconnection
KE1239HILL Ionisation Alarm with Lithium Battery Hard wire interconnection
KE2239HI Optical Alarm with Alkaline Battery Hard wire interconnection
KE2239HILL Optical Alarm with Lithium Battery Hard wire interconnection
KE3239HI Heat Alarm with Alkaline Battery Hard wire interconnection
KE3239HILL Heat Alarm with Lithium Battery Hard wire interconnection

This is the technical data for the Mains Optical Smoke Alarm - Kidde Firex 4973.

Dimensions (HxWxD) 133x133x38mm
Sound Output 85dB (minimum) at 3m
Temperature Range 5 to 40°C

Technical Data Sheets

The following technical data sheets are available for this product:

Pricing & Availability

Model Stock Levels Prices Weight
Kidde 4973 Alkaline Battery Backup
Product Code: KE4973
In Stock

£18.27 ex VAT

(£21.92 inc VAT)

0.4kg
Kidde 4985 Rechargeable Lithium Battery Backup
Product Code: KE4985
In Stock

£26.16 ex VAT

(£31.39 inc VAT)

0.4kg
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Customer Reviews

19/Feb/2012
Reviewed by:
Excellent product and does not go off when cooking like the old alarm did. Very easy to replace old alarm.
10/Feb/2012
Reviewed by:
24/Nov/2011
Reviewed by:

Not Rated

20/Sep/2010
Reviewed by:
Excellent product,excellent instructions enclosed.
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