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BRK 690MBX Mains Powered Heat Alarms

Discontinued Product - No compatible replacement

Please Note: BRK have withdrawn from the European market and there is no compatible alternative that will fit into your existing system. Since it is not possible to interlink alarms from different manufacturers, new alarms will be needed throughout. The recommended replacement for the whole discontinued BRK 600MBX range is the Kidde Firex series. This will require an electrician to replace your old BRK bases for new Kidde bases.

alternative product

Kidde Firex Mains Powered Alarms with Alkaline Battery

  • 230V mains powered with alkaline back-up battery
  • Available in Optical and Heat versions
  • Interlink with up to 24 units
  • Suitable for BS 5839-6: 2019 Grade D2 installations
  • Kitemarked and CE marked
  • Please note: alarms are sold individually
  • Also suitable for both the Welsh and Scottish 2022 legislation

£23.99 inc VAT

£19.99 ex VAT

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Product Overview

This BRK 690MBX is an identical replacement for your outgoing 690MBX heat alarm, made by the original manufacturer. The new detector head, supplied with a new 9V alkaline back-up battery, fits directly onto your existing base and is guaranteed compatible with your existing system. The box also contains a spare twist-fit base and fixings should you need them.

Like your old 690MBX unit, the replacement is a mains powered heat alarm designed to be installed in kitchens where smoke alarms may be accidentally triggered by normal cooking fumes. It is designed to be simple to install, maintain and use. Hardwire interlink can be made with up to 12 alarms in the range, and mains power is supplemented with a 9V alkaline backup battery.

The simple installation process of the BRK 690MBX replacement alarm removes the need for an electrician, though you must ensure that mains power to all interlinked alarms is cut before beginning work. The interlink wire can carry a live electric current between alarms if they are powered from different circuits.

Technical Data
Product Code BK69RA
Alternative Product Codes 690MBX, BK690MBX
Brand BRK
Back-Up Battery

Replaceable 9V Alkaline

Dimensions (HxDia)

58 x 140mm (including base)

Operating Temperature

+5 °C to +38 °C

Relative Humidity

10% to 85%

Sound Output


Weight 0.31kg
Product Datasheets

Excellent Warranty

This product is supplied with a 5 year manufacturers warranty as standard

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