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Replacement for BRK 660MBX & 670MBX Mains Powered Smoke Alarms

Discontinued Product

The manufacturer has withdrawn from the European market and is no longer supplying compatible alternatives. Since it is not possible to interlink alarms from different manufacturers, the recommended replacement for the whole discontinued BRK 600MBX range is the Kidde Firex series.

alternative product

Kidde Firex Mains Powered Alarms with Alkaline Battery

  • 230V mains powered with alkaline back-up battery
  • Available in Ionisation, 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 the 2022 Scottish legislation

£17.75 inc VAT

£14.79 ex VAT

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Product Overview

This BRK 660MBX is a direct replacement for your outgoing BRK 660MBX optical or 670MBX ionisation smoke alarms which use replaceable alkaline batteries. Optical smoke detectors such as the 660MBX are largely replacing the older ionisation smoke detection technology and are better at detecting slow, smouldering fires. The 660 and 670 alarms use the same base so your new alarm is guaranteed to fit and be compatible with your existing system.

The supplied BRK 660MBX is a thermally enhanced optical smoke alarm ideal for most rooms in the house such as hallways, living rooms, bedrooms, and landings, including rooms that are usually covered by traditional ionisation alarms. This alarm features a central test and hush button making maintenance very easy while a replaceable 9V alkaline backup battery ensures that it continues to operate even during a power failure, so you are never without protection.

The simple installation process of the 660MBX replacement alarm negates the need for an electrician, though you must ensure that mains power to all interlinked alarms is turned off 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 BK66RA
Alternative Product Codes BK660MBX, 660MBX, BK670MBX, 670MBX, BRKEOA
Brand BRK
Back-Up Battery

Replaceable 9V Alkaline

Dimensions (HxDia)

44 x 140mm (including base)

Operating Temperature

+5 °C to +38 °C

Relative Humidity

10% to 85%

Sound Output


Weight 0.27kg
Product Datasheets

Key Product Features

Perfectly replaces both the 660MBX optical and 670MBX ionisation detector models

The 660MBX will interlink with your remaining BRK alarms

Piercing 85dB alarm sounder

Made by the original alarm manufacturer

What's Included?

Every BRK BK66RA is supplied with the following components.

  • 1 x BRK 660MBX optical alarm
  • 1 x Spare twist-fit base
  • 1 x 9V replaceable alkaline battery
  • 1 x Screw fixing set (screws & rawl plugs)
  • 1 x Instruction manual

Excellent Warranty

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

Customer Reviews

1 customer has given this product an overall rating of 4 out of 5

Reviews by real customers

All of our product reviews are written by real customers that have purchased this product from us and are published without modification.

Rating: 4 / 5 Stars

Reviewed by: A D

Does what it says on the box and straight forward to install

Published on: 21st September 2020

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