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Mains Powered Smoke Alarms & Heat Alarms with Self-Charging 10 Year Back-up Battery - BRK 700 Series

Discontinued Product - No Compatible Replacement

The manufacturer has withdrawn from the European market and is no longer supplying compatible alternatives.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 700MRL range is the Aico Ei3000 series.

alternative product

Mains Powered Smoke Alarms with Lithium Back-up Ei3000 Series

  • Available in Optical, Heat, Combined Optical & Heat, and Combined Heat & CO
  • Mains powered alarms with sealed lithium back-up battery
  • AudioLINK technology fitted as standard
  • Interlinks with up to 12 compatible devices
  • Compatible with Ei3000MRF SmartLINK Module for radio-interlinking
  • Suitable for BS 5839-6: 2019 Grade D1 installations
  • Also suitable for both the Welsh and Scottish 2022 legislation

£53.99 inc VAT

£44.99 ex VAT

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Product Overview

Fitted with a sealed lifetime self-charging lithium back-up battery, the BRK 700MRL series of mains powered smoke and heat alarms are Kitemarked to the latest British Standards and have a 5 year manufacturer's warranty. Suitable for installations complying with BS 5839-6 Grade D1, up to 12 BRK mains powered alarms can be hard wire interlinked within a single system, providing early warning of danger.

  • 230V mains powered with lifetime self-charging back-up battery
  • Kitemarked to BS EN 14604 (smoke alarms) and BS 5446-2 (heat alarm)
  • 5 year manufacturer's warranty
  • Please note that BRK and First Alert are no longer manufacturing new stock for the European Market and while the products may have a 2018/19 manufacturing date they still provide a full 10 year lifespan and full warranty cover from date of purchase
  • Suitable for installations complying to BS 5839-6: 2019 Grade D1
  • Three versions available:
    • Ionisation smoke alarm 770MRL responds quickly to fast flaming fires - used in landing areas
    • Optical smoke alarm 760MRL responds quickly to smouldering fires - used in bedrooms, living rooms and hallways
    • Heat alarm 790MRL responds to rate of increase in room temperature - used in kitchens and garages
  • Test and Hush Button Feature (Heat alarms only have Test functionality)
  • A maximum of 12 alarms can be hard wire interlinked
  • Supplied with a push/click style base
  • Please note: Alarms sold separately
  • Product warranty and life commences from date of purchase
  • This alarm is also suitable for the updated 2022 Scottish legislation for fire alarms in homes

Please note: these products are not a direct upgrade from the 660MBX, 670MBX, or 690MBX alarms. Upgrading from a BRK 600MBX series alarm featuring an alkaline battery and twist-on base may require rewiring by a qualified electrician.


The table below shows all the units that can interlink with the BRK mains powered smoke and heat alarms.

Alarms from the Same Series

Model Number Type of unit Type of interlink
770MRL Ionisation Smoke Alarm Hard wire interlink
760MRL Optical Smoke Alarm Hard wire interlink
790MRL Heat Alarm Hard wire interlink
Technical Data
Product Code

770MRL Ionisation Smoke Alarm:  BK770MRL

760MRL Optical Smoke Alarm:  BK760MRL

790MRL Heat Alarm:  BK790MRL

Brand BRK
Back-Up Battery

Self-Charging Lifetime Lithium

Dimensions (HxDia)

BRK 770MRL Ionisation Smoke Alarm: 53x140mm

BRK 760MRL Optical Smoke Alarm: 53x140mm

BRK 790MRL Heat Alarm: 68x140mm

Operating Temperature

+5 °C to +38 °C

Relative Humidity

10% to 85%

Sound Output



BK770MRL: 0.28kg

BK760MRL: 0.34kg

BK790MRL: 0.34kg

Product Datasheets

Customer Reviews

4 customers have given this product an overall rating of 4.8 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: 5 / 5 Stars

Reviewed by:

Great smoke alarm Replaced older versions and the cable entry positions had changed so had to move the position of the smoke alarms by a couple of inches

Published on: 25th May 2018

Rating: 4 / 5 Stars

Reviewed by:

now installed and working - thanks. All seems well so far.

Published on: 10th April 2018

Rating: 5 / 5 Stars

Reviewed by:

Just what I needed The staff were extremely helpful as there was some confusion over the model number of the unit I needed to replace a faulty alarm. Without their assistance I wouldn't have got the correct replacement

Published on: 4th January 2017

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