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BRK Mains Powered Smoke Alarms with Lithium Back-up Battery 700 Series

4 Customer Reviews
From: £31.19 inc VAT
£25.99 ex VAT
Product Overview

Fitted with a sealed re-chargeable 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 D, 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 sealed lithium back-up battery
  • Kitemarked to BS EN 14604 (smoke alarms) and BS 5446-2 (heat alarm)
  • Suitable for installations complying to BS 5839-6: 2013 Grade D, E and F
  • 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
  • 5 year manufacturer's warranty
  • 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
  • Alarms sold separately
  • Product warranty and life commences from date of purchase

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

Technical Data

This is the technical data for the BRK Mains Powered Smoke Alarms with Lithium Back-up Battery 700 Series.

Product Code
770MRL - Ionisation Smoke Alarm BK770MRL
760MRL - Optical Smoke Alarm BK760MRL
790MRL - Heat Alarm BK790MRL
770MRL - Ionisation Smoke Alarm 0.28kg
760MRL - Optical Smoke Alarm 0.34kg
790MRL - Heat Alarm 0.34kg
Dimensions (HxDia) BRK 770MRL Ionisation Smoke Alarm: 53x140mm
BRK 760MRL Optical Smoke Alarm: 53x140mm
BRK 790MRL Heat Alarm: 68x140mm
Sound Output 85dB at 3m
Back-Up Battery Sealed long life lithium
Operating Temperature +5 °C to +38 °C
Relative Humidity 10% to 85%

Product Datasheets

The following datasheets are available for this product.

Pricing & Availability

Model Stock Price
770MRL - Ionisation Smoke Alarm
Product Code: BK770MRL
Stock Level:
18 in stock Expected dispatch: Tomorrow

£31.19 inc VAT

£25.99 ex VAT

760MRL - Optical Smoke Alarm
Product Code: BK760MRL
Stock Level:
12 in stock Expected dispatch: Tomorrow

£36.59 inc VAT

£30.49 ex VAT

790MRL - Heat Alarm
Product Code: BK790MRL
Stock Level:
12 in stock Expected dispatch: Tomorrow

£38.99 inc VAT

£32.49 ex VAT

Customer Reviews

4 customers have 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: AL

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: AM

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

Published on: 10th April 2018

Rating: 5 / 5 Stars

Reviewed by: HT

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

Rating: 5 / 5 Stars

Reviewed by: HM

Quick and efficient service,woul recommend

Published on: 13th June 2016

Delivery Options

The following delivery options are available on this product.

Economy Delivery

£4.68 inc VAT - Delivered in 2-3 working days by Hermes

Next Working Day Delivery

£7.80 inc VAT - Delivered the next working day by Hermes

For dispatch today order within

Looking for more information?

If you have any questions or would like more information about this product you can ask one of our specialists.

Direct Telephone 01507 464181
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