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Mains Powered Smoke Alarms & Heat Alarms with Alkaline Back-up Battery - BRK 600 Series

Discontinued Product - Compatible Replacement Available

This product has been discontinued, but there is a compatible replacement available.

alternative product

easichange® BRK 660MBX & 670MBX Replacement

  • easichange® replacement alarm kit for BRK 660MBX and 670MBX alarms
  • Optical smoke detector to replace optical and ionisation alarms
  • FREE easichange® tool included with every purchase
  • Quick change guide for easy replacement
  • Fits onto existing BRK baseplate
  • Suitable for BS 5839-6: 2019 Grade D2 installations

£39.95 inc VAT

£33.29 ex VAT

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Product Overview

The BRK 600MBX series of mains powered alarms are available with ionisation, optical or heat sensor and feature a 9V alkaline back-up battery. Kitemarked to the latest British Standards, these BRK mains powered alarms are suitable for installations complying to BS 5839-6 Grade D2 and can be hard wire interlinked to form a smoke alarm system. Once interlinked, if one alarm detects a fire, it sounds and triggers all other interlinked alarms to also sound.

  • 230V mains powered with 9V alkaline back-up battery (included)
  • Kitemarked to BS EN 14604 (smoke alarms) and BS 5446-2 (heat alarm)
  • 5 year manufacturer's warranty
  • Please note that BRK are no longer manufacturing new stock for the European Market and while the products will have a 2018 manufacturing date they still provide a full 10 year lifespan and full warranty cover from date of purchase
  • 690MBX and 660MBX include slimline twist-fit base suitable for flush mounting
  • 670MBX includes push-fit base suitable for flush mounting and surface trunking
  • Suitable for installations complying to BS 5839-6: 2019 Grade D2
  • Available in three versions:
    • Ionisation smoke alarm (670MBX) responds quickly to fast flaming fires - used in landing areas
    • Optical smoke alarm (660MBX) responds quickly to smouldering fires - used in bedrooms, living rooms and hallways
    • Heat alarm (690MBX) responds to rate of increase in room temperature - used in kitchens and garages
  • Test and Hush Button Feature (Heat alarms only have Test functionality)
  • Up to 12 alarms can be hard wire interlinked within a single system
  • Suitable replacement for DETA alarms:
    • DETA 1151 & 1111: BRK 670MBX Ionisation Alarm
    • DETA 1153 & 1113: BRK 660MBX Thermally Enhanced Optical Alarm
    • DETA 1155 & 1115: BRK 690MBX Heat Alarm
  • Please note: alarms are 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: the packaging may show a product code of 770MBX and include a push-fit base but the alarm itself is still a 670MBX, as shown on the sticker on the back of the alarm head, and it is still compatible with existing twist-fit bases.

Please note: for surface-mounted wiring such as trunking the base plate included with these alarms is not suitable; please see the BRK 700 series with push-fit base instead.


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
670MBX Ionisation Smoke Alarm Hard wire interlink
660MBX Optical Smoke Alarm Hard wire interlink
690MBX Heat Alarm Hard wire interlink
Technical Data
Product Code

670MBX Ionisation Smoke Alarm:  BK670MBX-PUSH

660MBX Optical Smoke Alarm:  BK660MBX

690MBX Heat Alarm:  BK690MBX

Brand BRK
Back-Up Battery

9V alkaline

Dimensions (HxDia)

670MBX: 38x133mm

660MBX: 44x140mm

690MBX: 58x140mm

Operating Temperature

+5 °C to +38 °C

Relative Humidity

10% to 85%

Sound Output


Suitable to Replace

670MBX: DETA 1151

660MBX: DETA 1153

690MBX: DETA 1155


BK670MBX-PUSH: 0.27kg

BK660MBX: 0.27kg

BK690MBX: 0.27kg

Product Datasheets
FAQs (1)
Q. Hi, will a BRK 660MBX work in a system with 650MBX?

Yes, the 650MBX is compatible with the rest of the 600 series including the 660MBX.

Customer Reviews

32 customers have given this product an overall rating of 4.6 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: J A

As explained by team easy to install. Very good product information provided.

Published on: 20th December 2020

Rating: 5 / 5 Stars

Reviewed by:

Perfect replacement for the original detector with no wiring required, just clip in and switch power on.

Published on: 7th May 2020

Rating: 5 / 5 Stars

Reviewed by:

Easy to fit

Published on: 16th April 2020

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