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Replacement for BRK 670MBX Mains Powered Smoke Alarm

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 770MBX alarm contains an identical replacement alarm head for your outgoing BRK 670MBX ionisation smoke alarm which uses replaceable alkaline batteries. The only difference is that the spare base supplied is a push-fit version rather than the twist-fit you already have installed. This replacement detector head fits directly onto your existing twist-fit base and is guaranteed to be compatible with your existing system.

The supplied 670MBX / 770MBX is an ionisation smoke alarm ideal for landings areas and detects fast flaming fires quickly. 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.

  • Genuine BRK 670MBX replacement ionisation smoke alarm head
  • 9V alkaline backup battery (included)
  • CE and Kitemarked to BS EN 14604: 2005
  • Fits onto your existing BRK twist-fit alarm base (spare push-fit base included)
  • Suitable for installations complying to BS 5839-6: 2019 Grade D2
  • An interlinked system provides the earliest possible warning of fire
  • Test and hush button feature
  • Manuacturer's 5 Year Warranty
  • Product warranty and life commences from date of purchase

The simple installation process of the 670MBX / 770MBX 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 BK67RA
Alternative Product Codes BK670MBX, 670MBX, BRKEOA, BK670MBX-PUSH
Brand BRK
Back-Up Battery

Replaceable 9V Alkaline

Dimensions (HxDia)

38 x 133mm

Operating Temperature

+5°C to +38°C

Relative Humidity

10% to 85%

Sound Output



5 years

Weight 0.27kg
Product Datasheets

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 5 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 D

Very good item. No need to replace the base as the new one clipped in very good.

Published on: 2nd June 2021

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