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Replacement for BRK 770MBX Mains Powered Smoke Alarm

Discontinued Product - No Compatible Replacement

This product has been discontinued.

alternative product

Kidde Firex Mains Powered Alarms with Alkaline Battery

  • 230V mains powered with alkaline back-up battery
  • Available in 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 both the Welsh and Scottish 2022 legislation

£21.00 inc VAT

£17.50 ex VAT

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Product Overview

The BRK 770MBX smoke alarm with push-fit base is no longer available for sale. This replacement alarm is identical in every way to your outgoing unit, fits directly onto your existing base, and is guaranteed to be compatible with your existing system. The BRK 670MBX smoke alarm head in the box is in fact the very same as the 770MBX you are replacing.

This BRK 670MBX / 770MBX is an ionisation smoke alarm ideal for landings areas and detects fast flaming fires quickly. The 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-made replacement 6/770MBX alarm heads
  • 230V mains powered with 9V alkaline back-up battery (included)
  • CE and Kitemarked to BS EN 14604: 2005
  • Fits onto your existing BRK push-fit alarm base (additional base included to keep as a spare)
  • Interlink with up to 12 compatible alarms in your current system
  • Combined Test & Hush button feature
  • Manuacturer's 5 Year Warranty
  • Product warranty and life commences from date of purchase

The simple installation process of the 770MBX replacement alarm removes 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 BK77RA
Alternative Product Codes BK770MBX, 770MBX, BK670MBX, 670MBX, 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

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