BRK 690MBX Mains Heat Alarm with 9V Battery Backup Product Code: 4102G

240V. Mains powered with 9V battery backup providing power in the event of failure. Suitable for use in kitchens and garages. Interlinkable with up to 12 smoke/heat alarms.


  • 240V AC Mains & Battery-Powered
  • 85dB Alarm
  • Power Indicator
  • 5 Year Manufacturer's Guarantee (T&Cs Apply)
  • Single Button Test & Silence Function
  • Mounting Plate Included


1 x 9V PP3 Battery Supplied. BS 5446-2: 2003.
Additional Information
Technical Specification
  • Power Source : Mains & Battery-Powered
  • Brand : BRK
  • Product Type : Mains Heat Alarm with 9V Battery Backup
  • Sound Pressure Level : 85 dB
  • Alarm Product Type : Heat
  • Model Name : BRK 230V Mains Heat Alarm with 9v battery backup
  • Fixings Supplied : Fittings Supplied
  • Current Type : AC
  • Total Product Weight : 0.270 kg
  • Model No : 690MBX
  • Battery Duration : Replacement Battery (Alkaline)
  • Wireless/Wired : Wired
  • Alarm Sensor Type : Thermistor
  • Battery Type : 9V
  • Colour : White
  • Pack Size : 1
  • Power Voltage Supply : 240 V
  • Manufacturer Guarantee : 5 Year Manufacturer's Guarantee (T&Cs Apply)
  • Pieces in Pack/Case : 1
Product Contents
690MBX, mounting plate and 9V battery.
Delivery & Returns


Standard delivery: €15

Free delivery on all orders over €70.00

Click here to see information on our delivery charges and times



Hopefully you won't need to return an item, however, if you do, it is our aim to make this as simple as possible. By following the guidance below you can help us to help you when a product is not what you expected, or is faulty. Your statutory rights are not affected by this guidance.


Click here to see information on returns and cancellation

€30.45 Incl. 20% VAT

Add to Wishlist

More Items to Consider

Loading... Loading...
BRK 690MBX Mains Heat Alarm with 9V Battery Backup is rated 4.0 out of 5 by 11.
Rated 5 out of 5 by from Really good product. Easy installation!!!!! Solid construction with good guidance notes.
Date published: 2017-07-03
Rated 5 out of 5 by from Easy peasy Easy to install and neat. Nothing more to say about a heat detector.
Date published: 2017-06-29
Rated 4 out of 5 by from smoke alarm Bought as a replacement,as old one still worked ,bur discoloured as over twenty years old
Date published: 2017-02-18
Rated 1 out of 5 by from Colour Mismatch I recently purchased the BRK 660MBX and BRK 690MBX detectors together with the surface mounting pattress. Firstly the pattress is white and the detectors are a greyish / beige colour and do not match. In fact they look rather ugly. Whilst the pattress makes for ease of wiring it does make the unit look rather large. After investigation I purchased the BRK 760MBX and BRK 790MBX detectors. These have an integral mounting plate for easy connection and look much better than the 660 and 690 options. The units are about the same price so using them is a no brainer.
Date published: 2016-07-02
Rated 5 out of 5 by from It works! Does what it should, really easy to install using Wago connectors. Easy to link to matching smoke alarm in hallway.I found it easy enough without the optional base plate, which adds about another inch and a half of ugliness. why can't any manufacturer make this type of alarm attractive?
Date published: 2016-05-30
Rated 4 out of 5 by from Neads jb Good product that is easy to fit , the only down side is that you nead a jb as well to fit it
Date published: 2015-12-29
Rated 5 out of 5 by from Good basic safety kit Good item matches and links to equivalent smoke alarm, Size is good not being too large. Easily Fitted and assuming screwfix continue to stock it then will be easy to replace if required due to baseplate. Decent price.
Date published: 2015-12-15
Rated 5 out of 5 by from Smoke alarms Easy use loud good instructions not to big so don't look out of place
Date published: 2015-12-07
  • y_2017, m_9, d_20, h_20
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.3
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_11
  • loc_en_GB, sid_4102G, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_screwfix-ie