The BRK 770MRL (also known as ) mains powered ionisation smoke alarm provides quick detection of fast flaming fires and is typically installed in upstairs landing areas. Fitted with a sealed re-chargeable lithium back-up battery, the 770MRL does not require a battery change for the life of the alarm, making it ideal for properties where replacing batteries would be inconvenient. Up to 12 alarms from the BRK 700MRL series can be interlinked by wire within a single system.
- 230V mains powered smoke alarm
- Sealed lithium back-up battery - does not need replacing for the life of the alarm
- CE marked and Kitemarked to BS EN 14604
- 5 year manufacturer's warranty
- Suitable for installations complying to BS 5839-6: 2013 Grade D, E and F
- Quick to respond to fast flaming fires
- Suitable for installing in upstairs landing areas
- Up to 12 alarms from the 700MRL series can be hard wire interlinked
- An interlinked system provides the earliest possible warning of fire
- Test and hush button facility
- Easy to install push-fit base plate
Please note: this product is not a direct upgrade from the 670MBX smoke alarm. Upgrading from a BRK 600MBX series alarm featuring an alkaline battery and twist-on base .
The table below shows all the units that can interlink with the BRK mains powered smoke and heat alarms.
Alarms from the Same Series
||Type of unit
||Type of interlink
||Ionisation Smoke Alarm
||Hard wire interlink
||Optical Smoke Alarm
||Hard wire interlink
||Hard wire interlink
This is the technical data for the Mains Powered Ionisation Smoke Alarm with Lithium Back-up Battery - BRK 770MRL.
|Alternative Product Codes
||BK770, 770, 770MRL, BK770MRL
||85dB at 3m
||Sealed long life lithium
||+5 °C to +38 °C
||10% to 85%
The following datasheets are available for this product.
Q. Can air purifiers affect ionisation smoke alarms?
A. Yes, air purifiers may cause ionisation smoke alarms to sound falsely.
Q. What smoke alarm should I use in a bedroom with an en suite bathroom?
A. It is usually recommended to install an optical smoke alarm in a bedroom. This is because optical smoke alarms are slightly quicker at detecting slow smouldering fires that can originate from upholstery type materials and over-heated wiring. Also, an optical smoke alarm would be less likely to sound a false alarm than an ionisation would, if steam/water droplets were present from the bathroom. Detectors should be installed as central to the room as possible; however for your application I would also consider the position of the en suite to make sure that the detector is not in the direct path of the joining door. This is just to try and avoid the chances of a false alarm. No detector is designed for use in bathroom areas.
Q. How do I safely dispose of my old smoke alarms?
A. Safelincs is signed up to Valpak's WEEE (Waste Electrical and Electronic Equipment) Distributor Take-Back Scheme (Registration ID: 7370). Private households can therefore drop off their electronic and electrical fire safety waste at their municipal recycling centre when they are purchasing new products from us. To find your nearest recycling centre, please visit www.recycle-more.co.uk.
Q. Can the mains powered smoke alarm range be connected to mains power via the lighting circuit?
A. Yes, hard-wired mains powered alarms can be wired to the unswitched live feed of the nearest frequently used lighting circuit.
Q. How long do the batteries last in smoke alarms?
A. The 9V alkaline batteries last 12~18 months. Lithium batteries will usually last 5x longer than their alkaline counterparts, achieving around 5 years lifetime. Some lithium cells are also rechargeable, and when used in a mains-powered alarm may last for the entire functional lifespan of the alarm. Newer alarm models may also feature a "sealed" lithium battery. These batteries are specialist components which are designed to not be removed or need replacing by the user, and have been tested by the alarm manufacturer to ensure they last for the lifetime of the alarm.
Please Note: the actual lifetime of your batteries depends on how often the alarms are tested or activated, as sounding the alarm draws more power than when the alarms are "waiting" to detect fire. You should also read your alarm's manual to make sure you only use the recommended types and brands of batteries, as failing to follow these instructions may cause the alarm to malfunction, not alerting you in the event of a fire, and might also invalidate the warranty.
Q. If a false alarm goes off can pressing the hush button on any of the interlinking alarms stop all the units beeping?
A. No, to stop the alarms from sounding the hush button on the unit that started the process needs to be pushed. Pressing any other unit will just silence that one unit. The unit can be identified by the rapidly flashing red LED.
Q. When the test button is pressed on an interlinking smoke alarm will this cause all the other units to go off, too?
A. Yes, by pressing the test button on one alarm all the units in that family will also be activated. To 'teach' the units which other smoke alarms belong to the same family, the smoke alarms have to be set up together during the installation. This is done by pressing a 'housecoding button' or similar process.
Q. What sort of smoke alarm system would I need to install for a HMO?
A. BS 5839-6 recommends that one or two storey HMOs with an individual floor area of no more than 200sqm (not the total of both floors) should have a Grade D smoke alarm system installed. Grade D refers to mains powered smoke alarms with a back up battery power supply. The alarms can be interlinked either by wire or by radio signal and the system does not require a separate fire alarm panel. For HMOs of 3 storey or higher, a Grade A panel system would need to be installed. This can cover the whole of the building, or can be used just for the communal areas with a separate Grade D system installed for the individual dwellings. For both applications, the level of cover should be a minimum of LD3 (in all escape routes) but this may change according to the fire risk assessment.
Q. The smoke alarm is mains powered do you need an electrician to connect them?
A. It is necessary that an electrician installs mains powered smoke alarms.
Q. How long do smoke alarms last before needing replacement?
A. It is recommended that smoke alarms are replaced after 10 years. This is because the sensors in the smoke alarms become less sensitive and may not activate when a fire is present.
Q. Can I put my smoke alarm on the wall, or must it be mounted on the ceiling?
A. The best location to install your smoke alarm is in the centre of the ceiling rather than on the wall. During a fire, smoke initially rises and then spreads to the sides of the room. By installing the alarm on the ceiling, this ensures that you receive the earliest possible warning of a fire.
Q. Why do your mains powered alarms have batteries?
A. All our mains powered alarms have a battery backup. Although mains powered alarms without this option do exist (BS5839 part 6 grade E), we regard them as far too dangerous, as a lot of fires are caused by electrical faults leaving the building unprotected against fire if the smoke alarms have no backup battery. With our mains powered alarms you will always be protected.
Q. Do I need an ionisation or optical smoke alarm?
A. We recommend using an optical smoke alarm in hallways, as these are less likely to go off because of cooking fumes from a connected kitchen. Optical smoke alarms are also ideal for living rooms, dining rooms, bedrooms, as they are good at detecting smouldering fires from soft furnishings. For landings we recommend ionisation alarms. Heat alarms are designed for kitchens and garages. No alarms should be installed in bathrooms.
4 customers have rated this product and it has an overall rating of 5 out of 5
All our reviews are written by real customers that have purchased this product from us and are published without modification.
Reviewed by: KS
Great product and simple to install onto an existing plate if you are replacing an old product such as DICON
Watch out for the battery tag, there is a clear one which implies you pull it out and it is then connected. In actual fact you need to take the battery out and connect it. Not sure what the first tag is for.
Published on: 18th March 2019
Reviewed by: MC
Exellant replacement for my old smoke alarms which were the type that needed the battery replacing every few years.
Published on: 5th November 2018
Reviewed by: AT
Does what it says on the box!
Published on: 14th October 2018
Reviewed by: MJ
Fits in place of an older model. does the job I need it to do.
Published on: 27th April 2016