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Mains Powered Ionisation Smoke Alarm with Alkaline Back-up Battery - BRK 770MBX

1 Customer Reviews
£19.96 inc VAT
£16.63 ex VAT
Product Overview

Fitted with a replaceable alkaline back-up battery, the BRK 770MBX (also known as 670MBX) is a mains powered ionisation smoke alarm supplied with an easy to install push-fit base plate. Most suitable for detecting fast flaming fires, this alarm comes with a 5 year manufacturer's guarantee and can interlink with up to 12 other compatible devices (by wire). The BRK 770MBX is CE and Kitemarked to BS EN 14604 and has a test and alarm silence feature.

  • 230V mains powered ionisation smoke alarm
  • 9V alkaline back-up battery (included)
  • 5 year manufacturer's warranty
  • Please note that BRK and First Alert are no longer manufacturing new stock for the European Market and while the products may have a 2018/19 manufacturing date they still provide a full 10 year lifespan and full warranty cover from date of purchase
  • Hardwire interlink with up to 12 compatible devices
  • Test and alarm silence button
  • CE and Kitemarked to BS EN 14604: 2005
  • Suitable for detecting fast flaming fires
  • Suitable for installations needing to comply with BS 5839-6: 2019 Grade D2
  • Supplied with easy to install push-fit base plate
  • Dimensions (HxD): 53x140mm
  • Product warranty and life commences from date of purchase
Interlink

The table below shows all the units that can interlink with the BRK mains powered smoke and heat alarms.

600 Series

Model Number Type of unit Type of interlink
660MBX Ionisation Smoke Alarm Hard wire interlink
670MBX Optical Smoke Alarm Hard wire interlink
690MBX Heat Alarm Hard wire interlink

700 Series

Model Number Type of unit Type of interlink
760MBX Ionisation Smoke Alarm Hard wire interlink
770MBX Optical Smoke Alarm Hard wire interlink
790MBX Heat Alarm Hard wire interlink
760MRL Ionisation Smoke Alarm Hard wire interlink
770MRL Optical Smoke Alarm Hard wire interlink
790MRL Heat Alarm Hard wire interlink
Technical Data
Product Code BK770MBX
Brand BRK
Back-Up Battery

9V alkaline

Dimensions (HxDia)

53x140mm

Operating Temperature

+5 °C to +38 °C

Relative Humidity

10% to 85% Relative Humidity

Sound Output

85dB

Weight 0.32kg
Product Datasheets
FAQs (12)
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. 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. What is the best way to test my alarm?
A.

We recommend testing alarms by pressing the test button built-in to the unit, as this is designed to simulate the detection of the target stimuli (usually smoke, heat, or CO) at the alarm sensor. You should test your alarms regularly to ensure they are protecting building occupants, preferably every week. For more detailed guidance, check the manual included with your alarm.

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. Do you need an electrician to connect mains powered smoke alarms?
A.

It is necessary that an electrician installs mains powered smoke alarms.

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. 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. Can a smoke alarm be fitted with a sticky adhesive pad in a let property?
A.

The sticky pad is suitable for all battery operated smoke alarms. However, we cannot judge if battery alarms are suitable for your let property, as let properties usually require mains powered alarms. There is some advice to this in the governments guides to fire risk assessments. http://www.safelincs.co.uk/Fire-Risk-Assessment/
Also see the LACoRS guide for let properties.

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. 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. Can air purifiers affect ionisation smoke alarms?
A.

Yes, air purifiers may cause ionisation smoke alarms to sound falsely.

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.

Pricing & Availability

Model Stock Price
Product Code: BK770MBX Stock Level:
More than 20 in stock Expected dispatch: Today
Price:

£19.96 inc VAT

£16.63 ex VAT

Delivery Options

The following delivery options are available on this product.

Economy Delivery

£4.79 inc VAT - Orders will be delivered in 3-5 working days by Hermes

Express Delivery

£7.91 inc VAT - Orders will be delivered in 1-2 working days by Hermes

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 4 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: 4 / 5 Stars

Reviewed by: S V

Prompt service

Published on: 19th April 2021

Looking for more information?

If you have any questions or would like more information about this product you can ask one of our specialists.

Direct Telephone 01507 464181