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Mains Powered Heat Alarm with Alkaline Back-up Battery - BRK 790MBX
Discontinued Product
The manufacturer has withdrawn from the European market and is no longer supplying compatible alternatives. Since it is not possible to interlink alarms from different manufacturers, the recommended replacement for the whole discontinued 700MBX range is the Kidde Firex series.
alternative product
Kidde Firex Mains Powered Alarms with Alkaline Battery
- 230V mains powered with alkaline back-up battery
- Available in Ionisation, 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 the 2022 Scottish legislation
£17.75 inc VAT
£14.79 ex VAT
Product Overview
Interlink
Technical Data
FAQs (4)
Fitted with a replaceable alkaline back-up battery, the BRK 790MBX (also known as 690MBX) is a mains powered heat alarm ideal for areas where a standard smoke alarm would be unsuitable, such as kitchens and garages. Supplied with an easy to install push-fit base, the alarm is designed to detect rapid increases in room temperature and up to 12 smoke and heat alarms can be interlinked via a hardwired connection to ensure an early warning if a fire is detected.
- 230V mains powered heat alarm
- 9V alkaline back-up battery (included)
- 5 year manufacturers 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
- Monitors rate of increase in room temperature
- Suitable for installations needing to comply with BS 5839-6: 2019 Grade D2
- Ideal for kitchens and garages
- Test button facility
- CE marked and Kitemarked to BS 5446-2: 2003
- Dimensions (HxD): 68x140mm
- Product warranty and life commences from date of purchase
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 |
| Product Code | BK790MBX |
|---|---|
| Brand | BRK |
| Back-Up Battery | 9V alkaline |
| Dimensions (HxDia) | 68x140mm |
| Operating Temperature | +5 °C to +38 °C |
| Relative Humidity | 10% to 85% Relative Humidity |
| Sound Output | 85dB |
| Weight | 0.33kg |
| Product Datasheets |
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. How long do the batteries last in smoke alarms?
A.
The 9V alkaline batteries and AA alkaline batteries generally last 12 to 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. 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.
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