BRK 670MBX Ionisation Smoke Alarm, Mains Powered with 9 V Battery Backup

Product Information

The BRK 770MBX alarm contains an identical replacement alarm head for your outgoing BRK 670MBX ionisation smoke alarm which uses replaceable alkaline batteries. The only difference is that the spare base supplied is a push-fit version rather than the twist-fit you already have installed. This replacement detector head fits directly onto your existing twist-fit base and is guaranteed to be compatible with your existing system.

Between alarms from different manufacturers, the bases cannot be reused as described above but a suitable replacement system will be able to use the existing mains power wiring and the interlink wiring that sets off all other alarms when one detects fire. An electrician is required for safe replacement of the bases and wired connectors, but at least there will be no need to lay new wiring around your whole property. They are mains alarms, model 670MBX, fitted by the house builder 5 years ago. There has been no problems until now.

Delivery Options

CAUTION! If your alarms are interlinked, or interconnected, via a wire (i.e. not using the DS700RF wireless base) such that testing one alarm causes all alarms to sound, then care must be taken to ensure all mains power circuits which supply the alarms are turned off at the fuse. While it is recommended to install mains powered alarms onto a single, dedicated power circuit this is often not possible where the alarms are fitted in an existing property which did not previously have mains powered alarms. In these cases it is likely that each alarm is powered from a nearby power circuit that already existed, connected to different fuses, and the interlink wire can carry a live electric current to the other alarms around the building. These alarms were very popular for many reasons but prime among these was the ability to replace older alarm heads with units from newer ranges without the need to replace the base. The new alarm would fit directly onto the existing base, removing the need for an electrician and allowing the user to perform the replacement with only a few simple steps. With the exit of BRK from the European market, almost the only alternative remaining to customers needing to replace any BRK alarms was to replace their entire system with another from different manufacturer – except for the easichange® direct replacement range.

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.originally I thought I could be due to the intense heat as this has gone off before - but even when the house is super cool, the beeping just happens.