British General Fortress 8-24V AC 8VA Bell… (8707P)

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British General Fortress 8-24V AC 8VA Bell Transformer Module (8707P)

For use with metal or insulated consumer units and enclosures. Provides constant power to a mains-powered door bell. Can be used in a high integrity circuit. Works with a hard wired door bell, stepping down the voltage from 230V to 8-24V.

  • DIN Rail Mounted Fitting
  • Overload Protection
  • 2 Modules

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View all: British General Doorbell Transformers

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Rated 3 out of 5 by from Mmmmmmmm Looks good, works fine but has a continuous main hum. Had to remove it and install an external transformer as the noise was driving me crazy.
Date published: 2021-08-03
Rated 5 out of 5 by from Google Nest Eufy Ring etc This will work with all new WiFi bells that need 8/16/24v. Make sure you buy the Wyler single din enclosure, some speaker cable and 3-4mm cable tacos to complete your install. Perfect
Date published: 2021-07-14
Rated 5 out of 5 by from Transformer Well made and easy to install you just need an enclosure for it
Date published: 2021-07-09
Rated 5 out of 5 by from Solution for Nest Google Hello My existing 8V Byron 7770 bell transformer was not enough to power my Nest Hello and the chime (Byron 771). The Chime would sometimes give a small ping or nothing. I replaced the transformer with this one and set it to 12V (multimeter showed closer to 15V, well within Hello tolerance). That is enough for Google Nest UK, but you can also set it to 16V if you cross between the 8V and 24V terminals. This transformer will not screw directly to a surface and it has exposed terminals, so you will also need a DIN enclosure. The Wylex IP40 2-module ESE enclosure is ideal. After installing, both the chime and Hello worked well. The chime now sounds strong with its double strike. Initially, I had one issue with the chime having a constant buzzing as if it was receiving a continuous low voltage. I resolved this by reversing the terminals that the Google Hello chime connector attached to (instructions don't specify). Note that my Byron 771 Chime also takes an optional 9V battery. I removed this battery to avoid issues but the terminals to which the battery passed must be bypassed for the chime to work (regardless of the Nest installation).
Date published: 2021-06-21
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Overload protection or not?

The item description says it has got overload protection but the spec. says it hasn't so which one is it? Therefore, can I connect this directly to the busbar or should it be fed from an MCB, like a light circuit?
Asked by: Madeitup
Hi Madeitup, As a normal installation would have the transformer being powered via an existing circuit there was no intrinsic requirement to have any internal protection. Added to this, the output is a maximum of 8VA (8W) so the chances of it over-driving any connected item(s) is negligible.
Answered by: Nexus Technical Team
Date published: 2021-06-22

Buzzing noise

There is quite a loud buzzing noise coming from the transformer when used with my nest hello doorbell (12v). I've heard they are quite delicate. Is it worth replacing to see if a different one fixes the noise problem?
Asked by: Joel7
I’ve tried a few, they all buzz loudly. I’d love a solution to this if anyone has one.
Answered by: NathN
Date published: 2021-06-30

What type of DIN Rail does it require? C section or Top Hat ?

Asked by: Zenas
Hi Zenas, This product would be suitable for Top Hat DIN Rail Mounting. Kind Regards, BG Technical Support
Answered by: Nexus Technical Team
Date published: 2021-05-10

Ring video Door Bell Resistor or not?

Hi as anyone fitted a 25ohm 50w resistor with this transformer to a Ring Video Door Bell Ist Generation as recommended by Ring ?
Asked by: jimf1
Hi jimf1, As Ring have the best technical familiarity with their products we would have to suggest that you follow any installation guidance which they give (i.e. install a resistor as indicated)
Answered by: BG Technical Team
Date published: 2021-06-10

Can I power this (in parallel) off a ceiling light rose?

I don't have any sockets that are close by I can spur off so was wondering if it was possible as I don't want run lengthy cables to get power. The ceiling light inside the porch is the closest power source. I want to power a eufy video doorbell.
Asked by: JamesClifford
Hi JamesClifford, This is a Consumer Unit device, so should be mounted inside the consumer unit with feed wiring from it out to the doorbell.
Answered by: Nexus Technical Team
Date published: 2021-04-18
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Brand British General
CSU Device Bell Transformers
Incomer Fitting Type DIN Rail Mounted
Manufacturer Guarantee 1 Year Guarantee
Model Name Fortress
Model No CUB1-01
Output Voltage 8-24 V AC
Pack Size 1
Pieces in Pack/Case 1
Product Type Bell Transformer Module
Rated Operational Voltage (Ue) 240 V AC
Suitable Cable Size 16 mm²