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

£ 8.95INC VAT

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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

£8.95INC VAT

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Rated 5 out of 5 by from Works on Blink Doorbell I recently bought a video doorbell which stated it would work on 8 to 24 volts? However when it came it was 12 to 24 volts! This unit was a great price and fitted my needs well. My only issue was the screws on some of the input and outputs where locked solid and took a little power to get them shifted. It was the ones I wanted to use too!
Date published: 2022-12-04
Rated 1 out of 5 by from Poor quality Cheap and it does the job but I installed in the hallway which is below our bedroom and we could hear this humming during the night. Have since paid a bit more for the Official Ring transformer which works fine. I shouldn’t have gone cheap from the start!
Date published: 2022-11-25
Rated 5 out of 5 by from Works with Nest Hello Doorbell I recently installed a Nest hello doorbell (wired) and can confirm that this Tx has now re-instated my door bell chime. Both 16V and 24V settings worked, so left the set-up at 16V. Door chime is Freidland 'ding dong' about 20 tears old.
Date published: 2022-11-15
Rated 5 out of 5 by from Great product Used to replace previous one. Fitted a few months ago so can comfortably say it is reliable.
Date published: 2022-10-12
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Can I use this to replace my faulty Friedland 752 Transformer?

Asked by: KeefyH
Hi KeefyH, The Friedland 752 Transformer seems to have a selectable 3, 5 or 8V AC output with a fixed 1A current, this transformer on the other hand has a selectable 8, 12 or 24V AC with a fixed 8W output (so 1A at 8V, 0.666A at 12V or 0.333A at 24V). If your specific power requirements are 8V AC at 1A then this transformer will be suitable, but it cannot replicate any of the other output options from the Friedland 752 Transformer.
Answered by: Luceco Technical Team
Date published: 2022-10-14


Will this unit fit inside item 32311? I am confident that it would, I just want to double check.
Asked by: DIYMasterClass
Hi DIYMasterClass, We haven't had any Wylex enclosures in to test with our BG devices, so we cannot be certain of the compatibility, but most manufacturers' devices are very close to being identical dimensions so it is likely to fit.
Answered by: Luceco Technical Team
Date published: 2022-10-18

What is the electricty cost of the transformer?

The no load current of this transformer as 45 mA. which means it uses 11 watts of electricity when on and not drawing a bell current (most of the time) If electricity cost 28p Kw/hr that would mean the annual cost is £27 Is that correct?
Asked by: GreenDave
Hi GreenDave, Based on your kWh charge suggestion (which a quick internet search seems to indicate is a possibly a little high). 45mA at 240V (nominally) is 10.8W, and this drops to 10.35W if you take a more average 230V. Still 10.8W, or 0.0108 x 28p = 0.3024p/h, x24h = 7.2576p/day, x365.25 = 2650.8384p or £26.51 (which drops to £25.40 at 230V). One other thing to bear in mind, the no-load readings for a transformer coil can (sometimes) be skewed an unpredictable amount by interactions between the actual transformer coil and the sensing coils in the meter, which if it happens almost invariably causes a `phantom' rise in the readings.
Answered by: Luceco Technical Team
Date published: 2022-07-17

Can I wire two Ring doorbell wired to this unit?

I want to put a Ring wired door bell at the front and another at the back of my house - can they both be run off of a single transformer?
Asked by: BobBeer
Hi BobBeer As long as the wattage of both door bells does not exceed the 8VA rating when connected to the circuit (8W), then you should be able to add both doorbells on this single Bell Transformer Hope this helps,should you require any further assitance please contact us directly on 01952 238128
Answered by: Luceco Technical Team
Date published: 2022-10-26

Not enough power??

The RING Wired doorbell specifies a power requirement of 40 VA. Maybe 30VA is really enough... but why are folk surprised when this transformer rated for 8VA hums or packs up after a while?
Asked by: foxyrhyl
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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