Bg transformer doorbell

[dba7108]

Bought today to power eufy doorbell. No Instructions came with it and I don't know which is positive or negative on the 240v. No markings. Does it not matter? Thanks in advance.

[dba7108]

[Yrag male]

No. Ac is ac. The transformer does not care what way its connected on the 240 side

[hidetheelephants]

It doesn't matter, it's supplying AC power. Presumably that's what the Eufy requires?

[dba7108]

And the low voltage is 24 and 0? The power input according to eufy is 16 -24v. Bit confused as the doorbell charges on usb fine but one connected to 0 and 24 won't charge.

[Yrag male]

I had the same problem with my nest doorbell. I had the exact transormer as you. I went to a A9A15214. Which works a treat. Its 3 modules wide though.

[hidetheelephants]

dba7108 said:

And the low voltage is 24 and 0? The power input according to eufy is 16 -24v. Bit confused as the doorbell charges on usb fine but one connected to 0 and 24 won't charge.

What does the Eufy device require? Is there a data label or a specification in the instructions?

[Yabu]

dba7108 said:

And the low voltage is 24 and 0? The power input according to eufy is 16 -24v. Bit confused as the doorbell charges on usb fine but one connected to 0 and 24 won't charge.

Have you got a separate chime fitted? Quick google suggests you need to fit a resistor if you haven’t got one

[dba7108]

The old ring doorbell din one worked a treat. I think il just buy thr same. Il find the wiring diagram and post.

[dba7108]

The only wiring i can find seems to have a chime in between.

[dba7108]

No chime is fitted. Thanks

[Yabu]

dba7108 said:

And the low voltage is 24 and 0? The power input according to eufy is 16 -24v. Bit confused as the doorbell charges on usb fine but one connected to 0 and 24 won't charge.

0-8 = 8v
0-24= 24 v
The 0 is there as there are tap offs for different voltages, one end of the transformer winding is 0, as the coil increases the voltage goes up

[rodericb]

Hmmm those transformers - there's more than meets the eye.

[No ideas for a name]

I think the transformer you have selected is 8VA
As far as I can tell the Eufy requirement is 16V @ 800mA or 24V @ 500mA which approximates to 13VA.

So, the transformer isn't powerful enough.

(Just for reference, you could pick the 8V and 24V taps and get 16Vac)

Just as a friendly warning, if you have to ask the question about polarity, I am not sure it is wise to be using a DIN rail mounted transformer.
It obviously needs to go in a DIN enclosure, and I assume the plan is to put it in the consumer unit along with a MCB?

[Mr Pointy]

No ideas for a name said:

Just as a friendly warning, if you have to ask the question about polarity, I am not sure it is wise to be using a DIN rail mounted transformer.
It obviously needs to go in a DIN enclosure, and I assume the plan is to put it in the consumer unit along with a MCB?

Not necessarily:

https://www.ebay.co.uk/itm/196410399458

[No ideas for a name]

Mr Pointy said:

Not necessarily:

https://www.ebay.co.uk/itm/196410399458

Well, obviously you can buy a DIN enclosure, but you may as well just buy a plug top PSU for the Eufy which doesn't need one. Nor would there be any possible issues in wiring it up.