Does this bell transformer have overload protection?

[Selfmade]

Hi Folks

I bought one of these Door Bell Transformer | Stevenson Plumbing & Electrical Supplies - https://www.stevensonplumbing.co.uk/door-bell-transformer.html?gclid=EAIaIQobChMIwLOp8p7A3QIV7grTCh3TzQvbEAkYAiABEgIxmvD_BwE as it's SELV and supports illuminated pushes, but can't find any reference to built-in overload protection. Yet the instructions and wiring diagrams do not indicate separate overload protection is needed. I've emailed Greenbrook a few days ago but got no response. I wonder if anyone know either wither it has overload protection, or how I can find out? (I've had the cover off and there are no obvious fuses like in some old transformers).

 

[buzzlightyear]

Why do you think it needs ol protection is it just in case some one pushs the door bell to long .

 

[buzzlightyear]

you are not going to wire that up to a chair are you !

 

[buzzlightyear]

I've emailed Greenbrook a few days ago but got no response

I bet they are p88ing them self's laughing .I'm on the floor my self .

 

[westward10]

What are you going to use it for, a door bell or something else.

 

[Selfmade]

Thanks for all your replies folks, you've got me wondering now. Thought I remembered reading (perhaps on here) that bell transformers have to have it, plus the old one I've removed has a couple of cartridge fuses visible when the cover is removed. But now I come to think of it as it's a single load maybe it's not necessary. Although I can't help thinking short circuit protection would be in order. Thinking and reading cap back on I guess...

 

[Selfmade]

What are you going to use it for, a door bell or something else.

Doorbell.

 

[westward10]

Doorbell.

Then it will not require circuit protection.

 

[Selfmade]

Then it will not require circuit protection.

OK thanks, I'm just trying to imagine what would happen in the event of a short circuit. Could this not lead to overloading of the bellwire and/or transformer in the absence of any protection? And why do at least some of the old transformers have fuses?

 

[Marvo]

I'd probably fit a small in-line fuse holder and a 1 Amp slow-blow fuse on the secondary side if I was installing it in my house.

 

[westward10]

It would probably melt the secondary wires if it shorted much like a fuse.

 

[Marvo]

Those little tiny transformers are often so innefficient as to limit the secondary fault current to safe levels but I can't see a symbol on it to indicate it's impedence protected.

 

[dmxtothemax]

Many power transformers have a thermal fuse embedded in the winding's of the transformer.They usually have a symbol on them somewhere to indicate such. But with cheap Chinese, anything is possible. so instal a fuse if you are concerned, it's good practice anyway.

 

[Wilko]

Hi - the instructions don't mention any additional fusing being required. That said, I would not direct wire this into a power circuit.

 

[westward10]

I think he means the seconhairy side.