0
\$\begingroup\$

I have just bought a door bell from the State however, I am staying in Singapore, where the voltage is 240 in oppose to 110. The vendor told me to simply get a 16-24VAC transformer with 40VA. After installation, the system worked only half a day and it stopped working and there seems to be a burning smell from the transformer. Did the vendor give me the right set of information?

Do I need a step down from 240v to 110v then use another transformer to transform it to the required 40VA?

Please advise as I am stuck and need to install the system asap.

My transformer has the following set of data: Input: AC220V 50 Mhz Output: AC24V 2A

\$\endgroup\$
  • \$\begingroup\$ you have a 24Vac doorbell and a 220/24Vac transformer 50Hz 48VA . Was there any center tap? Got a photo? Sounds ok from description. Did you measure Vout? \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Oct 14 '16 at 4:49
  • \$\begingroup\$ It sounds like you've got a 16 volt doorbell connected to 24 volts. What are the voltage, current and wattage specs for your "doorbell"? \$\endgroup\$ – FiddyOhm Oct 14 '16 at 9:57
  • \$\begingroup\$ Thanks for the advice. I am passing that info to my electrician. I bought a video doorbell and the only information I got was that I require a 16-24 VAC transformer...which I thought my electrician has installed for me. This is the website ring.com/pro \$\endgroup\$ – Jason Oct 17 '16 at 2:42
1
\$\begingroup\$

A 220 VAC transformer can work without any problem on 240 VAC. The difference in voltage is not enough to cause problems. A 110 V AC transformer will burn because the difference in voltage is to high.

I suppose that your transformer from the USA indicates 110 VAC/24VAC 2A or something like that.In that case you need a transformer as mentioned 240 VAC/24VAC 2A.

It might be that your transformer from the USA has to primary windings in parallel. In that case you could ask a technician to put both windings in series and you could use the transformer from the USA without any problem.

It is also possible to use a stepdown transformer as you indicated in your question. 240 VAC/110 VAC but with more than 50 VA because you have to compensate for the transformer losses.

|improve this answer|||||
\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.