Based on the image you shared showing a burned-out or broken PCB track, this damage is likely due to a high voltage surge, such as one caused by a lightning strike.

To prevent this from recurring, replace the damaged wall switch with a new one from a reliable brand of your choice. Additionally, add a MOV/Varistor (10K431K) between the incoming Live and Neutral wires. This applies if you're using a smart switch with a neutral wire setup. If you're using a bypass capacitor, however, the MOV may not function as effectively.



The MOV (Metal Oxide Varistor) will help protect your sensitive electronic devices by absorbing excessive voltage before it reaches them.

Be sure to select a 10D431K specifically, as other values may not provide the same level of protection.

NOTE: Those staying in condo or high-rise building may not require such a protection as the building management already installed some kind of protection to prevent the voltage surge to its tenants.

anyone covert their analog doorbell to smart?
mine one recently the outdoor button broken.
thinking to upgrade it.

preferred to use the existing 220v wiring and no to battery.

any ideas are welcome, including diy esp.

I have super newbie questions 🙇‍♂️ would like to ask:

1) Are smart switches able to wire for 2 way, specifically smart switch for water heater? One of the smart switch vendors I spoke to suggested that I use app scene/automation function to mimic 2 way switch function instead, I'm not sure if this is recommended...

2) From my understanding, most smart switches are not compatible with DC fans. Would like to ask anyone's experience, do IR/RF blasters work well with remote controlled KDK fans?

Hi. I come across this 20A 40A smart wifi switch which they advertise it for water heater. Wonder if it is suitable to replace the normal 20A aircond switch.. Main putpose is to monitor the power usage.

Anyone can recommend suitable smart switch for aircond? Thanks