Sockets and switches are found in almost every room, whether it's an office, a residential house, or a utility building. These devices are now very practical and durable, but there are situations when they start to crackle. This can be alarming and should immediately raise concern for any responsible user. So, a switch is crackling — is it dangerous?

Main Problems with Switches

Let's first look at what problems may occur with these devices:

  • The device doesn't work, and the indicator light has stopped glowing;
  • The switch works, but the light fixture doesn't turn on;
  • The lamp flickers and buzzes when switched on;
  • The switch crackles when pressing the buttons or keys;
  • The bulb burns out immediately after turning on the switch;
  • The device heats up during prolonged use, and the button does not respond on the first try.

If you’ve encountered any of these problems or heard crackling inside the switch, it's critical to identify the cause immediately — your safety depends on it.

Why Is the Switch Buzzing?

Buzzing often sounds like humming and may be accompanied by crackling. The reason for these noises can be one of the following:

  1. Contact oxidation may occur. This happens when there is high humidity in the room, and the switch lacks proper protection. As oxidized components come into contact, they can create an electric arc that sounds like buzzing. This is dangerous and can lead to a short circuit or even a fire.
  2. Another reason a switch crackles is due to a weakened internal plate. When pressing mechanical switches, a plate presses the contacts together. Over time, it stretches and loses strength, resulting in a softer button press that requires more effort to activate the light.
  3. If you bought a budget model, it might be of poor quality and operate with soft-start features. When such a fixture is used with a low-powered breaker, the device will inevitably buzz.

Another possible cause of buzzing or even sparking in mechanical or touch switches is a mismatch between the lamp’s power and the switch's load rating.