Every electrical switch when you try to turn them on or off whether it’s a light bulb, fan, thermostat, toaster make a clicky sound. Why is that? Whether it’s a rocker switch or a toggle switch. Are there switches which make no sounds at all? If so, then why aren’t they as popular?
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The best way to make or break an electrical contact is with a mechanical switch that physically breaks the connection. They’re clicky for reasons other explained.
If you don’t need the physical disconnection you can use a transistor or a Solid State Relay. Those are less safe in some ways but have advantages like working much faster, not wearing out and not clicking.
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