Pcb Voltage

How to prevent circuitry with DC5&24V switch from damage when SW is 5V,but 24V being inputed?
There is a dc circuitry with a switch of 5V&24V. User can choose either to operate the circuitry. But some ppl accidently input 24V when switch is at 5V position. High current flow into series of resistor & LED circuitry. This results in pcb burnout and resistor burnout.
How to prevent this even when user input wrong voltage into?
Thank you
Your easiest method would be to install a fuse that can be accessed from the outside of the enclosure so when the wrong voltage is applied the fuse will pop instead of the circuitry. There are some push-button resettable type circuit breakers available for you to use as well.
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