How to protect when AC240V is accidentally wired to DC o/p?

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Hi all, I am thinking is there a way to protect the power supply when,
AC240V is accidentally wired to the 24V DC output?

The power supply has to function normally when the fault is removed.
Pls share with me any ideas you have. Thank you!
 

The only simple you can do is to use a relay to cut off and isolate the circuit when ever any voltage above 24 is applied to the same.
 

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