Notes:
Depending on the setting or R1, when the voltage exceeds a certain amount, SCR1 triggers, which activates relay RY1 and opens the circuit. S1 resets the SCR by interrupting power to it.

This is a simple crow-bar circuit for low amperage protection, up to 4 amps at 30V max.
Adjust the SCR for a model that suits your needs.

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