This circuit monitor VIN and protect the output voltage by a series connected transistor Q14. During over voltage condition Q14 B is turn on which cause Q14A to disconnect output to VIN. Desired overvoltage limit is set by D10 plus VBE of Q14. For example, if the required cutout voltage is 12V, Zener voltage of D10 has to be 12-0.6= 11.4 V.
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