Direct-current 24V power supply control circuit protection device

The invention belongs to the technical field of fault detection devices, and relates to a DC 24V power supply control circuit protection device. The DC 24V power supply control circuit protection device comprises a line a and a line b. The circuit a is composed of a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1, a bridge rectifier DB1, an integrated voltage stabilizing chip VW1 and a light emitting diode D1. The circuit b is composed of a single-chip microcomputer chip AT89C2051, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C4, a capacitor C5, a capacitor C6, a light emitting diode D2, a crystal oscillator X1, a button SB and a power supply. The protection device for the 24V DC power supply control circuit can quickly determine the fault of the 24V DC power supply control circuit which is touched by the 220V AC power supply by mistake, quickly cut off the AC power supply path, prevent electronic components in a low-voltage DC control loop from being dama