Prepayment device protection unit

The utility model provides a prepayment device protection unit, which structurally comprises a voltage transformer, a voltage acquisition module, a current transformer, a current acquisition module, a prepayment electricity meter, a memory, a central processing unit (CPU), a switch power supply, a prepayment device vacuum switch and a signal driving circuit. The voltage transformer is connected with the CPU through the voltage acquisition module. The current transformer is connected with the CPU through the current acquisition module. The prepayment electricity meter, the memory, the switch power supply, the prepayment device vacuum switch and the signal driving circuit are respectively connected with the CPU. By utilizing elements of the transformers, breakers and the like of a prepayment device, the prepayment device comprehensive protection unit is designed and has the functions of short-circuit protection, overcurrent protection, zero sequence overcurrent protection, wireless communication and the like, thereby having protection functions. The prepayment device protection unit is capable of achieving the protection functions of customer equipment on the condition of reducing investment of prepayment customers and simultaneously improves power supply reliability.