Apparatus for interfacing air circuit breaker

An apparatus for interfacing an air circuit breaker is provided to control the driving of a trap coil by using a first central processing unit and to control a communication performance by using a second central processing unit. An apparatus for interfacing an air circuit breaker includes a voltage detecting unit(200), a detection voltage processing unit(210), a first central processing unit(220), and a trip coil(230). The voltage detecting unit includes a current transformer and a Logowski coil. The current transformer detects current supplied from the air circuit breaker. The Logowski coil transforms the current detected by the current transformer to a voltage. The detection voltage processing unit includes a rectifier and an analog/digital converter. The detection voltage processing unit rectifies the detection voltage outputted from the voltage detecting unit in the rectifier and converts the rectified voltage into a ripple voltage. The detection voltage processing unit converts the ripple voltage into a digital signal in the analog/digital converter to output the digital signal to the first central processing unit.