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In order to measure the actuation time of low voltage electrical apparatus, this paper designs an intelligent timing device triggered by single and double circuits. The device adopts the system structure of the upper and lower computer so that the action signals will be collected and measured by lower computer through conditioning, and the measurement results will be shown on the digital tube. Through communication with lower computer by RS232 serial port, the upper computer can display the real-time status and results of the measurement and issue commands to control the operation of the device. Utilizing modular programming, and targeted for the action characteristics of different components, this paper puts forward adaptive optimization testing algorithm, which can achieve single / double circuit timing, digital display, upper computer monitoring, manual / programmed control, the positive and negative transition trigger of the adaptive input signal and other functions. After the tests on actual functionality and reliability, the device is successfully applied in aircraft power supply system. The results suggest that the function of the timing device is complete, its structure is simple, easy to maintain, and it can meet the measurement requirements of the actuation time for low voltage electrical components.