Abstract: In recent years, the damage frequency of prepaid meters is increasing slowly, because of the unstable operating environment and the private debugging by customers, so the lifespan of the prepaid meters is greatly shortened and the equipment resources are wasted. Based on this, an anti-burn device is designed that can disconnect the power supply of the tripping coil through the thyristor of the zero-output control module after the delay time is reached. The coil can be energized for a short period of time to reduce the power-on time. Therefore, the burning of the negative control relay and the tripping switch coil is solved, caused by frequent closing of meter when the negative control is in the energized state.