Apollo Command Module (Block I) AC Over/Under-Voltage Assembly, measuring 17.5 x 4.5 x 7, manufactured by Autonetics. The part label identifies the piece as "Sensor, AC Over/Undervoltage, 45000-501-1…Serial No. 06359-0065BHA, Mfg. Date 3-17-66, Control No. ME431-0062-0003." Several warning labels are also affixed, and the internal wiring is exposed on the bottom. This sensor is comprised of electronics used to sense and alert crew members to anomalous conditions of the alternating current on the electrical buses. The detection of insufficient or excess voltage would trigger an alarm on the Apollo spacecraft's main display console.
