A control apparatus, which controls a refrigerating apparatus including a compressor and a first circuit breaker that interrupts a current flowing through the compressor when the current, flowing from a power supply through the compressor to cause the compressor to work, becomes greater than a predetermined current and that is closed according to an operation by a user, includes: a voltage-measuring unit to measure a power-supply voltage a control unit to trip a second circuit breaker disposed in series with the first circuit breaker so that the current from the power supply flowing through the compressor is interrupted, when the measured power-supply voltage becomes lower than a predetermined voltage, and close the second circuit breaker after the power-supply voltage becomes higher than the predetermined voltage, the predetermined current corresponding to a current greater than the current flowing through the compressor when the power-supply voltage is equal to the predetermined voltage.