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This system is carried out using 2 (two) power between the power of the PLN as the main power and the generator as a backup power. This system uses a power capacity for PLN of 30KVA and Genset power of 45KVA. This observation was carried out in the Clinical Laboratory of Prodia Sunter Barat. This system relies heavily on the important role of the Motorized Change Over Switch device, because with this device, the automatic transfer system can run properly without collisions when the backup power supply is being used and when the main power supplies returns. The results of observations on two power experiments between the power of the PLN and the power of the generator when there is a blackout at the PLN. Automatically the performance of Motorized Change Over Switch works has a range of pauses of 18 seconds to be able to power the Genset capable of taking on the role of PLN to back up the Prodia Sunter Laboratory Building, and when the PLN power returns the power is held for 30 seconds by a Motorized Change The Over Switch ensures that the main power of the PLN is reconnected.