ASCO Two-Source Automatic Transfer System

The ASCO Two-Source Systems are designed for automatic switching of loads between the utility source and an alternate source of power. Upon the loss of the utility power source, the system provides an automatic start signal to the alternate source of power. Once the alternate source has reached proper voltage and frequency, the system transfers the critical load from the utility source to the alternate power source. When normal power is restored the controls will retransfer the load to the utility and signal shutdown of the alternate power source after allowing a cooldown period.

The ASCO Two-Source Systems include an automatic transfer switch, any any or all of the following options; automatic engine starting controls, overcurrent protection for both emergency and normal sources, instrument meters, status annunciation, and audible alarm. The systems are designed to NEMA switchboard construction and are labeled to UL 891 standards.