PTS-400 CONTROLLERThePTS-400 is an Automatic Transfer System Control Module. It precisely measureand display two source single phase AC voltage and output free voltagecontrolling switch signal. This module is compatible for a variety of ATSsystem and can be widely use for electrical devices in many fields such aselectric power distribution systems, telecommunication, petroleum, coal,metallurgy and electric transport industry. Commercial and residential usewhere main and backup power source is required.