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The ATC-900 Controller is a programmable microprocessor-based monitoring device for use on Cat transfer switches. Data access and programming operations are performed using the ATC-900’s touch sensitive function buttons in conjunction with an easy-to-read illuminated alphanumeric LED display. Both the functional buttons and the display window are part of the device’s door mounted front panel. A built in Help button provides user assistance in the form of message displays.

The communication option permits monitoring and control of several transfer switches, locally or remotely from a single point. Depending on the application, the user can customize the ATC-900 to meet the particular application. The ATC-900 is equipped to display historical information either via the front panel or over mod bus communications to a personal computer. Source 1 and Source 2 run time, available time and connect time are available, as well as load energized time, number of transfers, date, time and reason for the last 16 transfers.




  • Technical Summary
    Spec Value
    Rating Range 120 to 600V, single phase and three phase @ 50/60 Hz
    Transfer Type Switch application dependent
    Switch Type Switch application dependent
  • ATC Controller Specifications
    Spec Value
    Input Control Voltage 120Vac (50/60 Hz) (operating range 65 to 160 Vac)
    Voltage Measurements of Utility Source 1, Source 2 and Load
    (VAB, VBC, VCA for Three Phase System)
    Voltage Measurement Range 0 to 700 Vac
    Voltage Measurement Accuracy +/-1% of full scale
    Frequency Measurements Of Source 1 and Source 2
    Frequency Measurement Range 40 Hz to 80 Hz
    Frequency Measurement Accuracy +/- 0.1 Hz
    Undervoltage Dropout Breaker Style 50 to 97% of Nominal System Voltage
    Contactor Style - 78 to 97%
    Undervoltage Pickup (Dropout +2%) to 99% of Nominal System Voltage
    Underfrequency Dropout Range 90 to 97% of Nominal System Frequency
    Underfrequency Pickup Range (Dropout +1 Hz) to 99% of Nominal System Frequency
    Overfrequency Dropout Range 103 to 110% of Nominal System Frequency
    Overfrequency Pickup Range 101% to (Dropout +1 Hz) of nominal system frequency
    Operating Temperature Range -20 to 70 degree C (-4 to +158 degree F)
    Operating Humidity Up to 90% Relative Humidity (non-condensing)
    Enclosure Compatibility
  • NEMA 12 (std mounting)
  • NEMA 3R
  • UV Resistant Faceplate
  • Ratings
    Spec Value
    System Voltage Application 120 to 600 Vac (50/60 Hz) (single or three phase)