The ATC-800 Controller is a programmable microprocessor-based monitoring device for use on Cat transfer switches. Data access and programming operations are performed using the ATC-800’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-800 to meet the particular application. The ATC-800 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.

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Technical Summary

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

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

    System Voltage Application
    120 to 600 Vac (50/60 Hz) (single or three phase)