The ATC-100 is a comprehensive and multifunctional microprocessor-based ATS controller. It is a compact and self-contained panel-mounted device that is designed to replace traditional relay and solid-state logic panels.The ATC provides both fixed and jumper-selectable settings to allow for a range of applications. It operates from all system voltages between 120 and 480 Vac, single-phase and three phase at 50 or 60 Hz. The ATC-100 monitors the condition of the three-phase line to line voltage and the frequency of both the utility and generator power sources. It can also be set up for single-phase operation. The ATC-100 provides the necessary intelligence to ensure that the transfer switch operates properly through a series of selectable sensing and timing functions.

Technical Summary
Rating Range 120 to 480V, single phase and three phase @ 50/60 Hz
Transfer Type Switch application dependent
Switch Type Switch application dependent

ATC Controller Specifications
Input Control Voltage 95 to 145 Vac 50/60 Hz
Voltage Measurements of Utility VAB generator VAB
VBC generator VBC
VCA generator VCA
Voltage Measurement Range 0 to 575 Vac rms (50/60 Hz)
Voltage Measurement Accuracy ± 1% of full scale
Frequency Measurements Of Generator
Frequency Measurement Range 40 Hz to 70 Hz
Frequency Measurement Accuracy ±0.3 Hz over the measurement range
Undervoltage Dropout 80% of the nominal system voltage
Undervoltage Pickup 90% of the nominal system voltage
Underfrequency Dropout Range 90% of the nominal system frequency
Underfrequency Pickup Range 95% of the nominal system frequency
Overfrequency Dropout Range 115% of the nominal system frequency
Overfrequency Pickup Range 110% of the nominal system frequency
Operating Temperature Range –20 to +70°C (–4 to +158°F)
Storage Temperature Range –30 to +85°C (–22 to +185°F)
Operating Humidity 0 to 95% relative humidity (noncondensing)
Operating Environment Resistant to ammonia, methane, nitrogen, hydrogen and hydrocarbons
Generator Start Relay 5A, 1/6 hp @ 250 Vac Vac 5A @ 30 Vdc with a 150W maximum load
K1, K2 Relays
10A, 1–3 hp @ 250 Vac

10A@30 Vdc
Applicable Testing UL-recognized component
UL 1008, UL 991 Environmental IEC 61000-4-2, 61000-4-3, 61000-4-4,
Applicable Testing Continued 61000-4-5, 61000-4-6, 61000-4-11
CISPR 11, Class B
FCC Part 15, Class B
CSS 22.2-178
Enclosure Compatibility NEMA 1, NEMA 3R and NEMA 12
UV-resistant ATC-100 faceplate

Performance Features

  • Source 1 sensing:
    • Undervoltage / underfrequency
    • Overfrequency

  • Source 2 sensing:
    • Undervoltage / Overfrequency

  • Controller settings via jumpers located at the rear of the unit
  • Mimic diagram with source available and connected LED indication
  • System test pushbutton
  • Plant Exerciser - Selectable day, off, 7, 14 or 28 day intervals with fixed 15 minute run time
  • Monitor utility and generator power source voltages and generator power source frequency
  • Provides undervoltage protection of the utility and generator power sources
  • Provides underfrequency and overfrequency protection of the generator power source
  • Permits easy customer setup
  • Permits system testing
  • In-phase transition