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The ATC-300+ 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-300+ Controller provides programmed flexibility to address the needs of any system. It operates from all system voltages between 120 to 600V, single-phase and three-phase at 50 or 60 Hz. In addition, a period of no control power is provided. The controller monitors the condition of the three-phase line-to-line voltage and frequency of Source 1 and Source 2 power sources and can be programmed for single-phase operation. The ATC-300+ Controller provides the intelligence to ensure that the ATS operates properly through a series of programmed sensing and timing functions.




  • 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 65 to 145 Vac 50/60 hZ
    Voltage Measurements of Utility Source 1 VAB Source 2 VAB
    Source 1 VAC Source 2 VBC
    Source 1 VCA Source 2 VCA
    Voltage Measurement Range 0 to 790 VAC rms (50/60 Hz)
    Voltage Measurement Accuracy +/-2% of nominal input voltage
    Frequency Measurements Of Source 1 and Source 2
    Frequency Measurement Range 40 Hz to 70 Hz
    Frequency Measurement Accuracy +/- 0.1 Hz
    Undervoltage Dropout 50% to 90% of nominal voltage
    Undervoltage Pickup (Dropout +2%) to 99% of the nominal system voltage
    Underfrequency Dropout Range 90 to 97% of the nominal system frequency
    Underfrequency Pickup Range (Dropout +1 Hz) to 99% of the nominal system frequency
    Overfrequency Dropout Range 103 to 110% of the nominal system frequency
    Overfrequency Pickup Range 101% to (dropout - 1 Hz) of the nominal system frequency
    Operating Temperature Range -20 to 70 degree C (-4 to +158 degree F)
    Storage Temperature Range -30 to 85 degree C (-22 to +185 degree 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
    Meets intent of UL 991 & UL 1008
    Meets IEC 1000-4-2, 1000-4-3, 1000-4-4
    Applicable Testing Continued 1000-4-5, 1000-4-6, 1000-4-11
    CISPR 11, Class A
    FCC Part 15, Class A
    CSS 22.2-178
    Enclosure Compatibility NEMA 1, NEMA 3R and NEMA 12
    UV-resistant ATC-300+ faceplate