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.

Product Specs

Technical Summary

Switch Type
Switch application dependent
Transfer Type
Switch application dependent
Rating Range
120 to 600V, single phase and three phase @ 50/60 Hz

ATC Controller Specifications

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

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