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.

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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
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