ATSE Controller
ATSE controllers monitor main and reserve power sources, control external transfer switches or contactor pairs and send a remote start/stop signal to a generator controller.
Depending on model, these controllers have various configuration settings, delays, voltage and frequency max/min limits. They could display measured parameters including voltage, frequency, current and power metered values.
Some models are able to control 3 power sources including mains, generators, inverters and other power sources in various combinations.