This controller is commonly mounted on Cummins transfer switches (like the OTEC, GTEC, or RSS series) ranging from 40 Amps to 1,200+ Amps.
Depending on the operating voltage (e.g., 120V up to 480V) and the configuration of the switch cabinet it lives in, it can manage standby power systems ranging anywhere from small residential setups (~10 kVA to 50 kVA) to heavy commercial and industrial capacities (several hundred to over 1,000 kVA)