Utilization categories
Utilization Category Type of Application AC-1 Non-inductive or slightly inductive loads, example: resistive furnaces, heaters AC-2 Slip-ring motors: switching off AC-3 Squirrel-cage motors: starting, switches off motors during running time AC-4 Squirrel-cage motors: starting, plugging, inching AC-5a Switching of discharge lamps AC-5b Switching of incandescent lamps AC-6a Switching of transformers AC-6b Switching of capacitor banks AC-7a Slightly inductive loads in household appliances: