This video explains the main functions and practical uses of the Marathon 400kW high-voltage motor (HAA 4003) in a clear, step-by-step format. We walk through its IC611 air-to-air cooling system, show how the welded-steel frame and Class F IP55 protection support continuous duty, and demonstrate the Pt100 temperature monitoring setup. You'll also see typical applications for pumps, compressors, and fans, plus starting options for different grid capacities.