Crane Duty Motors have been suitably designed for arduous applications for short and intermittent duties involving starts, stops and reversals.Crane Duty Motors are available in Aluminum Cast Iron frames. This motor operates at constant load for a given duration which is less than that required to reach thermal equilibrium and is followed by a rest or de-energized period such that the motor cools down to close to ambient temperature. The motors are designed for intermittent duty operations and different startsstops per hour as shown in the rating charts.