Enter motor data, then select an overload. The logic changes based on the overload type ( Bimetallic, Electronic, or Definite Time) Note that this tool is not intended as a final design check. It is designed to quickly check if a motor/overload combination may be suitable. There are inherent errors in the approach that this calculator takes. The overload curves are stored as a series of points, and the intercept points are linearly interpolated. This will create errors where the displayed trip time will be longer than the actual value from the curve. Always check the manufacturer curves before selecting a motor/overload configuration!.