Which motor controller connects the load directly to the main supply line?

The across the line controller connects the load directly to the main supply line, which allows for the full voltage of the supply to be applied to the motor. This results in a quick start, as the motor receives the full supply voltage immediately upon activation, enabling it to reach its rated speed quickly. This method is simple to implement and is typically used for applications where the load demands can handle the starting current without causing damage or excessive stress on the motor or the connected machinery.

In contrast, other controllers like variable speed controllers and soft starters modify the power supplied to the motor to control its operation, either by varying speed or managing the starting current to reduce mechanical stress. A DC drive specifically controls DC motors and is not directly connected to the main supply line in the same way, as it requires a conversion process to handle the electric flow appropriately.