8533.40.80.40 - Rheostat and resistor type motor starters and controllers

This classification covers rheostats and variable resistor-type motor starters and controllers. These devices are designed to regulate motor speed or torque by varying the resistance in the motor circuit. They are distinct from fixed resistors, as their resistance can be adjusted during operation. Examples include manual rheostats used for speed control in industrial equipment or electronic motor controllers that employ variable resistance principles for starting and running motors.

While the parent category "Other variable resistors, including rheostats and potentiometers" encompasses a broad range of adjustable resistors, this specific subcategory zeroes in on those units whose primary function is as a motor starter or controller. This differentiates them from general-purpose variable resistors or potentiometers that might be used for signal adjustment or calibration in other electronic applications. The key criterion for inclusion here is their direct application in the starting, stopping, or speed regulation of electric motors.

As a leaf node, there are no further subdivisions. Therefore, classification within 8533.40.80.40 is determined by the explicit function of the device as a motor starter or controller. If a variable resistor is not designed or primarily used for this purpose, it would fall under a different classification within the broader categories of variable resistors.