Which of the following describes a motor-circuit switch?

A motor-circuit switch is specifically designed for the operation and control of motors. The correct choice indicates that these switches are rated in horsepower, which is a measurement of the power that motors require to operate effectively. This rating is crucial because it ensures that the switch can handle the load imposed by the motor’s startup and operational demand without overheating or failing.

Motor-circuit switches also typically have particular features that accommodate motor loads, such as the ability to interrupt high inrush currents when a motor starts. They are not the same as general-use switches, which may not be rated for the higher loads or startup currents associated with motors.

By focusing on the rating in horsepower, it's clear that the switch is specifically designed to handle the electrical requirements unique to motors, which distinguishes it from other types of switches that might be used in lighting or general circuits.