A switch rated in horsepower capable of interrupting maximum overload current is referred to as what?

A switch rated in horsepower and capable of interrupting the maximum overload current is known as a motor-circuit switch. This type of switch is specifically designed for use in motor applications, allowing it to handle the high inrush currents associated with starting motors, as well as any overload conditions that may occur during operation.

Motor-circuit switches are essential for ensuring the safe control of motors by providing a means to disconnect the motor from the power supply, especially in situations where protection against overload is needed. They generally incorporate features that allow them to withstand the electrical and mechanical stresses placed upon them during motor operation.

In comparison, other types of switches have different design criteria and applications. General-use switches are not rated specifically for the higher currents associated with motor operations. An isolating switch is intended for making or breaking circuits under load to isolate electrical equipment for maintenance but does not specifically address motor performance. A transfer switch is used to switch between different power sources but is not primarily concerned with the requirements needed for motor control. Hence, the designation of "motor-circuit switch" is specifically appropriate for switches that are engineered to meet the demands of motor applications.