Devices rated in horsepower are commonly referred to as?

Devices rated in horsepower are commonly referred to as starters. This terminology is particularly relevant in the context of electric motors where horsepower is a unit of measurement that indicates the motor's power output capability. Starters are devices designed to initiate the operation of electric motors, facilitating the transition from a standstill to full operational speed while also managing the electrical supply to the motor during this process.

The other terms—protectors, transformers, and converters—refer to different types of electrical devices with distinct functions. Protectors provide safety mechanisms to prevent electrical faults, transformers are used to change voltage levels in an electrical circuit, and converters typically change the form of energy from one type to another, such as AC to DC. Thus, while related to electrical systems, these terms do not directly connect to the concept of horsepower in motor operation.