Final answer:
A transfer switch is an automatic or nonautomatic device used to transfer load conductor connections from one power source to another. It is commonly used in backup power systems or generator installations to ensure uninterrupted power supply to connected loads.
Step-by-step explanation:
An automatic or nonautomatic device for transferring one or more load conductor connections from one power source to another is called a transfer switch. A transfer switch is commonly used in backup power systems or generator installations to switch between utility power and generator power. It ensures a seamless transition of power supply without interruption to the connected load. Transfer switches can be manual or automatic, with automatic transfer switches often being preferred for their ability to automatically detect and switch power sources.