Switcher (noun)

1. A device for switching, especially one used to switch electrical circuits or routes of trains.
2. A person who operates a switching device.

Origin:

Late 19th century, from switch + -er.

Examples:

1. The electrician installed a new switcher to control the lights in the room.
2. The train switcher guided the train onto the correct track.
3. The computer network required a specialized switcher to handle the high-speed data transfers.
4. The switchyard had several switchers working to direct the trains to their destinations.
5. The cable service provided a remote switcher for customers to easily change channels.