switcher

plural switchers

1. One who or that which operates a switch.

   They all love frugality and conservation; they are manic savers of bits of string and switchers-off of lights.

   1984, John Martin Robinson, The latest country houses, page 32

2. One who or that which switches, that is, changes in some way.

   career switcher

   3 more examples

   Switch to Acme brand razors for a closer shave! For a limited time, we'll pay you to be a switcher!

   As a career switcher, I diligently attended all the company presentations on campus, and quickly settled on sales and trading. My prior position was in hospital sales.

   2004, Gabriel Kim, Vault Career Guide to Sales & Trading, page 109

   In short, the task switcher gives you a way to jump directly to another app, without a layover at the Home screen first.

   2011, David Pogue, iPhone: The Missing Manual, page 14

3. businessA switchmode power supply.
4. USrail transportA railway locomotive used for shunting (switching).

   Synonyms: shunter, shunting engine, switch engine

5. UStruckingrail transportThe yardman who operates such an engine, or performs a similar role in a trucking depot.

   Synonyms: hostler, yard jockey, shunter, switchman

6. broadcastingSynonym of vision mixer (“device for selecting between video sources”).

   Synonyms: vision mixer