contactor[kän′tak′tər, kän tak′-]
contactor definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Elec. a heavy-duty switching device, esp. a relay, used to open and close a circuit
contactor definition by American Heritage Dictionary
An electrical relay used to control the flow of power in a circuit.