contactor

An electrician installs a new contactor in an electrical panel.

Definition

1. Noun:
   • An electrical device: A "contactor" is an electrically controlled switch used for switching an electrical power circuit, similar to a relay but with higher current ratings and often used for controlling motors, lighting, heating, and other heavy loads.
   • A component in control systems: In industrial and commercial settings, a "contactor" is a device that makes or breaks electrical connections repeatedly, typically operated by an electromagnetic coil.

Usage Examples

• (The switch that controls the power to the motor.)
• (A device that uses a magnetic coil to open and close a circuit.)

Advanced Usage

• "Electromagnetic contactor": A specific type of contactor that uses an electromagnet to mechanically operate the switch contacts.

  • The factory upgraded to an electromagnetic contactor for better reliability. (A contactor powered by a magnetic coil.)

• "Power contactor": A contactor designed to handle high voltage and current levels.

  • A power contactor is used in the main distribution panel. (A heavy-duty switch for large electrical loads.)

Variants and Related Words

• Contact (n): the state of physical touching; a connection between two electrical conductors.

  • Ensure the wires make good contact. (A proper electrical connection.)

• Contactor (n): the specific device itself; no common variants exist as it is a technical term.

Synonyms

• Switch: a device for making and breaking the connection in an electric circuit.
• Relay: an electrically operated switch, though typically for lower currents than a contactor.

Phrasal Verbs

• Contact in: (rare) to establish a connection using a contactor.

  • The system will contact in the motor when the start button is pressed. (The contactor will close the circuit.)

• Contact out: (rare) to disconnect using a contactor.

  • The safety mechanism contacts out the power supply. (The contactor opens the circuit.)

Related Idioms