1. An electrical device that switches electrical circuits on and off, typically controlled by a low-voltage signal.
Usage: technical; commonly used in industrial and commercial electrical systems
2. A person or company that enters into a contract to provide goods or services.
Usage: business

Examples

• The electrician installed a new contactor to control the air conditioning system.
• The motor's contactor failed, causing the equipment to stop working.
• A contactor is essential in large industrial operations to manage heavy electrical loads.
• The building's HVAC system uses a contactor to regulate power to the compressor.
• When the thermostat signals for cooling, the contactor engages the air conditioning unit.