A common connector type used for establishing electrical connections between a vehicle and a trailer. Characterized by its circular configuration and four pins, it facilitates the transfer of essential lighting signals. For example, when a driver applies the brakes in the towing vehicle, the corresponding signal is transmitted through this connector to activate the trailer’s brake lights.
This component is vital for ensuring safe towing operations, particularly for smaller trailers such as those used for utility, cargo, or recreational purposes. Its widespread adoption stems from its simplicity, reliability, and cost-effectiveness. Historically, it provided a streamlined solution for basic trailer lighting requirements, contributing significantly to road safety and regulatory compliance.