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An MC4 connector is the industry-standard single-contact electrical connector used for connecting solar panels. The "MC" stands for the manufacturer Multi-Contact (now Stäubli Electrical Connectors), and the "4" refers to the 4 mm diameter of the contact pin.
Key Features
Weatherproof: They carry an IP68 rating, meaning they are dust-tight and waterproof, designed to withstand decades of outdoor exposure.
Locking Mechanism: They feature a "snap-in" safety lock that requires a special tool to disconnect, preventing accidental unplugging.
Universal Fit: Most modern solar panels come pre-installed with MC4 leads, making them "plug-and-play" for creating strings of panels.