The MC4 connector (Multi-Contact, 4mm) is a widely used, standardized electrical connector in solar photovoltaic (PV) systems for connecting solar panels. Developed by the Swiss company Multi-Contact (now part of Stäubli), the MC4 connector is designed to simplify the connection of individual solar panels in a series or parallel configuration, making installation safer, faster, and more reliable.
The MC4 connector is now an industry standard for solar PV systems, bringing a combination of versatility, ease of installation, and long-term durability. Its design significantly streamlines the setup and expansion of solar panel installations, supporting the growing adoption of renewable energy technologies globally.