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The MC4 connector is a single contact electrical connector. They are often used to connect solar panels. MC4 stands for "Multi-Contact, 4mm". It is the standard in the renewable energy industry. MC4 connectors make it easy to build photovoltaic panel arrays. In today's solar market, ?MC4 connectors and their compatible products are widely used. In most cases, larger solar panels are already equipped with MC4 connectors. They are made by Multi-Contact, the official manufacturer of MC4 connectors. Solar panels are plastic based circular housings with single conductors in a paired male/female configuration. With the help of the notch interlock, the MC4 connectors are able to be terminated with each other, preventing accidental pulling apart.