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MC4 connectors are single-contact electrical connectors commonly used for connecting solar panels. The MC in MC4 stands for the manufacturer Multi-Contact (now Stäubli Electrical Connectors) and the 4 for the 4 mm diameter contact pin. MC4's allow strings of panels to be easily constructed by pushing the connectors from adjacent panels together by hand and allow for a clean energy transfer between output cables from the solar array and connections to combiner boxes or inverters.