MC4 Electronic Connectors are standardized single-contact electrical connectors commonly used for connecting solar panels. Their name "MC4" stands for Multi-Contact, 4mm diameter, reflecting their origin and design specifications. MC4 connectors are primarily used in solar photovoltaic (PV) systems for linking solar panels in series or parallel. They ensure a secure and efficient connection between components, enhancing the system's overall safety and performance. MC4 Electronic Connectors are weatherproof, single-contact connectors widely used in solar photovoltaic systems.