MC4 Connectors by Multi-Contact (now Stäubli), are a single-pole connector system used to connect solar PV panels in multi-panel configurations. They consist of a male cable coupler (housing), female cable coupler (housing), socket contact, and pin contact. The contacts are crimped onto the solar cable, then assembled with the cable coupler housings before being mated together. More than 50% of the world’s PV power is installed using MC4 connectors (over 1 billion in total). For this reason, MC4s are often viewed as the standard connector in the solar energy industry.
