MC4 Connector The MC4 connector is a single-contact electrical connector commonly used for solar connecting,rated for 1000V. The newer versions are rated at 1500V, which allows longer strings to be created. They are divided into wire ends and board ends. Generally

speaking, MC4 refers to wire ends.

MC4 is composed of metal parts and insulating parts. After the MC4 and the cable are
connected, it needs to be tested. Under normal circumstances, the resistance is zero,
and it will not break if you pull it hard with both hands.