MC3 connector

MC3 are named for the original manufacturer Multi-Contact (now part of Stäubli Electrical Connectors) with a 3 mm contact assembly pin.

The MC3 connectors incorporate a flexible watertight seal and are supplied as 'male' and 'female' types the prevent cross-connections.

For proper application usage, they must be terminated to accurately sized UV resistant, correct diameter cable.

In 2008, NEC banned the opening of PV connectors under load as the push-fit connectors were required to contain positive locking mechanisms controlled by certified, product-specific tools.

The MC3 PV connector did not meet these requirements, but its successor, MC4 PV connectors, which were launched in 2004 provided the fundamental mechanism  leading to widespread market acceptance.