Genuine Stäubli MC4 Panel Mount Connectors for Secure Solar Enclosures Establishing a secure, weather-tight connection through a combiner box, campervan chassis, or distribution board requires highly engineered components. The Stäubli Bulkhead MC4 Connector Pair delivers a professional, panel-mounted solution for passing solar cables through rigid surfaces. As the original inventor of the MC4 standard, Stäubli provides precision-engineered solar connectors that...