Material Copper Usage/Application Solar System Size 1 inch Connection Male Voltage 1500VDC Current 50A Temperature Range 40 C TO + 90 C Color Black Standards EN 50521 : 2008 Packaging Type Box Connector Type Y Type Country of Origin Made in India CONTACT RESISTANCE < 0.5m DEGREE OF PROTECTION IP67 ONTACT MATERIAL COPPER WITH TIN PLATED INSULATION MATERIAL PPO LOCKING SYSTEM SNAP-IN FLAME CLASS UL94-HB / UL94-VO CABLE SIZE 2.5 TO 6 MM PROTECTION CLASS II APPLICATION CLASS CLASS A MC4 connectors are single-contact electrical connectors commonly used for connecting solar panels. The MC in MC4 stands for the manufacturer Multi-Contact (now Stäubli Electrical Connectors) and the 4 for the 4 mm diameter contact pin.