Description renogy MC4 branch connectors are used for parallel connection between solar panels. Sold as a pair, these “y-connectors†will maintain the voltage of your panel configuration to match your battery size. withstanding voltage: 1000V dc(tuv), 600v(ul) contact resistance: 1M unmating force: 147.51'·Lb insulation material: pc/PA contact material: copper, silver plated warranty information 1-year material warranty