Insulation material : PPO Rated Voltage : TUV 1000 DC Rated Current : 20A-40A Test voltage : 6KV(50Hz,1Min) Contact material : copper, tin plated Contact resistance : less than 0.5 m ohm Degree of protection : IP67 Pin dimension : 4.0 MM Compatible Solar cable : 2.5/4.0 /6.0 mm⊃2; (14/12/10 AWG)