American four hole socket NEMA14-50R UL Category:American Series > Industrial plug and socket 13868759177 / 13868895688 / 13736999786 13868759177@163.com Contact Us Technical Parameter 1.Rated: 125V/250VAC 50A; 2.Contact resistance: R1≤50MΩ; 3.Insulation resistance: R2≥500MΩ; 4.Withstand voltage: AC2500V(50-60Hz); 5.Insertion and extraction life: 20000 times;