Explosion proof connectors are designed to be Custom in intrinsically safe circuits of categories "ia", "ib," and "ic" of explosion protection method "Ex .." The series can be Custom in Zones 0, 1, and 2 for gas and Zones 20, 21, and 22 for dust. The "Ex i" protection method guarantees intrinsically safe electrical circuitry that is limited for maximum voltage, current, capacity, and inductance.