Explosion-proof electrical unit

An explosion-proof electrical unit comprises an explosion-protected chamber for leading-in current conductors and an explosion-protected equipment chamber divided by a blast-resistant wall, and through current conducting terminals secured on the blast-resistant wall. The current conducting part of each terminal inlcudes at least two elements, of which one such element is movable. In one extreme position of the movable element this movable element and the fixed element are electrically closed, whereas in the other extreme position of the movable element they are open. A cavity formed between the movable and fixed elements of the current conducting part of each through terminal is explosion-protected.