MULTIPOLE CIRCUIT BREAKER WITH SINGLE-POLE UNITS MULTIPOLE CIRCUIT BREAKER WITH SINGLE-POLE UNITS

摘要

A low voltage multipole circuit breaker with double housing, each pole of which comprises, a single-pole breaking unit having a parallelepipedic box with two large side faces, made of molded plastic material, and contacts, associated with an extinguishing chamber housed in the unit, several units being mounted side by side in a molded case to form the multipole circuit breaker. A movable contact is arranged as a rotating contact bridge which cooperates with two opposing stationary contacts, the contact bridge being supported by a rotating bar section, which extends transversely appreciably in the center of the box being inserted between and laterally guided by the two large side faces of the box while being able to move in limited translation parallel to these large faces. The bar sections of the different juxtaposed units are mechanically secured by two parallel connecting bars which extend perpendicularly to said large faces and pass with small clearance through diametrically opposed orifices arranged in the successive bar sections, the two connecting bars being coupled to a crank with two diametrically opposed arms, and an operating mechanism, fixed to the upper part of one of the units, comprises two metal flanges supporting the bearings of said crank and a bottom connecting rod actuating said crank.