(57) A double-pole circuit breaker (1) for enclosed boxes of civil range electric equipment
has longer life and comprises, within a body (8), neutral (15) and protected (14)
poles, moving (23,19) and fixed (22,18) contacts for each pole (15, 14), a diaphragm
(3) in said body (8), two chambers (34,33) formed in said body (8) on opposed sides
of the diaphragm (3) and being each adapted to accommodate a respective one of said
moving contacts (23,19) for movement therein through a preset path (T) toward and
away from a respective one of the fixed contacts (22,18), a throughgoing socket (35)
in said diaphragm (3), and a metal crosspiece (37) having a middle portion inserted
in said socket (35) and end portions (39,38) overhanging in said chambers (34,33)
at a location facing said path (T).
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