(57) In a current-limiter electrical circuit breaker with contact opening by electrodynamic
repulsion, comprising at least a couple of contacts inserted between a power supply
terminal and a load terminal, the contact-holder arms of which form two branches substantially
parallel and closely approached to each other, through which currents of opposite
sign flow, a control mechanism kinematically linked to one of the two contact-holder
arms through a compound toggle lever formed by two sectors and a spring suitable to
pass from one side to the other side, and vice-versa, of a dead-point position, a
blocking device for the locking of the control mechanism in its active position,
and thermomagnetic devices suitable to act on a release device for the disengaging
of said blocking device; the hinge connecting the two sectors of the compound toggle
lever to each other is constituted by a limitedly sliding slot-pin coupling, and the
second one of the two contact-holder arms is linked to said release device through
a kinematic chain.
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