1. A LATCH MECHANISM FOR CIRCUIT BREAKER; SAID CIRCUIT BREAKER INCLUDING A PAIR OF COOPERABLE CONTACTS, A LATCHABLE OPERATING MECHANISM CONNECTED TO ONE OF SAID CONTACTS FOR MOVING SAID ONE OF SAID CONTACTS BETWEEN AN ENGAGED AND DISENGAGED POSITION, AND AN AUTOMATIC CURRENT RSPONSIVE TRIP MEANS; SAID LATCH MECHANISM COMPRISING A FIRST LATCH MEANS, AN AUXILIARY LATCH MEANS AND A CURRENT MAGNITUDE SENSING MEANS; SAID FIRST LATCH MEANS CONNECTED FROM SAID AUTOMATIC CURRENT RESPONSIVE TRIP MEANS TO SAID LATCHABLE OPERATING MECHANISM AND BEING MOVABLE BETWEEN A LATCHING AND UNLATCHING POSITION WITH RESPECT TO SAID LATCHABLE OPERATING MECHANISM; SAID CURRENT MAGNITUDE SENSING MEANS INCLUDING CIRCUIT MEANS CONNECTED IN SERIES WITH SAID PAIR OF COOPERABLE CONTACTS; SAID AUXILIARY LATCHING MEANS BEING CONNECTED TO SAID LATACHABLE OPERATING MECHANISM AND BEING MOVABLE BETWEEN A LATCHING POSITION AND UNLATCHING POSITION RESPONSIVE TO THE CURRENT MAGNITUDE THROUGH SAID CURRENT MAGNITUDE SENSING MEANS; SAID AUXILIARY LATCHING MEANS MOVING TO ITS SAID UNLATCHING POSITION AFTER SAID FIRST LATCH MEANS MOVES TO ITS UNLATCHING POSITION AND RESPONSIVE TO A PREDTEREMINED CURRENT MAGNITUDE WHICH WILL DECAY TO A SUBSTANTIALLY ZERO VALUE AT THE TIME SAID LATCHABLE OPERATING MECHANISM MOVES SAID COOPERABLE CONTACTS TO THEIR SAID DISENGAGED POSITION.