1. AN IMPROVED CIRCUIT BREAKER FOR A CIGAR LIGHTER HAVING A SOCKET IN WHICH A REMOVABLE IGNITING PLUG HAVING A HEATING ELEMENT IS ADAPTED TO BE RECEIVED AND MANUALLY MOVED INTO POSITION TO BE HEATED AND A HEAT CONDUCTING TERMINAL HAVING CONTACT MEANS THEREON ENGAGING SAID IGNITING PLUG WHEN SAID IGNITING PLUG IS IN POSITION TO ENERGIZE SAID HEATING ELEMENT, AN IMPROVED CIRCUIT BREAKER COMPRISING: A TUBULAR HOUSING; A DISC OF INSULATING MATERIAL SECURED IN EACH END OF SAID HOUSING; A FIRST HEAT CONDUCTING TERMINAL MEMBER EXTENDING THROUGH AND SECURED TO A FIRST ONE OF SAID DISCS AND ADAPTED TO BE MOUNTED IN HEAT AND ELELCTRICAL CONDUCTING RELATION WITH THE CIGAR LIGHTER HEAT CONDUCTING TERMINAL; A SECOND TERMINAL MEMBER EXTENDING THROUGH AND SECURED TO THE SECOND OF SAID DISCS, AND ADAPTED FOR CONNECTION TO A SOURCE OR ELECTRICAL POWER; A SUPPORT MEMBER WITHIN SAID HOUSING SECURED TO SAID SECOND DISC IN ELECTRICAL CONNECTION WITH SAID SECOND TERMINAL MEMBER BY AN INNER PORTION THEREOF; A FIRST ELECTRICAL CONTACT FIXED ON SAID FIRST SUPPORT MEMBER IN ELECTRICAL CONNECTION THEREWITH; A THERMALLY-RESPONSIVE BIMETAL ELEMENT WITHIN SAID HOUSING SECURED TO SAID FIRST DISC AT ONE END IN HEAT AND ELECTRICAL CONDUCTING RELATION WITH SAID FIRST TERMINAL MEMBER BY AN INNER PORTION THEREOF, SAID BIMETAL ELEMENT HAVING A SECOND ELECTRICAL CONTACT FIXED ON ITS OTHER END IN ELECTRICAL CONNECTION THEREWITH AND NORMALLY ENGAGING SAID FIRST CONTACT, SAID BIMETAL ELEMENT BEING MOVABLE IN RESPONSE TO HEAT RECEIVED FROM SAID FIRST TERMINAL MEMBER UPON A PREDETERMINED HEATING OF SAID CIGAR LIGHTER HEATING ELEMENT TO DISENGAGE SAID SECOND CONTACT FROM SAID FIRST CONTACT; A U-SHAPED SPRING CLAMP MEMBER WITHIN SAID HOUSING HAVING A FIRST ARM SECURED TO SAID FIRST DISC