Non-interchangeability means for circuit breakers

Claim 1

A CIRCUIT BREAKER INCLUDING A HOUSING AND A FIRST MEANS ADAPTED TO COOPERATE WITH PANELBOARD MEANS WHEREBY SAID CIRCUIT BREAKER HOUSING CANNOT BE MOUNTED AT A PANELBOARD LOCATION FOR A LOAD OF LOWER CURRENT RATING THAN SAID CIRCUIT BREAKER CURRENT RATING; A MOUNTING RECESS IN SAID HOUSING, SAID MOUNTING RECESS HAVING A FIRST END TERMINATING AT THE EXTERNAL SURFACE OF SAID CIRCUIT BREAKER HOUSING, AND A SECOND END AT AN INTERNAL RECESS EXTENDING WITHIN SAID HOUSING, BEYOND THE RECEIVED LOCATION OF A MOUNTING HOOK, SAID MOUNTING RECESS ADAPTED TO RECEIVE AND SECURABLY MATE WITH A PANELBOARD MOUNTING HOOK AT A PREDETERMINED PANELBOARD LOCATION; SAID FIRST MEANS COMPRISING A NON-INTERCHANGEABILITY MEMBER INCLUDING A MOUNTING PORTION RIGIDLY SECURED TO SAID HOUSING AT SAID INTERNAL RECESS, AND A BLOCKING PORTION EXTENDING THEREFROM AND INTERNALLY LOCATED WITHIN SAID MOUNTING RECESS; SAID NON-INTERCHANGEABILITY MEMBER BEING CONSTRUCTED OF A MATERIAL SUBSTANTIALLY STRONGER THAN THE MATERIAL OF SAID HOUSING AND SECURED TO SAID HOUSING IN A MANNER WHEREBY AN ATTEMPT TO BREAK AWAY SAID NONINTERCHANGEABILITY MEMBER IN WHOLE OR PART RESULTS INSTEAD IN BREAKING AWAY OF A SUBSTANTIAL PORTION OF SAID HOUSING, INCLUDING SAID HOOK RECEIVING MOUNTING RECESS.