Repeating circuit interrupter having fault indicating means

Claim 1

A POLYPHASE CIRCUIT INTERRUPTER INCLUDING MAIN SWITCH MEANS IN CIRCUIT WITH AN ELECTRIC SYSTEM, ABNORMAL CONDITION RESPONSIVE MEANS COUPLED TO SAID SYSTEM, SWITCH OPERATING MEANS COUPLED TO SAID ABNORMAL CONDITION RESPONSIVE MEANS FOR OPENING SAID MAIN SWITCH MEANS WHEN AN ELECTRIC QUANTITY IN SAID SYSTEM EXCEEDS A PREDETERMINED VALUE INDICATING AN ABNORMAL CIRCUIT CONDITION, A PLURALITY OF ABNORMAL CONDITION INDICATING MEANS, EACH OF SAID ABNORMAL CONDITION INDICATING MEANS BEING CONNECTED TO A DIFFERENT PHASE IN SAID SYSTEM AND INCLUDING CONDITION SENSING MEANS COUPLED TO ITS ASSOCIATED PHASE FOR DERIVING AN ELECTRICAL SIGNAL FUNCTIONALLY RELATED TO THE ELECTRICAL QUANTITY IN SAID PHASE, EACH OF SAID ABNORMAL CONDITION INDICATING MEANS ALSO INCLUDING LEVEL DETECTING INDICATOR MEANS CONNECTED TO SAID SWITCH OPERATING MEANS AND TO ITS SENSING MEANS AND OPERABLE TO PRODUCE AN INDICATION WHEN THE SIGNAL PRODUCED BY ITS SENSING MEANS EQUALS A PREDETERMINED VALUE REPRESENTATIVE OF AN ABNORMAL CONDITION IN ITS PHASE AND UPON THE OPENING OF SAID SWITCH MEANS, SAID LEVEL DETECTING INDICATOR MEANS BEING NONRESPONSIVE WHEN THE SIGNAL PRODUCED BY ITS SENSING MEANS IS LESS THAN SAID PREDETERMINED VALUE AND SAID SWITCH MEANS IS OPENED IN RESPONSE TO AN ABNORMAL CONDITION IN ANOTHER PHASE.