Tripping arrangement for an electric circuit breaker

Claim 1

AN ELECTRIC CIRCUIT BREAKER FOR CONTROLLING A POWER LINE COMPRISING CURRENT-SENSING MEANS FOR DERIVING FROM SAID POWER LINE A UNIDIRECTIONAL SIGNAL VOLTAGE HAVING A MAGNITUDE VARYING AS A DIRECT FUNCTION OF THE MAGNITUDE OF CURRENT IN SAID POWER LINE, A NORMALLY-INACTIVE TIMING CIRCUIT INCLUDING CAPACITIVE MEANS FOR DEVELOPING AN OUTPUT VOLTAGE THAT BUILDS UP AT A RATE DEPENDENT UPON THE MAGNITUDE OF THE INPUT VOLTAGE APPLIED TO THE TIMING CIRCUIT ONCE SAID TIMING CIRCUIT IS RENDERED ACTIVE, MEANS FOR APPLYING SAID SIGNAL VOLTAGE TO SAID TIMING CIRCUIT AS AN INPUT VOLTAGE, MEANS NORMALLY PROVIDING A LOW IMPEDANCE DISCHARGE CIRCUIT AROUND SAID CAPACITIVE MEANS WHEN SAID CIRCUIT BREAKER IS CLOSED TO RENDER SAID TIMING CIRCUIT INACTIVE, A GATING RELAY HAVING A CONTROLLING PART ARRANGED TO BE ENERGIZED BY SAID SIGNAL VOLTAGE AND A SET OF NORMALLY-CLOSED CONTACTS CONNECTED IN SAID DISCHARGE CIRCUIT, SAID GATING RELAY BEING OPERABLE IN RESPONSE TO AN INCREASE IN SAID SIGNAL VOLTAGE TO A PREDETERMINED VALUE TO OPEN SAID CONTACTS TO INTERRUPT SAID DISCHARGE CIRCUIT AND RENDER SAID TIMING CIRCUIT ACTIVE, A LEVEL DETECTOR THAT FIRES IN RESPONSE TO AN INCREASE IN SAID OUT-