Selective trip arrangement utilizing circuit breakers which are coordinated with current limiting fuses

摘要

869,351. Protective cut-out systems; automatic circuit-breakers. I-T-E CIRCUIT BREAKER CO. March 18, 1958 [Aug. 16, 1957], No. 8683/58. Class 38 (5). A main circuit-breaker 100 is in series with two feeder circuit-breakers 102, 104 each provided with thermal and magnetic tripping devices and with current-limiting tripping fuses which operate at the higher short-circuit currents before the circuitbreaker 100 can trip. Branch circuit-breakers 106, 108, 110 also have tripping fuses which operate in the same manner with respect to the feeder circuit-breaker 104. The circuit-breakers may be of the kind described in Specification 869,424. Specification 783,366 also is referred to.