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    • 4. 发明专利
    • Circuit breaker
    • JP5354618B2
    • 2013-11-27
    • JP2011284146
    • 2011-12-26
    • テンパール工業株式会社
    • 茂 相原忠孝 林保徳 濱井悠磨 奥谷
    • H01H71/74H01H73/48H01H83/02H01H83/20
    • PROBLEM TO BE SOLVED: To provide a circuit breaker having a current limiting function in which it is hard to illegally use and modify, and when regularly changing a contract current, an operation current according to the contract current can be changed easily without requiring replacement work of an existing installed apparatus. SOLUTION: A circuit breaker 1 comprises: in a device body 101, first and second current transformers 105 and 106 each provided in an electric path 10 of a plurality of phases, for detecting the magnitude of a load current; an opening and shutting mechanism 103 for opening and shutting the electric path; an operation handle operating in an interlocking fashion with the opening and shutting mechanism; tripping means 104 for performing a tripping operation when a predetermined current flows in the electric path; a trip coil 109; a current setting section 201 for variably setting a threshold value of a current for operating the trip coil; and an operation control section 108 for performing predetermined time-limit characteristic control when the magnitude of the load current is greater than the set current value. COPYRIGHT: (C)2012,JPO&INPIT