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Title:
電子式回路遮断器
Document Type and Number:
Japanese Patent JP5289648
Kind Code:
B2
Abstract:
Provided is an electronic circuit breaker, having a tripping device using an electronic circuit and an electromagnetic tripping device, capable of determining that a current value has failed to be measured accurately because excessive current has flowed on an AC electric path. The electronic circuit breaker includes: a timing circuit 11 for outputting a trip signal for opening an open-close contact 2, a predetermined time after current flowing on an AC electric path 1 has exceeded a predetermined value; an electronic tripping device 3 for opening the open-close contact 2 by being energized by the trip signal; an electromagnetic tripping device 4 for opening the open-close contact 2 faster than the first tripping device 3 by being electromagnetically energized by excessive current flowing on the AC electric path 1; and an alarm device 5 for generating an output signal when the open-close contact has been opened by the electronic tripping device 3 or the electromagnetic tripping device 4. The timing circuit 11 receives the output signal from the alarm device 5, and based on the timing of generation of the output signal, determines whether or not measurement of a fault current value based on the output signal from current detection means 6 is accurate.

Inventors:
Toshimitsu Nomura
Mori Mitsugu
Keita Hamano
Application Number:
JP2013513879A
Publication Date:
September 11, 2013
Filing Date:
May 24, 2011
Export Citation:
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Assignee:
Mitsubishi Electric Corporation
International Classes:
H01H83/02; H01H9/54
Domestic Patent References:
JP2008204631A2008-09-04
JP2008186592A2008-08-14
JP2006202534A2006-08-03
JP2002140974A2002-05-17
Attorney, Agent or Firm:
Masuo Oiwa
Takenaka Ikuo
Keigo Murakami
Kenji Yoshizawa