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Title:
CIRCUIT BREAKER
Document Type and Number:
WIPO Patent Application WO/2014/010040
Kind Code:
A1
Abstract:
[Problem] To obtain a circuit breaker equipped with a thermomotive electromagnetic tripping device having a small size and capable of increasing the temperature of a bimetal during a tripping operation by overcurrent. [Solution] The circuit breaker comprises: an opening and closing mechanism unit (7) for driving to open and close the contact points of a movable contact (6) and a fixed contact (5) used for opening and closing three-phase electric paths; an electromagnetic tripping device for driving a trip bar when overcurrent flows through the electric paths to trip the opening and closing mechanism unit (7); and thermomotive tripping devices (11) for driving the trip bar (14) by using bimetals (12) bending when the overcurrent flows through the electric paths to trip the opening and closing mechanism unit (7). In the circuit breaker, the thermomotive tripping devices (11) are provided at three poles provided adjacent to each other and corresponding to the three-phase electric paths, and among the bimetals (12)of the thermomotive tripping devices (11) at the respective poles, the plate thickness of at least one bimetal is differentiated from those of the other bimetals.

Inventors:
DEGUCHI Tomoya (7-3 Marunouchi 2-chome, Chiyoda-k, Tokyo 10, 〒1008310, JP)
KUROSAKI Takeshi (7-3 Marunouchi 2-chome, Chiyoda-k, Tokyo 10, 〒1008310, JP)
KISHIMOTO Yasuo (1-13-5 Kudankita, Chiyoda-k, Tokyo 73, 〒1020073, JP)
Application Number:
JP2012/067686
Publication Date:
January 16, 2014
Filing Date:
July 11, 2012
Export Citation:
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Assignee:
Mitsubishi Electric Corporation (7-3 Marunouchi 2-chome, Chiyoda-ku Tokyo, 10, 〒1008310, JP)
DEGUCHI Tomoya (7-3 Marunouchi 2-chome, Chiyoda-k, Tokyo 10, 〒1008310, JP)
KUROSAKI Takeshi (7-3 Marunouchi 2-chome, Chiyoda-k, Tokyo 10, 〒1008310, JP)
KISHIMOTO Yasuo (1-13-5 Kudankita, Chiyoda-k, Tokyo 73, 〒1020073, JP)
International Classes:
H01H71/16; H01H73/22; H01H83/02
Foreign References:
JP2011175926A
JPH09282997A
JP2002260515A
JPS62153746U
JPH06215682A
Attorney, Agent or Firm:
OIWA Masuo et al. (35-8, Minamimukonoso 3-chomeAmagasaki-sh, Hyogo 33, 〒6610033, JP)
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