CIRCUIT BREAKER

WIPO Patent Application WO/2014/010040

A1

[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.

DEGUCHI TOMOYA (JP)
KUROSAKI TAKESHI (JP)
KISHIMOTO YASUO (JP)

PCT/JP2012/067686

January 16, 2014

July 11, 2012

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MITSUBISHI ELECTRIC CORP (JP)
DEGUCHI TOMOYA (JP)
KUROSAKI TAKESHI (JP)
KISHIMOTO YASUO (JP)

H01H71/16; H01H73/22; H01H83/02

JP2011175926A	2011-09-08
JPH09282997A	1997-10-31
JP2002260515A	2002-09-13
JPS62153746U	1987-09-29
JPH06215682A	1994-08-05

OIWA Masuo et al. (JP)
Masuo Oiwa (JP)

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