OVERCURRENT TRIPPING DEVICE AND CIRCUIT BREAKER EMPLOYING SAME

WIPO Patent Application WO/2016/204104

A1

The objective of the invention is to obtain an overcurrent tripping device with which it is possible to reduce the tripping time in response to a fault current, and to reduce the size of the device. This overcurrent tripping device, which detects an overcurrent flowing through a main circuit of a circuit breaker and actuates a tripping mechanism of a circuit breaker that is in a closed state, includes: tripping conductors (5) connected to the main circuit; a fixed iron core (4) through which the tripping conductors (5) penetrate, and which is energized by the excitation of the tripping conductors (5); a movable iron core (7) which is disposed facing the fixed iron core (4) across a magnetic gap, forms a magnetic circuit in cooperation with the fixed iron core (4), and is moved by being attracted by the fixed iron core (4) when an overcurrent flows through the tripping conductors (5); and a shaft (6) which is secured to the movable iron core (7), guides the movement of the movable iron core (7) and is linked to the tripping mechanism of the circuit breaker. Slits (4a) are formed in the fixed iron core (4) in a direction crossing the magnetic circuit, and magnetic saturation is suppressed by means of the slits (4a).

JP3240322	On-site power switchgear to ensure personnel safety
JP5568895	Circuit breaker

SASAKI HIROSHI (JP)
SAGARA YUTA (JP)

PCT/JP2016/067484

December 22, 2016

June 13, 2016

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MITSUBISHI ELECTRIC CORP (JP)

H01H33/42; H01H71/24; H01H73/36

US3024330A	1962-03-06
JPH01315923A	1989-12-20
EP2431992A1	2012-03-21
DE19715114A1	1998-10-22
US8497750B2	2013-07-30
JPS63129932U	1988-08-25

See also references of EP 3312865A4

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

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