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Title:
ELECTROMAGNETIC TRIP DEVICE AND CIRCUIT BREAKER
Document Type and Number:
Japanese Patent JP2016167389
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an electromagnetic trip device and a circuit breaker in which the operation time in a motor starting current region is slower as compared with a prior art, and the operation time in a low over-current region and a short-circuit current region is the same level as the prior art.SOLUTION: A cylinder 1, a plunger 2, a brake spring, a pole head 4, an electromagnetic coil 5, a yoke 6, and armature 7 are provided. A magnetic material piece 8 is provided between the yoke 6 and the pole head 4, is connected to the yoke 6 and extends from the yoke 6 to the pole head 4, thereby delaying the operation time in a motor starting current region.SELECTED DRAWING: Figure 2

Inventors:
NISHIHARA SHINO
OKADA KENJI
KAGAWA TAKUYA
MURAKAMI HIROAKI
Application Number:
JP2015046577A
Publication Date:
September 15, 2016
Filing Date:
March 10, 2015
Export Citation:
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Assignee:
PANASONIC IP MAN CORP
International Classes:
H01H73/36; H01H71/24; H01H71/44
Domestic Patent References:
JPS5217661A1977-02-09
JPS53159570U1978-12-14
JPS63102160U1988-07-02
JPS5943055U1984-03-21
JPH0686303U1994-12-13
JPS5152861U1976-04-22
Attorney, Agent or Firm:
Kenji Kamada
Hiroo Maeda