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Title:
DISCONNECTION DETECTION DEVICE OF TRIP OPERATION CIRCUIT OF SWITCHING DEVICE
Document Type and Number:
Japanese Patent JP2009303397
Kind Code:
A
Abstract:

To provide a cost-effective and highly reliable disconnection detection device of a trip operation circuit that is used for an electronic controller circuit breaker whose trip operation is performed with a micro current.

The disconnection detection device includes an input circuit, which is connected to one terminal of a control power supply via a first connecting wire and which gives a trip command to a switching device, and a disconnection detection means, which is connected to the other terminal of the control power supply via a second connecting wire and to the input circuit via a third connecting wire and which detects the disconnection of one of the first, second, and third connecting wires. A parallel resistor, which shunts a current of the trip operation circuit, is connected to the input circuit so as to regulate a current flowing in the input current to be insufficient in giving the trip command in the closed state of the switching device.


Inventors:
INOUE RYUICHI
Application Number:
JP2008155551A
Publication Date:
December 24, 2009
Filing Date:
June 13, 2008
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
H02H3/05; G01R31/02
Domestic Patent References:
JP2000354322A2000-12-19
JPS63265513A1988-11-02
JPS6062724U1985-05-02
JPS63137873U1988-09-12
Attorney, Agent or Firm:
Masuo Oiwa
Kodama Toshihide
Takenaka Takeo
Keigo Murakami