| 摘要 |
PROBLEM TO BE SOLVED: To provide a relay connection structure which does not need to stop a power cable in operation when exchanging and inspecting a relay board for use in an electric protection circuit for an electric facility, is easy in the work of exchange and inspection, and allows various tests performed at each time to be easily performed. SOLUTION: The relay connection structure comprises: an external circuit; the relay board; and a relay connection box which is interposed between the external circuit and the relay board, and has a terminal device for switching the connection and release of the circuit and the board. The relay connection structure is constituted in such a manner that: the terminal device comprises an insertion/release free plug, and a main body which receives the plug; the main body comprises a plurality of sets of connection units each switching two paths by the insertion of the plug; and the plug comprises a plurality of sets of contactors contacting with the plurality of sets of connection units, and external terminals which correspond to the two paths drawn out of the contactors. COPYRIGHT: (C)2008,JPO&INPIT
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