Ntt Facilities, Inc.

Furukawa Electric Power Systems Co., Ltd.

Mikio Yamasaki

Akira Matsumoto

Daisuke Yamada

Takashi Takeda

A connector etc. that prevents wrong insertion and does not require large rotation of plug etc., when inserting a plug to a socket, is provided. Plug-in connectorcomprises pin plugand receptacle, and pin plugand receptacleare connected. On pin cover bodyof pin plug, plural pin plug key protrusionsare constructed separately along the circumferential direction, and on socket coverof receptacle, plural sets-of plural key groovesseparated along the circumferential direction, that plural pin plug key protrusionsfit into each set, are arranged with shifting along the circumferential direction. Receptaclecan be substituted by a socket plug

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Mitaka, Japan

Mikio Yamasaki