Mitsubishi Denki Kabushiki Kaisha

Yoshihiro Ookawa

Yoshinori Uchida

Coichi Shichida

Masahiro Arioka

Shinichi Miki

A vacuum circuit interrupter for use in a switchgear connectable to a three-phase ac power system and having for each phase a vacuum valve including a pair of separable electrodes supported within a hermetic vessel by an electrode. Axes of the vacuum valves for three phases are arranged in parallel and at apexes of a triangle. Electrically insulating barriers are disposed for supporting and electrically insulating the vacuum valve from another vacuum valve in another phase and from the hermetic vessel.

Vacuum circuit interrupter

A terminal connection device comprising: a first terminal; a terminal contact member composed of a plurality of contact pieces, each contact piece having a first contact surface and a second contact surface, the plurality of contact pieces being arranged on an outer circumference of the first terminal so that the first contact surface and the first terminal can be contacted with each other; a guide plate located between the first contact surface and the second contact surface, recesses being formed on the guide plate at regular intervals in the outer circumferential direction; and a pushing means for pushing the terminal contact member from the outside of the terminal contact member, in that contact pieces are arranged in the recesses formed on the guide plate, the first terminal and the second terminal are electrically connected with each other when the second terminal is inserted into the terminal contact member so that the second contact surface and the second terminal can be contacted with each other, and a protrusion is formed on the side of the contact piece.

Terminal connection device

A switchgear comprising an electrically insulating frame having an operating mechanism accommodated at its front portion and having a main circuit accommodated at its rear portion. The insulating frame defines a space surrounded at three sides by opposing side insulating walls and a rear insulating wall arranged substantially in a U-shaped cross section. The insulating frame also supports a switch portion within the space and supports a terminal conductor leads from the switch portion extending through the rear insulating wall to project toward the rear of the switchgear. The switchgear also comprises an electrically insulating cover covering at a front side of the insulating frame at least the rear end, the top end and the opposing side ends of the operating mechanism. Also, the switchgear may comprises a face plate disposed to a front portion of the switchgear and an operating mechanism disposed between the face plate and the insulating frame. Therefore, the insulating distance between the components can be made small and no metal casing is necessary, allowing the switchgear to be small-sized and simple in structure.

Growing community of inventors

Tokyo, Japan

Yoshihiro Ookawa