Mitsubishi Denki Kabushiki Kaisha

Akiyoshi Onuma

Toshiaki Yoshizumi

Takashi Yonezawa

Kiyoshi Yabe

Mamoru Hosomi

Ichiro Yamasaki

In an interrupter, an insulated nozzle is disposed in the vicinity between a pair of contact elements and is adapted to extinguish an arc occurring between the contact elements by blowing an insulating gas thereto. This insulated nozzle is formed from a fluoroplastic and boron nitride mixed thereinto, the mixed proportion of boron nitride being within a range of weight percentages of 0.3 to 1.0.

Insulated nozzle for use in an interrupter

A spring operating mechanism for a circuit interrupter comprises means for converting the rotation of an electric motor into a rocking motion of a pawl, a ratchet wheel having teeth for being engaged by the pawl to be rotated by the rocking motion of the pawl and a closing spring which is charged by the rotation of the ratchet wheel, whereby energy charged in the closing spring is used for the closing and the tripping of the circuit interrupter. The mechanism comprises a catch arranged to come into engagement with the tip of the pawl when the tip of the pawl begins to ride on a large-diameter outer circumferential toothless portion of the ratchet wheel and to be brought out of the above engagement by the rocking motion of the pawl.

Growing community of inventors

Amagasaki, Japan

Akiyoshi Onuma