Mitsubishi Denki Kabushiki Kaisha

Yoshiaki Matsumoto

Hiroshi Fujii

Masakatsu Suzuki

Haruhisa Toda

Setsuo Hosogai

Kazuyoshi Sugihara

Shinji Yokota

Shigeru Matsumoto

Shingo Maeda

Residual current operated circuit-breaker

A circuit breaker has a metal frame (10) disposed on a base of a housing. A trip-bar (6) made of molded plastic of like material is rotatably held on the frame (10) by insertion of a trip-bar pin (15) into a center through-hole provided on the trip-bar, and pinchers (14,14) of the trip-bar (6) pinch the trip-bar pin by elasticity of the plastic material to hold the same in place with very little lateral play.

Circuit breaker

An automatic trip device for a circuit breaker includes a U-shaped stationary iron core disposed around a current-carrying conductor. The stationary core includes a semicircular recess on one leg thereof having V-shaped bearing surfaces formed at each end of the recess. A movable iron core is positioned across the legs of the stationary core and includes semicircular projection fitted into the recess of the stationary core. A shaft extends through the projection and pivots at each end in one of the V-shaped bearing surfaces. Tension springs connected between the stationary core and one end of the movable core produce opening rotational bias on the movable core. Electromagnetic force produced by an over-current flow through the conductor causes closing rotational movement of the movable core. The disclosed construction results in elimination of undesireable sound vibrations produced in prior art devices under conditions of current flow below overload level.

Automatic trip device for circuit interrupter

Growing community of inventors

Fukuyama, Japan

Yoshiaki Matsumoto