Mitsubishi Denki Kabushiki Kaisha

Kazuyoshi Sugihara

Shinji Yamagata

Hiroshi Fujii

Masakatsu Suzuki

Setsuo Hosogai

Ichiro Arinobu

Yoshiaki Matsumoto

Shinji Yokota

Matsumoto Yoshiaki

Kazunobu Mihara

Shingo Maeda

Residual current operated circuit-breaker

A tripping device with burning prevention switch has a electromagnet 10 and a burning prevention switch 14 both of which are cased in each separate insulating bodies. The electromagnet 10 and the burning prevention switch 14 are combined by engagement of projections 15, 16, provided on the burning prevention switch 14 and a hollow 12 and a hole 13, respectively, that are provided on the electromagnet 10.

Tripping device with burning prevention switch

A circuit breaker having a thermal tripping device comprising a bimetal element and a heater has a holding member attached to the stationary part of the bimetal element, for holding the bimetal element and the heater at respective first end parts thereof. The holding member has an arm connected to a flexible copper wire and generates heat when an over-current flows through it, the arm conducting this heat to the attached end part of the bimetal element to cause the bimetal element to bend and deflect a second end thereof to provide circuit breaking action.

Circuit breaker

A handle lock device for a switch, to be mounted to a switch manipulation handle protruded through a handle manipulation opening of a case in which a switching mechanism of the toggle-type is contained, is a lock cover which has a portion elongated so as to be introduced into the handle manipulation opening, whereby the lock cover prevents sufficient handle swing to effect the switching, since one of the side surfaces of the elongated portion is adapted to abut one of the end surfaces of the handle manipulation opening before the toggle-link goes over its dead center. The handle lock device makes it possible that a single lock cover can be used to lock handles of switches having different angles in the 'on' and 'off' states, and also that the handle may be easily and simply locked by a locking means having a simple constitution.

Handle lock device for a switch

Growing community of inventors

Fukuyama, Japan

Kazuyoshi Sugihara