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Circuit-interrupter

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Circuit interrupter

Details

Inventors: Fujii, Hiroshi; Iio, Tsukasa; Genba, Yasusi; Moriwaki, Hideaki; Mochizuki, Yoshinori;
Assignee: Mitsubishi Denki Kabushiki Kaisha (JP)
Primary Examiner: Macon; Robert S.
Assistant Examiner:
Attorney, Agent or Firm: Leydig, Voit & Mayer

A circuit interrupter comprising a stationary contact assembly having a stationary contact element securely attached to a stationary conductor, and a movable contact assembly having a movable contact element secured on a movable contact arm and operable in response to an overcurrent between ON and OFF positions relative to the stationary contact assembly. An arc runner is attached to the stationary conductor by a single rivet and includes an elongated main body extending along the stationary conductor for expanding an electric arc generated between the movable and the stationary contact elements upon current interruption. The circuit interrupter further comprises a pair of tabs mounted to the arc runner for defining a pair of sloped engagement surfaces for receiving and positioning therebetween the stationary conductor when the stationary contact assembly is assembled.

DETAILED DESCRIPTION Accordingly, an object of the present invention is to provide a circuit interrupter in which even through only one rivet is used to secure the arc runner it is still prevented from rotating relative to the stationary conductor.
Another object of the present invention is to provide a circuit interrupter in which the arc runner can be securely mounted on the stationary conductor with simple assembly steps.
A further object of the present invention is to provide a circuit interrupter in which a good electrical contact relationship can be established with a simple structure.
With the above objects in view, the circuit interrupter of the present invention comprises a stationary contact assembly having a stationary contact element securely attached to a stationary conductor, and a movable contact assembly having a movable contact element secured on a movable contact arm and which is operative in response to an overcurrent between ON and OFF positions relative to the stationary contact assembly.
An arc runner is attached to the stationary conductor by a single rivet and includes an elongated main body extending along the stationary conductor for expanding an electric arc generated between the movable and the stationary contact elements separated upon current interruption.
The circuit interrupter further comprises a pair of tabs mounted to the arc runner for defining a pair of sloped engagement surfaces for receiving and positioning therebetween the stationary conductor when the stationary contact assembly is assembled.

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