| 摘要 |
A molded case circuit breaker with manually operable ON-OFF handle means, and a separate rotatable trip testing button in an opening in the cover of the breaker casing and flush with the surface thereof. The trip testing button includes two parts which when assembled trap the button rotatably in the casing cover. The interior portion of the trip testing button has two angularly extending arms and is of resilient plastic material. One of the arms engages the circuit breaker trip bar when the button is rotated, and causes tripping. The other arm of the trip testing button is thin and elongated and serves to position the button in normal unoperated position and to act as a spring to return the button from trip operating position to its normal position. Positive stops are also provided for limiting rotation in each direction.
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