| 摘要 |
<p>An automatic switch wherein a pivotal switch lever is trippable by means of either a solenoid, a thermal element or a hand lever. The grip member of said hand lever extends out through an opening in the forward side of the switch housing which is configured to communicate the actual state of the switch contacts to an external observer, regardless of the position of the hand lever. This is achieved through the use of a window mounted in the forward section of the switch housing near the hand lever opening and in the region of the forward end of the pivotal switch lever, which bears a pivotal detent lever and an indicator strip. This strip has one section which is disposed directly behind the window when the switch lever is in a certain position, but when the switch lever is in its other position that section is displaced from the window, effectively making it invisible to an outside observer. Since the switch lever also contains the movable contact element of the switch (circuit-breakers),the position of said lever corresponds to the instantaneous position of the movable switch contact.</p> |
