| 摘要 |
<p>The first switch is a snap-action switch operated by a pin and loaded by a spring. The second switch is in series with the first. The snap-action switch is operated by the pin first, and then the other switch. The second switch operates a make contact (17, 28), and the load (34) is in series with the first switch (4, 23, 25) and in parallel with the second (17, 28), connected to terminals (24, 29). As both switches are connected in series, when both of them are closed, an isolating device (26, 40) is inserted in series and causes a permanent interruption of the circuit.</p> |
