Vacuum switch with pre-insertion contact
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United States of America Patent
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May 21, 2013
Grant Date -
Jul 12, 2012
app pub date -
Jan 7, 2011
filing date -
Jan 7, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A vacuum switching device with pre-insertion contact arrangement is disclosed. The vacuum switch includes first and second contact systems. The first contact system includes an annular stationary contact and an annular moving contact retained on a moving contact drive rod. A second contact system includes a moving contact retained on an end of the moving contact drive rod and a floating contact retained along the same axis as the second moving contact. Both contact systems are enclosed in a vacuum envelope. A mechanical adjustment system is provided for the floating contact, which allows it to be positioned so that the secondary moving contact and floating moving contact may engage at a set interval before the annular moving contact engages the annular stationary contact. A resistor or inductor is connected between the second contact system and a load to prevent a current in-rush into the load.
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