Electric transfer switch having three-position toggle mechanism
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United States of America Patent
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Jun 17, 1997
Grant Date -
N/A
app pub date -
Jun 5, 1995
filing date -
Jun 5, 1995
priority date (Note) -
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Abstract
An electric transfer switch includes a three-position toggle mechanism and a crossbar which is mounted on the toggle mechanism. The crossbar carries a plurality of moveable contacts and is rotated by the toggle mechanism. The moveable contacts normally contact one set of the stationary contacts in one closed position which are connected to a normal main power supply. The moveable contacts are rotated to a neutral non-power line in an open position, and are further rotated to another closed position, which are connected to a standby emergency power supply to supply electricity to the transferred electrical loads. The toggle mechanism includes a multi-bar linkage which is rotated by a handle of the toggle mechanism among the open position and two closed positions. A plurality of springs and catches are used to maintain the contact between the moveable contacts and the stationary contacts, even when a 'fault' current passes through the contact tips of the moveable and stationary contacts.
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