Mechanically held electrically or manually operated switch
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United States of America Patent
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Jul 29, 1997
Grant Date -
N/A
app pub date -
Nov 22, 1995
filing date -
Nov 22, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An electric transfer switch includes a linear actuator operable to switch a plurality of movable contacts from a normal power supply to a standby emergency power supply, when the normal power supply has a power outage, so as to continuously serve electricity to electric loads. A plurality of leaf springs and an offset linkage angle help prevent any incidental disconnection between the moveable contacts and the stationary contacts. The transfer switch also includes a magnetic strip. The magnetic strip is magnetized when there is a 'fault' current passing by the contact tips of the moveable and stationary contacts. The attractive force between the magnetic strip and the moveable contacts due to the magnetization overcomes the repulsive force caused by the 'fault' current so as to make the contact between the moveable contacts and the stationary contacts unopenable. The transfer switch further includes a plurality of limit switches each of which is open or closed by a protrusion disposed on a crossbar carrying the moveable contacts.
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