Control panel for automatic transfer switch
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 19, 1980
Grant Date -
N/A
app pub date -
Dec 1, 1978
filing date -
Dec 1, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control panel, formed entirely of solid state components, for an automatic transfer switch which alternatively connects a load to a normal source of power or starts up an emergency source of power and connects the load to it. The control panel includes monitors for the normal and emergency sources, the monitors having a pickup voltage and a lower dropout voltage, relays for initiating operation of the emergency or normal sources when the normal source drops below the dropout level or the emergency source rises above the pickup voltage or frequency level, and time delay circuits between the monitors and the relays preventing operation of the relays unless the voltage levels exist beyond the time periods provided.
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