Operation of residual current devices
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 14, 1999
Grant Date -
N/A
app pub date -
Mar 14, 1997
filing date -
Jul 4, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A push button residual current device employs a single push button to perform setting and testing operations. Over a first part of the down stroke of the push button a test trip is initiated which causes the device to trip if it is properly functioning. When the push button is pushed further, and then released, the device goes into a state allowing current to pass provided no trip condition is detected. Once the device is operative for allowing current to pass, any fault condition results in a trip for disconnecting the power supply.
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