Water sensing type power breaker circuit
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United States of America Patent
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Aug 25, 1992
Grant Date -
N/A
app pub date -
Aug 23, 1990
filing date -
Sep 5, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A water sensing type power breaker circuit is incorporated into an electric appliance such as a hair dryer or the like and is used to cut off a power supply to prevent an accident due to an electric shock immediately when the electric appliance is dropped into the water. A water sensing type power breaker circuit includes first and second contacts having one polarity connected to a power supply and the other polarity connected to a load, an impedance element circuit including first and second impedance elements connected in series each other and which is connected in parallel with the load, a water sensing element made of an electrical conductor connected to an intermediate point between both the impedance elements through a conductor, and a relay for detecting a current flowing through the conductor to open the first and second contacts when the current flows through the conductor. The relay is held by itself so that the first and second contacts are opened. The water sensing type power breaker circuit is inexpensive and has a small occupancy volume so that it can be directly incorporated into the electric appliance such as a dryer.
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