Circuit breaker having separate restrained and unrestrained zone selective interlock setting capability
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United States of America Patent
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Sep 6, 2011
Grant Date -
Oct 15, 2009
app pub date -
Apr 15, 2008
filing date -
Apr 15, 2008
priority date (Note) -
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Abstract
A circuit breaker system and method having zone selective interlock features with separate restrained and unrestrained setting capability is provided. The system and method include the transmission of a selective interlock signal from a downstream circuit breaker to an upstream circuit breaker in the event of a fault condition. The upstream circuit breaker upon receipt of this signal changes the tripping response of the second circuit breaker to a restrained mode. The circuit breakers include features enabling the user to modify and adjust both the restrained and unrestrained trip curves associated with both the restrained and unrestrained modes of operation.
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