Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
February 17, 2009
Patent Application Number
11241095
Date Filed
September 30, 2005
Patent Primary Examiner
Patent abstract
The trip unit of a circuit breaker provides overload protection for a contactor used to energize a load such as a motor while still providing conventional protection for the wiring serving the motor. The trip unit of the circuit breaker eliminates the need for a separate overload relay by generating a pre-trip signal that opens the contactor when the circuit breaker I2t long delay function reaches a selected percentage, such as about 85%, of the trip value.
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