Transcription of Selective Coordination - Cooper Industries
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Selective Coordination - Cooper Industries
94 2005 Cooper BussmannCircuit Breaker CurvesThe following curve illustrates a typical thermal magnetic molded case circuitbreaker curve with an overload region and an instantaneous trip region (twoinstantaneous trip settings are shown). circuit breaker time-current characteristic curves are read similar to fuse curves. The horizontal axis represents the current, and the vertical axis represents the time at which thebreaker interrupts the using molded case circuit breakers of this type, there are four basiccurve considerations that must be understood. These are:1. Overload Region2. Instantaneous Region3. Unlatching Time4. Interrupting Rating1. Overload Region:The opening of a molded case circuit breaker in theoverload region is generally accomplished by a thermal element, while a magnetic coil is generally used on power breakers.
©2005 Cooper Bussmann 95 Medium to High Level Fault Currents–Circuit Breakers The following curve illustrates a 400A circuit breaker ahead of a 90A breaker.
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