Circuit Breaker Operating Characteristic - current carrying capacity of the circuit cable type of circuit breaker required b c or d depending on the load characteristics frame size of the circuit breaker ambient temperature at the point of installation prospective fault current at the point of installation the need for backup protection a typical circuit breaker operating characteristic curve is shown in the graph below here in the graph x axis represents time in milli seconds and y axis represents distance in milli meter let s at time t 0 current starts flowing through the closing coil a circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload or short circuit its basic function is to interrupt current flow after a fault is detected 2 characteristics of circuit breakers 2 1 rated operating voltage u e in v this is the voltage s at.

which the circuit breaker can be used the value indicated is usually the maximum value at lower voltages certain characteristics may differ or even be improved such as the breaking capacity fig 11 typical tripping characteristics for thermomag ic circuit breakers a operating range for thermal tripping b operating range for mag ic tripping t switching time in seconds xi multiple of the nominal current tripping factor 1 current range for which the characteristic curve applies 2 dc tripping range gray 3 ac tripping range blue 4 tripping maximum 5 tripping minimum in the





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