LV Breaker Series Coordination Tick Mark

As per manufacturer’s publications, low voltage breakers in series can be selectively coordinated in the instantaneous trip region up to a certain short circuit level although the TCC plot may indicate otherwise. If two breakers plotted on the TCC have series coordination data specified in the library, then a tick mark appears to indicate the maximum short circuit current up to which coordination is possible. If a breaker style is changed in a TCC plot, the TCC needs to be plotted again to get the new series coordination tick mark.

Figure 1: Series Coordination Tick Mark

More Information