Selectivity for 3VA molded case circuit breakers
Configuration Manual, 08/2016, A5E03603181010-01
13
Methods of implementing selectivity using circuit
breakers
3
Using the example of a fault scenario in a power distribution system, this chapter explores
the potential methods for implementing selectivity. The description in this chapter focuses on
the implementation of selectivity between circuit breakers. The subject of implementing a
selectivity concept using combinations of different protective devices is discussed in chapter
"Selectivity implemented by combinations
of protective devices (Page 47)".
Definition of selectivity
The followi
ng different methods can be used to implement selectivity with low-voltage circuit
breakers:
● Selectivity in the overload zone
● Selectivity in the short-circuit zone
– Current selectivity
– Time selectivity
– Dynamic selectivity (energy selectivity)
– Zone selective interlocking (ZSI, zone selectivity, logical selectivity)
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