Selective-Interruption - Mitsubishi NF-S Series Technical Notes

6.3 Selective-Interruption (Discrimination)
6.3.1 Selective-Interruption Combination
Following tables show combinations of main-circuit
selective coordination breakers and branch breakers
and the available selective tripping current at the set-
ting points at the branch-circuits.
Selection Conditions
1. The main breaker rated current, STD operating time
and INST pickup current are to be set to the maxi-
mum values.
2. When selecting the over-current range, also check
the conformity using the other characteristic curves.
Selective interruption combinations (MCB-MCCB)
230VAC (Sym. kA)
Main Breaker
Note 1
Branch
Breaker
BH-D6
TYPE B
BH-D6
TYPE C
Icu : Rated breaking capacity
Note1 : Reted currents of main breakers are maximum values.
Note2 : Reted currents of branch breakers are 50A or less.
NF100-SEP
Icu(kA) 50
6 1.6 Note2 1.6 Note2
6 1.6 Note2
Main breaker
Continuous supply
Healthy circuit
Main breaker
STD pick up current.
Set up STD operating time in the
Branch
maximum value.
breaker
NF250-SEP
50
3.5
3.5
Branch breaker
Short-circuit point
Set up inst pick up current
in the maximum value.
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