Applications
3.2 Line protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
138
Manual, 03/2019, A5E03603177010-03
Neutral conductor protection N:
The neutral conductor protection function is available only for 3-pole molded case circuit
breakers with external current transformer for N conductor for 4-pole molded case circuit
breakers.
•
I
N
Adjustable in steps of 1 A
3-pole breakers with external current transformer for N conductor:
I
n
< 63 A: 0.4 to 1.6 x I
n
I
n
≥ 63
A: 0.2 to 1.6 I
n
4-pole breakers:
I
n
< 63 A: 0.4 to 1.6 x I
n
I
n
≥ 63
A: 0.2 to 1.0 or 1.6 x I
n
