Siemens 3VA1 100 A Manual page 119

Overload protection L:
•
•
The ETU550 LSI and ETU850 LSI units have a thermal image.
Short-time delayed short circuit protection S:
•
•
The curve shape I
Instantaneous short-circuit protection I:
•
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.
•
3VA molded case circuit breakers
Manual, 04/2015, A5E03603177010-02
3.1 Line protection applications of 3VA molded case circuit breakers
I adjustable from 0.4 to 1.0 x I
r
I < 50 A: In steps of 0.5 A
r
I ≥ 50 A: In steps of 1 A
r
t adjustable from 0.5 to 12 / 15 / 17 / 20 / 25 s (depending on rated operational
r
current and breaker size)
with a reference point of 6 x I
In steps of 0.1 s
I adjustable from 0.6 to 9 / 10 x I
sd
I < 50 A: In steps of 0.5 A
sd
I ≥ 50 A: In steps of 1 A
sd
t adjustable from 0.05 to 0.5 s
sd
with a reference point of I
in steps of 0.01 s
t = constant can be deactivated.
2
I Breaker sizes 100 A to 400 A:
i
adjustable from 1.5 to 10 / 12 x I
Size 630 A:
see tables above
In steps of 1 A
I adjustable in steps of 1 A
N
3-pole breakers with external current transformer for N conductor:
I < 63 A: 0.4 to 1.6 x I
n
I ≥ 63 A: 0.2 to 1.6 x I
n
4-pole breakers:
I < 63 A: 0.4 to 1.6 x I
n
I ≥ 63 A: 0.2 to 1.0 or 1.6 x I
n
in absolute current values
n
.
r
n
= 8 x I
sd r
n
n
n
n
n
Applications
119