Siemens 3VA1 100 A Manual page 122

Applications
3.1 Line protection applications of 3VA molded case circuit breakers
Overload protection L:
•
•
The ETU560 LSIG and ETU860 LSIG units have a thermal image which can be deactivated.
Short-time delayed short circuit protection S:
•
•
The curve shape I
Instantaneous short-circuit protection I:
•
Ground-fault protection G:
4-pole breakers or 3-pole breakers with external current transformer for N conductor detect
ground fault currents by calculating the vector sum of the phase currents and the neutral
conductor current.
•
•
An alarm threshold I
The current-dependent curve shape I
The ground-fault protection function G can be deactivated.
122
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 from 0.2 / 0.25 / 0.4 / 0.6 to 1.0 x I
g
In steps of 1 A
t adjustable from 0.05 to 0.8 s
g
with a reference point of 2 x I
In steps of 0.01 s
between 0.2 to 1 x I
gA
in absolute current values
n
.
r
n
= 8 x I
sd r
n
n
g
can also be set. In steps of 1 A
n
t = constant can be deactivated.
2
3VA molded case circuit breakers
Manual, 04/2015, A5E03603177010-02