Siemens Sentron 3VA - Page 121

Applications
3.1 Use of the 3VA UL molded case circuit breakers in line protection
3VA molded case circuit breakers with UL and IEC certification
Manual, 01/2019, L1V30435333-01
119
ETU820 parameters, 4-pole
Overload protection L:
•
I
r
Adjustable from 0.4 to 1.0 x I
n
in absolute current values
I
r
= 40 A: In steps of 0.5 A
I
r
≥ 100 A: In steps of 1 A
•
t
ld
Adjustable from 0.5 to 13 / 15 / 17 / 20 / 25 s (dependent on rated operational
current and frame size)
with a reference point of 6 x I
r
.
In steps of 0.1 s
The ETU820 LI has a permanently active thermal memory.
Instantaneous short-circuit protection I:
•
I
i
Adjustable from 1.5 to 9 / 10 / 11 / 12 x I
n
(dependent on the frame size):
In steps of 1 A
Neutral conductor protection N:
Protection of the neutral conductor is available only for 4-pole molded case circuit breakers.
•
I
N
I
n
= 40 A: 0.4 to 1.6 x I
n
I
n
≥ 100 A: 0.2 to 1.0 or 1.5 / 1.6 x I
n