Siemens Sentron 3VA - Page 125

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
123
ETU550 / ETU850 parameters (3-pole version):
1)
only 3-pole version with external current transformer for N conductor
ETU550 / ETU850 parameters (4-pole version):
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):
in steps of 0.1 s
with a reference point of 6 x I
r
The ETU550 LSI and ETU850 LSI have a permanently active thermal memory.