Siemens SENTRON 3WL10 - Page 30

Instantaneous short-circuit protection INST ETU650 LSI ETU660 LSIG
INST Switchover to alternative operating values
with instantaneous short-circuit current
during the switch-on phase (inrush adap‐
tation, startup function)
●
Default value: OFF
Switch over to ON
Setting range for duration t during the
switch-on phase
0.10 to 30s (in steps of 0.01)
Default value: 0.1
Setting range I
i
= I
n
x … during the switch-
on phase
1.5 to 15 (in steps of 0.1)
Default value: 1.5
• Setting option phase unbalance I
nba
Phase unbalance ETU650 LSI ETU660 LSIG
I
nba
Protection function can be enabled/disa‐
bled
●
Default value: OFF
Switch over to ON
Setting range I
nba
Phase current unbalance
2 to 90% (in steps of 1%)
Default value: 50%
Setting range of the delay time t
nba
for phase current unbalance
0.50 to 60s (in steps of 0.5)
Default value: 10s
Enabling/disabling of tripping on phase
current unbalance
On "OFF", a message is output on the dis‐
play or via the communication interface,
but no tripping.
●
Default value: OFF
Switch over to ON
• Setting the trip class T
c
or the tripping time T
p
The trip class T
c
speci󹪝es the tripping time T
p
for balanced 3-pole loads, starting from the cold
state, with 7.2 times the set current I
r
according to IECEN609474-1.
The trip classes with "E" stand for a narrower tolerance band of the tripping time T
p
. These
trip classes can also be implemented with the precise electronic trip units of the3VA27 /
3WL10 motor starter protectors.
The trip class T
c
itself cannot be set directly on the ETU. This can be calculated by conversion
of the delay time t
r
for the I
2
t characteristic to the tripping time T
p
.

Delay time
to be set t
r

Corresponds to
tripping time T
p

CLASS T
c

Range
11.5s 8s 10A 2 s < T
p
< 10 s
10 4 s < T
p
< 10 s
10E 5 s < T
p
< 10 s
24.5s 17s 20 6 s < T
p
< 20 s
20E 10 s < T
p
< 20 s
36s 25s 30 9 s < T
p
< 30 s
30E 20 s < T
p
< 30 s
Description
2.7Possible uses and portfolio
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Equipment Manual, 10/2023, L1V30499596002-03 29