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Instantaneous short-circuit protection INST
INST
• Setting option phase unbalance I
Phase unbalance
I
nba
• Setting the trip class T
The trip class T
state, with 7.2 times the set current I
The trip classes with "E" stand for a narrower tolerance band of the tripping time T
trip classes can also be implemented with the precise electronic trip units of the 3VA27 /
3WL10 motor starter protectors.
The trip class T
of the delay time t
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Equipment Manual, 10/2023, L1V30499596002-03
Switchover to alternative operating values
with instantaneous short-circuit current
during the switch-on phase (inrush adap‐
tation, startup function)
Setting range for duration t during the
switch-on phase
Setting range I
= I
x ... during the switch-
i
n
on phase
Protection function can be enabled/disa‐
bled
Setting range I
nba
Phase current unbalance
Setting range of the delay time t
for phase current unbalance
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.
or the tripping time T
c
specifies the tripping time T
c
itself cannot be set directly on the ETU. This can be calculated by conversion
c
for the I
2
t characteristic to the tripping time T
r
Delay time
Corresponds to
to be set t
tripping time T
r
11.5 s
24.5 s
36 s
ETU650 LSI
nba
ETU650 LSI
nba
p
for balanced 3-pole loads, starting from the cold
p
according to IEC EN 60947 4-1.
r
CLASS T
p
8 s
17 s
25 s
2.7 Possible uses and portfolio
ETU660 LSIG
●
Default value: OFF
Switch over to ON
0.10 to 30 s (in steps of 0.01)
Default value: 0.1
1.5 to 15 (in steps of 0.1)
Default value: 1.5
ETU660 LSIG
●
Default value: OFF
Switch over to ON
2 to 90% (in steps of 1%)
Default value: 50%
0.50 to 60 s (in steps of 0.5)
Default value: 10 s
●
Default value: OFF
Switch over to ON
.
p
Range
c
10A
2 s < T
10
4 s < T
10E
5 s < T
20
6 s < T
20E
10 s < T
30
9 s < T
30E
20 s < T
Description
. These
p
< 10 s
p
< 10 s
p
< 10 s
p
< 20 s
p
< 20 s
p
< 30 s
p
< 30 s
p
29
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