Protection functions of the ETU ETU650 LSI ETU660 LSIG
I-NBA Phase current unbalance I-NBA
Protection function can be enabled/disabled ● ●
Setting range I
nba
phase current unbalance 2 to 90% (in steps of 1%)
Default value: 50%
2 to 90% (in steps of 1%)
Default value: 50%
Setting range of the delay time t
nba
for phase cur‐
rent unbalance
0.50 to 60 s (in steps of 0.5)
Default value: 10 s
0.50 to 60 s (in steps of 0.5)
Default value: 10 s
Enabling/disabling of tripping on phase current
unbalance
● ●
1)
ETU powered in at least 2 phases or self-powered with auxiliary voltage. In all other cases,
the following tolerances apply:
Current setting value Tripping time
L Tripping between 1.05 and 1.2 x I
r
± 20%
S ± 10% ± 20%
I ± 15% ≤ 60 ms
G ± 15% ± 20%
Other protection functions ± 15% ± 20%
Description
2.9Electronic trip unit ETU
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
72 Equipment Manual, 10/2023, L1V30499596002-03
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