Siemens SENTRON 3WL10 - Page 70

Protection functions of the ETU ETU650 LSI ETU660 LSIG
S ST: Short-time-delayed short-circuit protection
Protection function can be enabled/disabled ● ●
Setting range of operating value I
sd
= I
n
x … 0.6 to 10 (in steps of 0.1)
Default value: OFF
Tolerance
1)
:
± 7% I ≤ 6 x I
n
± 10% I ≤ 6 x I
n
0.6 to 10 (in steps of 0.1)
Default value: OFF
Tolerance
1)
:
± 7% I ≤ 6 x I
n
± 10% I ≤ 6 x I
n
Short-circuit protection characteristic Switchable
I²t / t = constant
Switchable
I²t / t = constant
Setting range for delay time t
sd
(󹪝xed delay) t=k 0.05 to 0.4 s (in steps of 0.01)
Default value: 0.05
Tolerance
1)
: The better value
out of ± 10% or ±40ms
0.05 to 0.4 s (in steps of 0.01)
Default value: 0.05
Tolerance
1)
: The better value
out of ± 10% or ±40ms
Setting range for delay time t
sd
at I²t (reference
point 10 x I
n
)
0.05 to 0.5 s (inverse-time in
relation to I²t) (in steps of
0.01)
0.05 to 0.5 s (inverse-time in
relation to I²t) (in steps of
0.01)
Tripping can be deactivated ● ●
Switchover to alternative operating values with
short-time-delayed short-circuit current during
the switch-on phase (inrush adaptation) for trip‐
ping characteristic t=k (󹪝xed) possible
●
Default value: OFF
●
Default value: OFF
Setting range of the switch-on phase (inrush
adaptation)
0.1 to 30 s (in steps of 0.01)
Default value: 0.1
0.1 to 30 s (in steps of 0.01)
Default value: 0.1
Setting range Isd = In x … during the switch-on
phase (inrush adaptation)
0.6 to 10 (in steps of 0.1)
Default value: 10
0.6 to 10
(in steps of 0.1)
Default value: 10
I INST: Instantaneous short-circuit protection I
i
Protection function can be enabled/disabled ● ●
Setting range for operating value I
i
= I
n
x … 1.5 to 15 (in steps of 0.1)
Default value: 2
Tolerance
1)
: ± 10%
1.5 to 15 (in steps of 0.1)
Default value: 2
Tolerance
1)
: ± 10%
Switchover to alternative operating values with
instantaneous short-circuit current during the
switch-on phase (inrush adaptation) for tripping
characteristic t=k (󹪝xed) possible
●
Default value: OFF
●
Default value: OFF
Setting range of the switch-on phase (inrush
adaptation)
0.10 to 30 s (in steps of 0.01)
Default value: 0.1
Tolerance
1)
: ≤ 30 ms
0.10 to 30 s (in steps of 0.01)
Default value: 0.1
Tolerance
1)
: ≤ 30 ms
Setting range I
i
= I
n
x … during the switch-on
phase (inrush adaptation)
1.5 to 15 (in steps of 0.1)
Default value: 1.5
1.5 to 15 (in steps of 0.1)
Default value: 1.5
N Neutral protection
Neutral protection can be enabled/disabled ● ●
Current setting value I
N
= I
n
x … 50%; 100%; 150%; 200% 50%; 100%; 150%; 200%
Description
2.9Electronic trip unit ETU
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Equipment Manual, 10/2023, L1V30499596002-03 69