Siemens SENTRON 3WL10 - Page 68

Protection functions of the ETU ETU320 LI ETU350 LSI ETU360 LSIG
S ST: Short-time-delayed short-circuit protection
Protection function can be enabled/disa‐
bled
— ● ●
Setting range of operating value I
sd
= I
n
x
…
— 1; 1.5; 2; 2.5; 3; 4; 6; 8;
10
Default value: OFF
Tolerance
1)
:
± 7% I ≤ 6 x I
n
± 10% I ≤ 6 x I
n
1; 1.5; 2; 2.5; 3; 4; 6; 8;
10
Default value: OFF
Tolerance
1)
:
± 7% I ≤ 6 x I
n
± 10% I ≤ 6 x I
n
Characteristic (switchover possible) — I²t / t = constant I²t / t = constant
Setting range for delay time t
sd
(󹪝xed de‐
lay) t=k
— 0.08; 0.15; 0.22; 0.3;
0.4
Tolerance
1)
: The better
value out of ± 10% or
±40ms
0.08; 0.15; 0.22; 0.3;
0.4
Tolerance
1)
: The better
value out of ± 10% or
±40ms
Setting range for delay time t
sd
at I²t (ref‐
erence point 10 x I
n
)
— 0.1; 0.2; 0.3; 0.4; 0.5
Default value: 0.1
0.1; 0.2; 0.3; 0.4; 0.5
Default value: 0.1
I INST: Instantaneous short-circuit protection
Protection function can be enabled/disa‐
bled
● ● ●
Setting range for operating value I
i
= I
n
x
…
1.5; 2; 3; 4; 6; 8; 10; 12;
15
Default value: 1.5
Tolerance
1)
: ± 10%
1.5; 2; 3; 4; 6; 8; 10; 12;
15
Default value: 1.5
Tolerance
1)
: ± 10%
1.5; 2; 3; 4; 6; 8; 10; 12;
15
Default value: 1.5
Tolerance
1)
: ± 10%
N Neutral protection
Neutral protection can be enabled/disa‐
bled
● ● ●
Current setting value I
N
= I
n
x … 0.5; 1; 2
Default value: 0.5
0.5; 1; 2
Default value: 0.5
0.5; 1; 2
Default value: 0.5
G GF: Ground-fault protection
Protection function can be enabled/disa‐
bled
— — ●
Characteristic (switchover possible) — — I²t / t = constant
Default value: I²t
Setting range for operating value I
g
= I
n
x
…
(The range <0.2I
n
or <0.25I
n
(for
I
n
= 400 A) requires an external auxiliary
power supply of the ETU)
— — 0.1; 0.2; 0.3; 0.4; 0.5;
0.6; 0.7; 0.8; 1
Default value: 0.1
Tolerance
1)
: ± 7%
Setting range for delay time t
g
(󹪝xed) t=k — — 0.1; 0.2; 0.4; 0.6; 0.8s
Tolerance
1)
: The better
value out of ± 10% or
±40 ms or 50 ms with
t
g
=instantaneous
Setting range for delay time t
g
at I²t (ref‐
erence point 2 x I
g
)
— — 0.1; 0.2; 0.4; 0.6; 0.8s
Default value: 0.1 (I²t)
Description
2.9Electronic trip unit ETU
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Equipment Manual, 10/2023, L1V30499596002-03 67