Siemens SENTRON 3WL10 - Page 69

Protection functions of the ETU ETU320 LI ETU350 LSI ETU360 LSIG
Func‐
tions
Frequency adaptation
Setting of the line frequency on ETUs of
the 3-series with DIP switches
50 Hz; 60 Hz
Default value: 50 Hz
50 Hz; 60 Hz
Default value: 50 Hz
50 Hz; 60 Hz
Default value: 50 Hz
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%
Electronic trip units of the 6-series
Protection functions of the ETU ETU650 LSI ETU660 LSIG
L LT: Overload protection
Protection function can be enabled/disabled Via rating plug "L=o󹪜" Via rating plug "L=o󹪜"
Setting range of operating value I
r
= I
n
x … 0.4 to 1 (in steps of 0.001)
Default value: 1
Tolerance
1)
: Tripping between
1.05 and 1.2 x I
r
0.4 to 1 (in steps of 0.001)
Default value: 1
Tolerance
1)
: Tripping between
1.05 and 1.2 x I
r
Setting range for delay time t
r
at I²t
(reference point 6 x I
n
)
0.75 to 36 s (in steps of 0.25)
Default value: 36 s
Tolerance
1)
:
± 10% I ≤ 6 x I
n
± 20% I > 6 x I
n
0.75 to 36 s (in steps of 0.25)
Default value: 36 s
Tolerance
1)
:
± 10% I ≤ 6 x I
n
± 20% I > 6 x I
n
Switchable overload protection characteristic
IEC60255-151
t
trip
=(t
r
∙b)/((I
load
/I
r
)^
α
-1)
I
4
t: α=4, b=1296
standard inverse SI: α=0.02,
b=0.0364
very inverse VI: α=1, b=5 ex‐
tremely inverse EI: α=2,
b=35.2
Default value: I²t
I
4
t: α=4, b=1296
standard inverse SI: α=0.02,
b=0.0364
very inverse VI: α=1, b=5 ex‐
tremely inverse EI: α=2,
b=35.2
Default value: I²t
Setting range for delay time t
r
for characteristic
IEC60255‑151
(reference point 6 x I
n
)
0.75 to 5 s (in steps of 0.25)
Default value: 5 s
Tolerance
1)
:
± 10% I ≤ 6 x I
n
± 20% I > 6 x I
n
0.75 to 5 s (in steps of 0.25)
Default value: 5 s
Tolerance
1)
:
± 10% I ≤ 6 x I
n
± 20% I > 6 x I
n
Thermal memory can be enabled/disabled ● ●
Overload pre-alarm 50 to 100% x I
r
(in steps of 1%)
Default value: 90%;
50 to 100% x I
r
(in steps of 1%)
Default value: 90%;
Description
2.9Electronic trip unit ETU
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
68 Equipment Manual, 10/2023, L1V30499596002-03