Siemens SENTRON 3WL10 - Parameters of the Trip Units

These modules allow determination of the following additional measured quantities:
• Voltage
• Power
• Energy
Additional features of the MF Advanced version:
• Implementation of the enhanced protection functions that are based on the variables
voltage and power
• Power supply of the ETU from the busbar voltage (for line voltages above 80V, phase-to-
phase) and therefore also activation of further functions such as powering the external
ground-fault neutral transformer G
ret
, or the making current release, without an external
power source, and, for example, measurement and activation of the overvoltage protection,
without and before connection of the contacts. (In this case, the voltage must be picked o󹪜
on the incoming side so that the ETU can be powered)
• Implementation of the Rc residual current protection function via an external summation
current transformer
2.9.5 Parameters of the trip units
The parameter values of the trip units that can be set are listed below.
Electronic trip units of the 3-series
Protection functions of the ETU ETU320 LI ETU350 LSI ETU360 LSIG
L LT: Overload protection
Setting range of operating value I
r
= I
n
x … 0.4; 0.5: 0.6; 0.7; 0.75;
0.8; 0.85; 0.9; 0.95; 1
Default value: 0.4
Tolerance
1)
: Tripping
between 1.05 and
1.2xI
r
0.4; 0.5: 0.6; 0.7; 0.75;
0.8; 0.85; 0.9; 0.95; 1
Default value: 0.4
Tolerance
1)
: Tripping
between 1.05 and
1.2xI
r
0.4; 0.5: 0.6; 0.7; 0.75;
0.8; 0.85; 0.9; 0.95; 1
Default value: 0.4
Tolerance
1)
: Tripping
between 1.05 and
1.2xI
r
Setting range for delay timet
r
at I²t (ref‐
erence point 6 x I
r
)
0.75; 1; 2; 5; 8; 10; 14;
17; 21; 25 s
Default value: 0.75 s
Tolerance
1)
:
± 10% I ≤ 6 x I
n
± 20% I > 6 x I
n
0.75; 1; 2; 5; 8; 10; 14;
17; 21; 25 s
Default value: 0.75 s
Tolerance
1)
:
± 10% I ≤ 6 x I
n
± 20% I > 6 x I
n
0.75; 1; 2; 5; 8; 10; 14;
17; 21; 25 s
Default value: 0.75 s
Tolerance
1)
:
± 10% I ≤ 6 x I
n
± 20% I > 6 x I
n
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%
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
66 Equipment Manual, 10/2023, L1V30499596002-03