Siemens SENTRON 3VL - Page 122

Displays and operator controls
9.1 Overcurrent trip unit without LCD display
3VL molded-case circuit breakers
122 System Manual, 03/2009, 110 0110 - 02 DS 01
Thermomagnetic overcurrent trip units TM VL160-VL630
Characteristic
curve
Application View
/
,
Line protection TM, LI/LIN function
Overload protection adjustable I
R
= 0.8 to 1 x
I
n
Short-circuit protection adjustable I
i
= 5 to
10 x I
n
for VL160 to VL630
2
5
6
7
n
x
10
9
8
i
46
TM
50 C
CAT.A
=160A
n
x
n
.8
DC
R
1.0
16
•
••
~
=
NSE-00541
•
•
iR
•
•
Electronic trip units ETU VL160-VL1600
The electronic trip units include the following operating features:
● No auxiliary voltage is necessary for the tripping system.
● All ETUs have a thermal memory
● A flashing green LED indicates correct operation of the microprocessor
● Overload status (I > 1.05 x I
R
) is indicated by a permanently lit yellow LED (alarm)
● Integral self-test function
● Plug-in socket for tester
● Communication link to PROFIBUS DP and Modbus
Characteristic
curve
Application View
/
,
ETU10 for line protection, LI/LIN function
Overload protection I
R
= 0.4; 0.45; 0.5 to
0.95; 1 x I
n
, time-lag class t
R
= 2.5 to 30
Short-circuit protection (instantaneous)
I
i
= 1.25 to 11 x I
n
(frame-size-dependent)
Neutral conductor protection
I
n
= 50%/100% x I
R
, "TA" and "NA" versions
.5
.8
.7
.63
.9
.6
.45
.4
.95
2.5
1.25
1.5
1.0
Alarm
Active
>1.05
X3
x
I
n
R
I
17
14
20
(S)
R
t
30
25
10
8
6
4
6
8
x
I
n
5
4
3
2
10
i
II
I
I
11
N
N
50%
N
100%
/
6
,
ETU20 for line and generator protection,
LSI / LSIN function
Overload protection I
R
= 0.4; 0.45; 0.5 to
0.95; 1 x I
n
Short-circuit protection (short-time delay)
I
sd
= 1.5 to 10 x I
R
, t
sd
= 0 to 0.5 s
I
2
t selectable on/off
Short-circuit protection (instantaneous)
I
i
= 11 x I
n
(fixed setting, frame-size-
dependent)
Neutral conductor protection
I
n
= 50%/100% x I
R
, "TF" and "NF" versions
.5
.8
.7
.63
.9
.6
.45
.4
.95
1.5
2.5
.4
.5
.2
.3
.4
.3
.2
.1
.1
1.0
Alarm
Active
>1.05
X3
x
I
n
R
I
6
5
7
sd
t
10
8
4
3
2
x
I
R
sd
II
I
I
N
N
50%
N
100%
(S)
t
I
I
ON
2
t
2
OFF
0