Siemens SENTRON 3VL - Page 123

Displays and operator controls
9.1 Overcurrent trip unit without LCD display
3VL molded-case circuit breakers
System Manual, 03/2009, 110 0110 - 02 DS 01
123
Characteristic
curve
Application View
/
*
,
ETU12 for line protection,
LIG/LING 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)
On 4-pole circuit breakers:
neutral conductor protection 50%/100% × I
R
Ground fault protection:
I
g
= 0.6/1.0 I
n
, t
g
= 0.1/0.3 s
measuring method No. 1: (G
R
) vectorial
summation current formation in the three
phases and neutral conductor (4-conductor
systems); I
Δn
= I
n
, versions "SL", "SF", "ML",
"MF", "TN", "NN"
.5
.8
.7
.63
.9
.6
.45
.4
.95
2.5
1.25
1.5
.6/.1
1/.1
.6/.1
1/.1
.6/.3
1/.3
.6/.3
1/.3
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
I
11
I
N
I
g
t
g
I
N
OFF
OFF
I
100% 50%
/
6
,
*
ETU22 for line and generator protection,
LSIG/LSING 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)
On 4-pole circuit breakers:
neutral conductor protection 50%/100% × I
R
Ground fault protection:
I
g
= 0.6/1.0 I
n
, t
g
= 0.1/0.3 s
Measuring method No. 1: (G
R
) vectorial
summation current formation in the three
phases and neutral conductor (4-conductor
systems);
I
Δn
= I
n
, versions "SG", "MG", "SH", "MH",
"TH", "NH"
.5
.8
.7
.63
.9
.6
.45
.4
.95
1.5
2.5
.4
.5
.2
.3
.4
.3
.2
.1
.1
.6/.1
1/.1
.6/.1
1/.1
.6/.3
1/.3
.6/.3
1/.3
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
I
(S)
t
I
I
ON
2
t
2
OFF
0
I
N
I
g
t
g
I
N
OFF
OFF
I
100% 50%