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3VT4 Molded Case Circuit Breakers up to 1000 A
Overcurrent releases
5/11
Siemens LV 36 · 2008
5
Overcurrent releases ETU DP-Distribution
Protecting lines and transformers
The 3VT9 4..-6AC00 release is intended only for the 3VT4 710-
3AA..-0AA0 switching unit. Operation of the release is controlled
by a microprocessor. The release is fitted with a thermal memory
that can be disabled by turning the switch on the front panel from
position T
(t)
to position T
(0)
. After having disabled the thermal
memory, the thermal release remains active.
A practical advantage of the release are special
tripping characteristics that provide for optimized use of trans-
formers up to 1.5
I
n
.
Another advantage of this release is the simple adjustment of the
tripping characteristics. Set-up includes only the rated current in
a range of 0.4 to 1.0 of
I
n
and the short-circuit tripping level. The
reaching of 80% and 110% of
I
r
is indicated by LED diodes on
the front panel denoted as
I
> 80% and
I
> 110% of
I
r
.
On the lower part of the release cover are four photocells for
communicating with the 3VT9 500-6AE00 signalling unit are
mounted.
Tripping characteristics
Specifications for adjustable releases
0.02
0.02
0.02
0.05
0.05
0.05
0.01
0.01
0.01
NSO0_00377
L
I
20
200
2000
50
500
5000
10
100
1000
10000
t
[s]
0.01
0.02
0.05
0.1
0.1
0.1
0.1
0.2
0.5
1
2
5
I
n=630A
I
n=1000A
I
n=1250A
I
n=1600A
15 A
63
n
80
1 0 A
I
n
= 315 A
I
n
= 630 A
I
n
= 800 A
I
n
= 1000 A
x
I
n
1 2
5
20
50
10
0.1 0.2 0.5
I
r
I
i
I
i
[kA]
I
i
[kA]
I
i
[kA]
I
i
[kA]
3
3
10 8.0 6.0
4.0 3.
0
2.0 1.5
0.8
1214 9.0
5.0 7.0
3.0
2.0
1.25
12 9.0
6.0
4.0 3.0
2.0 1.5
1.0
0.5
5.0 4.0 3.0 2.5 2.0 1.5
1.0
I
r
min.
max.
Order No.
Rated cur-
rent
I
n
Overload
protection
I
r
Restart Instantaneous
short circuit pro-
tection
I
A
A
125, 137
0.5
144, 160
1
172, 180
1.5
200, 220 T
(0)
2
3VT9 431-6AC00 315
231, 243 T
(t)
2.5
250, 260
3
275, 290
4
305, 315
5
250, 260
0.8
275, 290
1.5
305, 315
2
345, 360 T
(0)
3
3VT9 463-6AC00 630
400, 435 T
(t)
4
455, 480
6
500, 550
8
575, 630
10
315, 345
1
360, 400
1.5
435, 455
2
480, 500 T
(0)
3
3VT9 480-6AC00 800
550, 575 T
(0)
4
610, 630
6
685, 720
9
760, 800
12
400, 435
1.25
455, 480
2
500, 550
3
575, 610 T
(0)
5
3VT9 410-6AC00 1000
630, 685 T
(0)
7
720, 760
9
800, 866
12
909, 1000
14