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3VT4 Molded Case Circuit Breakers up to 1000 A
Overcurrent releases
5/12
Siemens LV 36 · 2008
5
Overcurrent releases ETU MP-Motors
• Direct protection of motors and generators
• Possibility for protecting lines and transformers
The 3VT9 4..-6AP00 release is intended only for the 3VT4 710-
3AA..-0AA0 switching unit. The operation of the release is con-
trolled by a microprocessor. The release is equipped with a
thermal memory that can be disabled by turning a switch on the
front panel from position T
(t)
to position T
(0)
. After having dis-
abled the thermal memory, the thermal release remains active.
A practical advantage of the release are specially designed
tripping characteristics that provide for optimal exploitation of
transformers up to 1.5
I
n
. It is possible to set a total of 8 charac-
teristics on the release. From these, in mode “M” there are 4
characteristics for motor protection and another 4 characteris-
tics in mode “T
V
” for protecting transformers and lines. The
shape of each characteristic can be changed using a selector
switch.
When one or two phases fail, in the M-characteristic mode, the
switch will open with a 4 s delay (so called undercurrent
release).
Another parameter for adjusting the release is the rated current,
which is adjusted in a range of 0.4 to 1.0 of
I
n
and the short-
circuit tripping level, for which it is possible to set the delay at 0
or 50 ms. The reaching of 80% and 110% of
I
r
is indicated by
LED diodes on the front panel denoted as
I
> 80% of
I
r
and
I
>
110% of
I
r
. On the lower part of the release cover four photocells
are mounted for communicating with the 3VT9 500-6AE00 sig-
nalling unit.
Specifications for adjustable releases
Order No.
Rate
d
cur-
rent
In
Overload
protec-
tion
I
r
t
r
(7.2 x
I
r
) Restar
t
Instantaneous
short circuit pro-
tection
I
A A
S
kA
ms
0.5
125, 137 1 (TV 1)
1
1.5
144, 160 3 (TV 3)
T
(0)
2
0
2.5
172, 180 10 (TV 10)
3
4
3VT9 431-6AP00
315 200, 220 30 (TV 30)
5
5
231, 243 3 (TV 3)
4
3
250, 260 8 (TV 8)
T
(t)
2.5
50
2
275, 290 15 (TV 15)
1.5
1
305, 315 25 (TV 25)
0.5
0.8
250, 260 1 (TV 1)
1.5
2
275, 290 3 (TV 3)
T
(0)
3
4 0
305, 315 10 (TV 10)
6
8
3VT9 463-6AP00
630 345, 360 30 (TV 30)
10
10
400, 435 3 (TV 3)
8
6
455, 480 8 (TV 8)
T
(t)
4
3 50
500, 550 15 (TV 15)
2
1.5
375, 630 25 (TV 25)
0.8
1
400, 435 1 (TV 1)
1.5
2
455, 480 3 (TV 3)
T
(0)
3 4 0
4
500, 550 10 (TV 10)
6
9
3VT9 480-6AP00
800 575, 610 30 (TV 30)
12
12
630, 685 3 (TV 3)
9
6
722, 760 8 (TV 8)
T
(t)
4
3 50
800, 866 15 (TV 15)
2
1.5
909, 1000 25 (TV 25)
1
1.25
400, 435 1 (TV 1)
2
3
455, 480 3 (TV 3)
T
(0)
5
0
7
500, 550 10 (TV 10)
9
12
3VT9 410-6AP00
1000 575, 610 30 (TV 30)
14
12
630, 685 3 (TV 3)
12
9
722, 760 8 (TV 8)
7
T
(t)
5 50
800, 866 15 (TV 15)
3
2
909, 1000 25 (TV 25)
1.25