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3VT3 Molded Case Circuit Breakers up to 630 A
Overcurrent releases
4/24
Siemens LV 36 · 2008
4
Overcurrent releases ETU DPN-Distribution with protected
N pole
• Protecting lines and transformers in TN-C-S and
TN-S networks
The 3VT9 3..-6BC00 release is only intended for the
3VT3 763-AA56-0AA0 switching unit. The operation of the re-
lease is controlled 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 dis-
abling of the thermal memory, the thermal release remains
active.
The rated current
I
r
, delay for switching off the release at 7.2
I
r
,
and the tripping level of the short-circuit release can be
adjusted.
The operational state is signalled by an LED indicator that
flashes green in a 1.5 s interval. As the load grows, the blinking
frequency of the diode increases. In case of a load larger than
110% of
I
r
this LED will turn red and will begin to blink red just
before tripping. On the lower part of the release cover are two
photocells for communicating with the prospective signalling
unit.
The current of the fourth pole (N pole) is adjusted using the IN
switch as a multiple of the
I
r
current. Measuring of current on the
fourth pole can be disabled by turning the button to the “OFF”
position.
Tripping characteristics
Adjustable specifications
20
200
2000
50
500
5000
10
100
1000
10000
t
[s]
NSO0_00361
1 2
5
20
50
10
0.1 0.2 0.5
x
I
n
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
N
20
10
3
1
20
10
3
1
I
i
I
r
I
N
t
r
I
N
L
I
t
r
[
S
]
I
i
I
n = 400 A
I
n = 250 A
I
n = 630 A
I
n
= 250 A
I
n
= 400 A
I
n
= 630 A
I
r
min.
max.
I
N
= 0.5 x
I
r
1 x
I
r
0.75 x
I
r
9 x
I
r
7 x
I
r
4 x
I
r
2 x
I
r
I
N
I
r
t
r
I
n
I
i
Order No.
Rated
current
I
n
Overload
protection
I
r
t
r
(7.2 x
I
r
) Restart
A A
S
ms
100
1
110
2
0,5
115
3
T
(0)
125
137
10
144
4
0,75
160
20
3VT9 325-6BC00 250 172
180
20
190
7
1
200
10
T
(t)
210
220
3
231
9
OFF
243
1
250
160
1
172
2
0,5
180
3
T
(0)
190
200
10
210
4
0,75
220
20
3VT9 340-6BC00 400 231
243
20
250
7
1
275
10
T
(t)
290
315
3
345
9
OFF
360
1
400
250
1
260
2
0,5
275
3
T
(0)
290
305
10
315
4
0,75
345
20
3VT9 363-6BC00 630 360
400
20
435
7
1
455
10
T
(t)
480
500
3
550
9
OFF
575
1
630