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3VT2 Molded Case Circuit Breakers up to 250 A
Overcurrent releases
3/23
Siemens LV 36 · 2008
3
Overcurrent releases ETU DPN - Distribution with protected
N pole
• Protecting lines and transformers in TN-C-S and TN-S
networks
The 3VT9 2..-6BC00 release is intended only for the
3VT2 725-.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 ac-
tive.
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 ad-
justed.
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 signaling
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_00223
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
I
n
= 100 A
I
n
= 160 A
I
n
= 250 A
t
r
[
S
]
I
r
min.
max.
I
i
I
N
= 0.5 x
I
r
1 x
I
r
0.75 x
I
r
I
N
I
r
t
r
I
n
I
i
9 x
I
r
7 x
I
r
4 x
I
r
2 x
I
r
Order No.
Rated
cur-
rent
I
n
Over-
load
protec-
tion
I
r
t
R
(7,2 x
I
r
) Restart Instantaneous
short circuit
protection
I
i
A A S
kA
ms
40 1
T
(0)
3
43
T
(0)
5
0
46 3
T
(0)
7
48
T
(0)
9
50 10
T
(0)
3
55
T
(0)
5
100
58 20
T
(0)
7
3VT9 210-6BC00 100 61
T
(0
9
63 20
T
(t)
3
69
T
(t)
5
200
72 10
T
(t)
7
76
T
(t)
9
80 3
T
(t)
3
87
T
(t)
5
300
91 1
T
(t)
7
100
T
(t)
9
63 1
T
(0)
3
69
T
(0)
5
0
72 3
T
(0)
7
80
T
(0)
9
87 10
T
(0)
3
91
T
(0)
5
100
100 20
T
(0)
7
3VT9 216-6BC00 160 110
T
(0)
9
115 20
T
(t)
3
120
T
(t)
5
200
125 10
T
(t)
7
130
T
(t)
9
137 3
T
(t)
3
144
T
(t)
5
300
150 1
T
(t)
7
160
T
(t)
9
100 1
T
(0)
3
110
T
(0)
5
0
115 3
T
(0)
7
125
T
(0)
9
137 10
T
(0)
3
144
T
(0)
5
100
160 20
T
(0)
7
3VT9 225-6BC00 250 172
T
(0)
9
180 20
T
(t)
3
190
T
(t)
5
200
200 10
T
(t)
7
210
T
(t)
9
220 3
T
(t)
3
231
T
(t)
5
300
243 1
T
(t)
7
250
T
(t)
9