74 / 267
3VT2 Molded Case Circuit Breakers up to 250 A
Overcurrent releases
3/18
Siemens LV 36 · 2008
3
Overcurrent releases ETU DP - Distribution
Protecting lines and transformers
The 3VT9 2..-6AC00 release is intended only for
3VT2725-.AA36-0AA0 or 3VT2725-.AA46-0AA0 switching units.
Operation of the release 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 disabling the thermal memory, the thermal release re-
mains active. The operational state 70% of
I
r
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 releases have tripping characteristics especially designed
for practical purposes that provide for optimal exploitation of
transformers up to 1.5
I
r
.
The releases offer simple adjustment of the tripping characteris-
tics. Set-up includes only the rated current and the short-circuit
tripping level at 4
I
r
or 8
I
r
.
Tripping characteristics
Adjustable specifications
NSO0_00219
x
I
n
1 2
5
20 50
10
0.1 0.2 0.5
0.02
0.02
0.05
0.05
0.01
0.01
20
200
2000
50
500
5000
10
100
1000
10000
t
[s]
0.01
0.02
0.05
0.1
0.1
0.1
0.2
0.5
1
2
5
x
4x
4x
8x
8x
4x
4x
8x
8x
4x
4x
8x
8x
I
L
I
i
I
i
I
i
I
n
= 100 A
I
n
= 160 A
I
n
= 250 A
I
n
= 100 A
I
n
= 160 A
I
n
= 250 A
I
r
I
i
3
3
I
r
min.
max.
Order No.
Rated
current
I
n
Overload
protection
I
r
Restart
Instantaneous
short circuit
protection
I
i
A
A
40
43
46
48
50
55
58
3VT9 210-6AC00 100
61
T
(0)
4 x
l
r
63
T
(t)
8 x
l
r
69
72
76
80
87
91
100
63
69
72
80
87
91
100
3VT9 216-6AC00 160
110
T
(0)
4 x
l
r
115
T
(t)
8 x
l
r
120
125
130
137
144
150
160
100
110
115
125
137
144
160
3VT9 225-6AC00 250
172
T
(0)
4 x
l
r
180
T
(t)
8 x
l
r
190
200
210
220
231
243
250