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3VT2 Molded Case Circuit Breakers up to 250 A
Overcurrent releases
3/19
Siemens LV 36 · 2008
3
Overcurrent releases ETU MP - Motors
• Direct protection for motors and generators
• Possibility for protecting lines and transformers
The 3VT9 2..-6AP00 release is intended only for 3VT2725-.AA36-
0AA0 or 3VT2725-.AA46-0AA0 switching units. The operation of
the release is controlled by a microprocessor. The release is
equipped with a thermal memory that can be disabled by turn-
ing a switch on the front panel from position T
(t)
to position T
(0)
.
After disabling of the thermal memory, the thermal release re-
mains active.
When one or two phases fail (due to current greater than
I
r
in the
remaining phases), in the M-characteristic mode, the switch will
open with a 4 s delay (so called undercurrent release).
Another parameter for adjusting the release consists of the rated
current and short-circuit tripping level. The time delay of the
short-circuit release can be set to 0 or 50 ms. 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
. A total of 8 characteristics can be set
on the release. Mode “M” provides 4 characteristics suitable for
protecting motors and in mode “TV” are 4 characteristics for pro-
tecting transformers and lines. The shape of each characteristic
can be changed using a selector switch.
Adjustable specifications
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 (TV 1)
T
(0)
0,125
43 3 (TV 3)
T
(0
0,25
46 10 (TV 10) T
(0
0,4
48 20 (TV 20) T
(0)
0,6
0
50 20 (M 20) T
(0
0,8
55 15 (M 15) T
(0)
1,0
58 8 (M 8)
T
(0
1,25
3VT9 210-6AP00 100 61 3 (M 3)
T
(0
1,5
63 3 (M 3)
T
(t)
1,5
69 8 (M 8)
T
(t)
1,25
72 15 (M 15) T
(t)
1,0
76 20 (M 20) T
(t)
0,8
50
80 20 (TV 20) T
(t)
0,6
87 10 (TV 10) T
(t)
0,4
91 3 (TV 3)
T
(t)
0,25
100 1 (TV 1)
T
(t)
0,125
63 1 (TV 1)
T
(0)
0,2
69 3 (TV 3)
T
(0
0,4
72 10 (TV 10) T
(0
0,6
80 20 (TV 20) T
(0)
1,0
87 20 (M 20) T
(0
1,3
0
91 15 (M 15) T
(0)
1,6
100 8 (M 8)
T
(0
2,0
3VT9 216-6AP00 160 110 3 (M 3)
T
(0)
2,4
115 3 (M 3)
T
(t)
2,0
120 8 (M 8)
T
(t)
2,0
125 15 (M 15) T
(t)
1,6
130 20 (M 20) T
(t)
1,3
137 20 (TV 20) T
(t)
1,0
50
144 10 (TV 10) T
(t)
0,6
150 3 (TV 3)
T
(t)
0,4
160 1 (TV 1)
T
(t)
0,2
100 1 (TV 1)
T
(0)
0,35
110 3 (TV 3)
T
(0
0,5
115 10 (TV 10) T
(0
0,75
125 20 (TV 20) T
(0)
1,0
0
137 20 (M 20) T
(0
1,25
144 15 (M 15) T
(0)
1,5
160 8 (M 8)
T
(0
2,0
3VT9 225-6AP00 250 172 3 (M 3)
T
(0)
2,5
180 3 (M 3)
T
(t)
2,0
190 8 (M 8)
T
(t)
2,0
200 15 (M 15) T
(t)
1,5
210 20 (M 20) T
(t)
1,25
220 20 (TV 20) T
(t)
1,0
50
231 10 (TV 10) T
(t)
0,75
243 3 (TV 3)
T
(t)
0,5
250 1 (TV 1)
T
(t)
0,35