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3VT2 Molded Case Circuit Breakers up to 250 A
Overcurrent releases
3/21
Siemens LV 36 · 2008
3
Overcurrent releases ETU MPS - Motors with setting timing
selectivity
• Direct protection for motors and generators
• Possibility for protecting lines and transformers
• Enables adjusting time delay of independent release
The 3VT9 2..-6AS00 release is intended 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 is the rated current
and tripping level of the delayed short-circuit release. The time
delay (t
sd
) can be set on the delayed short-circuit release at 0,
100, 200 or 300 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
protecting transformers and lines. The shape of each character-
istic can be changed using a selector switch.
Adjustable specifications
Order No.
Rated
cur-
rent
I
n
Over-
load
protec-
tion
I
r
t
sd
(7.2 x
I
r
) Restart Short circuit
protection
(short time
delayed)
I
i
A A S
kA
ms
40 1 (TV 1)
T
(0)
3
43 3 (TV 3)
T
(0)
5
0
46 10 (TV 10) T
(0)
7
48 20 (TV 20) T
(0)
9
50 20 (M 20) T
(0)
3
55 15 (M 15) T
(0)
5
100
58 8 (M 8)
T
(0)
7
3VT9210-6AS00 100 61 3 (M 3)
T
(0)
9
63 3 (M 3)
T
(t)
3
69 8 (M 8)
T
(t)
5
200
72 15 (M 15) T
(t)
7
76 20 (M 20) T
(t)
9
80 20 (TV 20) T
(t)
3
87 10 (TV 10) T
(t)
5
300
91 3 (TV 3)
T
(t)
7
100 1 (TV 1)
T
(t)
9
63 1 (TV 1)
T
(0)
3
69 3 (TV 3)
T
(0)
5
0
72 10 (TV 10) T
(0)
7
80 20 (TV 20) T
(0)
9
87 20 (M 20) T
(0)
3
91 15 (M 15) T
(0)
5
100
100 8 (M 8)
T
(0)
7
3VT9216-6AS00 160 110 3 (M 3)
T
(0)
9
115 3 (M 3)
T
(t)
3
120 8 (M 8)
T
(t)
5
200
125 15 (M 15) T
(t)
7
130 20 (M 20) T
(t)
9
137 20 (TV 20) T
(t)
3
144 10 (TV 10) T
(t)
5
300
150 3 (TV 3)
T
(t)
7
160 1 (TV 1)
T
(t)
9
100 1 (TV 1)
T
(0)
3
110 3 (TV 3)
T
(0)
5
0
115 10 (TV 10) T
(0
7
125 20 (TV 20) T
(0))
9
137 20 (M 20) T
(0)
3
144 15 (M 15) T
(0)
5
100
160 8 (M 8)
T
(0)
7
3VT9225-6AS00 250 172 3 (M 3)
T
(0)
9
180 3 (M 3)
T
(t)
3
190 8 (M 8)
T
(t)
5
200
200 15 (M 15) T
(t)
7
210 20 (M 20) T
(t)
9
220 20 (TV 20) T
(t)
3
231 10 (TV 10) T
(t)
5
300
243 3 (TV 3)
T
(t)
7
250 1 (TV 1)
T
(t)
9