200 / 267
3VT4 Molded Case Circuit Breakers up to 1000 A
Overcurrent releases
5/14
Siemens LV 36 · 2008
5
Overcurrent trip unit-ETU UP
• For protecting complicated loads or those not specified in
advance
The 3VT9 4..-6AD00 release is intended only for the 3VT4 710-
3AA..-0AA0 switching unit. The release is equipped with a
thermal memory that can be disabled by turning the “restart”
switch on the front panel from the position T
(t)
to the position T
(0)
.
After the thermal memory has been disabled, the thermal re-
lease remains active.
A practical advantage of the release is its maximum flexibility for
adjusting the tripping characteristics. With its possibility for
setting I
2
t = constant and I
5
t = constant, it is optimal from the
selectivity viewpoint for its interaction with fusing devices.
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 just before
tripping will begin to blink red. On the lower part of the release
cover, four photocells are mounted for communicating with the
3VT9 500-6AE00 signalling unit.
Specifications for adjustable releases
Short delayed
short circuit pro-
tection
I
sd
=(n x
I
r
)
Order No.
Rated
current
I
n
Overload
protection
I
r
t
r
(7.2 x
I
r
) n
t
sd
I
2
t
Restart Instantaneous
short circuit
protection
I
A
A
S
A
ms
kA
125, 137 0.5
2
50, 100
0.5
144, 160 3
3
200, 300
on
T
(0)
1
172, 180 5
5
400, 600
1.5
3VT9 431-6AD00 315
200, 220 7
6
800, 1000
2
231, 243 10
8
50, 100
2.5
250, 260 15
9
200, 300
off
T
(t)
3
275, 290 20
10
400, 600
4
305, 315 25
∞
800, 1000
5
250, 260 0.5
2
50, 100
0.8
275, 290 3
3
200, 300
on
T
(0)
1.5
305, 315 5
5
400, 600
2
3VT9 463-6AD00 630
345, 360 7
6
800, 1000
3
400, 435 10
8
50, 100
4
455, 480 15
9
200, 300
off
T
(t)
6
500, 550 20
10
400, 600
8
575, 630 25
∞
800, 1000
10
315, 345 0.5
2
50, 100
1
360, 400 3
3
200, 300
on
T
(0)
1.5
435, 455 5
5
400, 600
2
3VT9 480-6AD00 800
480, 500 7
6
800, 1000
3
550, 575 10
8
50, 100
4
610, 630 15
9
200, 300
off
T
(t)
6
685, 720 20
10
400, 600
9
760, 800 25
∞
800, 1000
12
400, 435 0.5
2
50, 100
1.25
455, 480 3
3
200, 300
on
T
(0)
2
500, 550 5
5
400, 600
3
3VT9 410-6AD00 1000 575, 610 7
6
800, 1000
5
630, 685 10
8
50, 100
7
720, 760 15
9
200, 300
off
T
(t)
9
800, 866 20
10
400, 600
12
909, 1000 25
∞
800, 1000
14