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3VT2 Molded Case Circuit Breakers up to 250 A
Accessories and Components
Motorized operating mechanism
3/35
Siemens LV 36 · 2008
3
Use of 3VT9 200-3M..0 motorized operating mechanism
in the automatic standby system
Wiring diagram of the motorized operating mechanism of the
circuit breaker
In use of 3VT2 circuit breakers with mechanical interlocking by
Bowden cable in the automatic standby system, it is recom-
mended to switch the circuit breaker off only by an auxiliary re-
lease. Otherwise the first attempt of switching a standby circuit
breaker may fail.
Recommended control pulses for switching of the 3VT2 circuit
breakers by the motorized operating mechanism after their
switching off by a shunt release or undervoltage release in the
automatic standby system
M
motor
P
storage device
X3
connector for connection of control circuits
X4
connector for external cycle counter
S5
switch indicating AUTO (NO-C)/MANUAL
(NC-C) mode
YC
external 3VT9 300-3MF10 cycle counter
B
recommended connection of control circuits
(is not included in the motorized operating
mechanism supply)
ON
pushbutton
OFF
pushbutton
S
switch for storage (closed = automatic storage;
it can be closed permanently)
Q3
motorized operating mechanism circuit breaker-
see page E69
L+
Q3
X3
MP
NC NO
S5
C
X3
J
X4
A2
B2
A1
B1
YC
9 7
8
3
6
4
2
1
2
5
1
N-
PE
M P
U
<
U
NSO0_00078
3VT9 300-1U.00
3VT9 300-1S.00
S
B
ON
OFF
cav. no.10
or
Cycle
counter
Control circuit
Motor drive
Symbol
Description
HK
Main contacts
RS
Relative switch
SV
Pulse for shunt release
SP
Pulse for undervoltage release
IMP ON
Motorized operating mechanism make pulse
IMP OFF
Motorized operating mechanism storage pulse (generated
by S switch)
Switched on
Switched off by releases, TEST or REVISION pushbutton
Switched off maually or by motorized operating mecha-
nism electrically (wound up state)
20
0
1
0
1
0
1
0
1
0
1
NSO0_00080
t
[ms]
HK
SP
SV
RS
200
200 … 700
> 880
520
50
> 1400
IMP ON
20
0
1
0
1
0
1
0
1
0
1
NSO0_00081
t
[ms]
HK
SP
SV
RS
>200
> 100
200 … 700
400 …
∞
> 880
X + 520
50
X
> 1400
IMP ON
IMP S