154 / 267
3VT3 Molded Case Circuit Breakers up to 630 A
Accessories and Components
Motorized operating mechanisms
4/34
Siemens LV 36 · 2008
4
Tripping of the circuit breaker with a motorized operating mech-
anism by the overcurrent release (switch S in switched-on state
– automatic storage)
Tripping of the circuit breaker with motorized operating mecha-
nism by a shunt release or undercurrent release (switch S in
switched-on state – automatic storage)
Wiring diagram
Circuit breaker switched on by motorized operating mechanism
(electrical pushbutton ON) and switched off by the shunt release
Circuit breaker switched on by motorized operating mechanism
(electrical pushbutton ON) and switched off by undervoltage re-
lease
Recommended actuating pulses
Circuit breaker switched on/off by motorized operating mecha-
nism - S-switch permanently closed (automatic storage) or open
20
20
20
30
20
30
20
650
650
30
0
1
0
1
0
1
0
1
0
1
0
1
0
1
t
[ms]
650
650
NSO0_00527
2
4
6
1
3
5
3.4 3.3
3.2 3.1
2.4 2.3
2.2 2.1
1.4 1.3
1.2 1.1
Main contacts
Auxiliary switch
Auxiliary switch
Relative switch
Relative switch
Early switch
Early switch
accessory
compartment
2
accessory
compartment
3
accessory
compartment
1
20
20
20
20
30
520
30
520
0
1
0
1
0
1
0
1
0
1
NSO0_00242
t
[ms]
2
4
6
1
3
5
3.4 3.3
3.2 3.1
2.4 2.3
2.2 2.1
accessory
compartment
3
accessory
compartment
2
Main contacts
Auxiliary switch
Auxiliary switch
Relative switch
Relative switch
J
X4
A2
B2
A1
B1
YC
3
6
4
2
1
2
5
1
X3
MP
NC NO
S6
C
X3
12 10
11
M P
U
<
U
NSO0_00371
3VT9 300-1U.00
3VT9 300-1S.00
B
PE N-
NC NO
S5
C
9 7
8
L+
Q3
S
N-
or
acc.c. no.10
Control circuit
Motor drive
ON
OFF
Operations
counter