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3VT2 Molded Case Circuit Breakers up to 250 A
Accessories and Components
Motorized operating mechanism
3/34
Siemens LV 36 · 2008
3
Recommended actuating pulses
Circuit breaker switched on/off by the motorized operating
mechanism – S switch permanently closed (automatic storage)
or open
Circuit breaker switched off by the overcurrent or auxiliary
releases and switched on by the motorized operating mecha-
nism – S switch permanently closed (automatic storage)
Circuit breaker switched off by the overcurrent or auxiliary
releases and switched on by the motorized operating mecha-
nism – S switch closed only for storing up
Description of charts
Circuit breaker states and toggle positions of the circuit breakers
NSO0_00245
t
[ms]
1
0
1
0
1
0
HK
PS
400 …
∞
800
800
20 … 700
> 100
> 1400
50
> 600
IMP OFF
IMP ON
NSO0_00246
t
[ms]
1
0
1
0
1
0
HK
RS
R
520
20 … 700
> 1400
50
> 880
OFF
IMP ON
NSO0_00247
t
[ms]
1
0
1
0
1
0
HK
RS
R
X + 520
20 … 700
> 1400
X
50
400 …
∞
> 880
> 100
OFF
IMP ON
IMP S
Symbol
Description
HK
main contacts
PS
auxiliary switch
RS
relative switch
R OFF
circuit breaker closing instant by release
IMP S
pulse to store up motorized operating mechanism energy
(generated by S switch)
IMP ON
make pulse for motorized operating mechanism
IMP OFF
break pulse for motorized operating mechanism
X
random segment of time
Circuit breaker state
Toggle positions of circuit breakers
Switched on
Switched off by releases, or by TEST
button or by the trip pushbutton on
the motorized operating mechanism
Switched off manually or electrically
by the operating mechanism