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3VT1 Molded Case Circuit Breakers up to 160 A
Accessories and Components
Motorized operating mechanisms
2/27
Siemens LV 36 · 2008
2
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Design
Motorized operating mechanisms
The motorized operating mechanism is an accessory of the cir-
cuit breaker/switch disconnector, by means of which it is possi-
ble to switch the circuit breaker or switch disconnector remotely
on and off. The modular design of the operating mechanism en-
ables its simple mounting on the circuit breaker (also addition-
aly). The operating mechanism is used for both remote and local
control of 3VT1 3-pole and 4-pole circuit breakers. It is manufac-
tured in the version for lateral mounting next to the circuit breaker
on the switchboard or for mounting on standard mounting rails.
The operating mechanism is fastened by means of a bayonet
mechanism on the circuit breaker side. The installed operating
mechanism can be sealed by means of the terminal cover seal.
3VT1 circuit breakers Modeion with motorized operating mech-
anism are intended for industrial, power engineering and infra-
structure applications. The motorized operating mechanisms
are for direct actuation of the circuit breaker, without a spring
storage unit.
The motorized operating mechanism can work in the local or re-
mote control mode. The local control mode is used, for instance,
in case of loss of the control voltage. Local control of the circuit
breaker is only accessible after lifting the transparent safety
cover off the operating mechanism. This procedure locks the re-
mote electrical control circuits automatically. The lifted position
of the cover can be indicated remotely.
The circuit breaker is switched on and off by means of the
control lever driver
.
After returning the safety cover to the original
position, the operating mechanism is switched automatically into
the remote control mode.
After having taken off the safety cover, it is possible to actuate an
automatic mode selector switch. Under the transparent cover,
there is a red LED. The lighting of the LED indicates a failure
(failed on/off/wind-up operations).
Electronic circuits of the motorized operating mechanism block
erroneous control process, e.g. drive cycling after overcurrent or
auxiliary release tripping.
Lateral operating mechanisms can be locked in „off position“ of
the circuit breaker by up to three padlocks with a shank diameter
of max. 4 mm. It is possible to actuate the locking remotely. The
protective cover of the operating mechanisms can also be
sealed.
Motorized operating mechanism automatic operation presets
The position of the main circuit breaker is indicated by the
position of the circuit breaker driver lever under the transparent
protective cover of the operating mechanism. The wound up po-
sition of the circuit breaker can also be signalled remotely.
In the remote control mode, the circuit breaker is switched on
and off by an ON and OFF pushbutton. The accessories for the
motorized operating mechanism includes an 3VT9 100-3MF00
extension cable .
1)
Standard factory setting of the switch.
2)
When the circuit breaker is switched off by the motorized operating mech-
anism electrically with the use of the OFF push button, the circuit breaker
control lever gets into the wound up position automatically, indepen-
dently of the automatic operation preset.
3)
By pressing the OFF pushbutton,
the motorized operaitng mechanism only
winds the circuit breaker up to the position .
Symbol
Description
Switched on maually or by motorized operating mecha-
nism electrically
Switched off by overcurrent releases, shunt release or
undervoltage release, TEST or REVISION pushbutton
Switched off maually or by motorized operating mecha-
nism electrically, wound up state
Switch
position
Automatic
operation preset
Preset
description
Circuit breaker switching off to
postion
2)
Circuit breaker winding up to
position
Circuit breaker switching
on to position
1
1)
Automatic winding up is
on
By overcurrent release
By REVISION pushbutton
By auxiliary release
By TEST pushbutton
The motorized operating
mechanism carries out
automatically
By pressing the ON pushbutton
2
Automatic winding up is
off
The operator must press the
OFF pushbutton
By pressing the ON push
button
3
Simultaeous winding up
and switching on
By pressing the ON pushbutton, the motorized operating mech-
anism will wind up and switch on the circuit breaker
3)
The motorized operating mechanism is out of operation, the red LED is lighting.
N0
1 2
N0
1 2
N0
1 2
N0
1 2