233 / 267
3VT5 Molded Case Circuit Breakers up to 1600 A
Accessories and Components
Motorized operating mechanism
6/31
Siemens LV 36 · 2008
6
■
Technical specifications
The motor drive is part of circuit breaker accessories enabling
you to switch the circuit breaker on and off remotely. Modular de-
sign of the drives enables easy installation on the circuit breaker
after removing the cavity cover from the circuit breaker. 3VT cir-
cuit breakers with motor drives can be used in the most demand-
ing industrial applications such as protection of standby
sources, synchronization of two sources, etc. and anywhere it is
necessary to ensure automated and unmanned operation of
electrical equipment. As the motor drives are equipped with
spring storage to accumulate energy necessary for activation, it
is possible to turn on the circuit breaker in times up to 70 ms. Re-
leasing of the storage device and turning on the circuit breaker
is ensured by a closing coil included in standard equipment of
every motor drive. The time before the circuit breaker breaks
contact on account of a motor drive is approx. 10 s. This tripping
method is applicable for controlling technological entities. When
faster circuit breaker tripping is required (e.g. emergency STOP
button), it is possible to use the motor drive combined with und-
ervoltage release or shunt trip.
• On the motorized operating mechanism front panel there is a
switch selector to select drive modes with a possibility to indi-
cate remotely the state of this switch. The first mode is auto-
matic remote control (position AUTO). This is the standard po-
sition in automatic operation. The other mode is manual
control (selector position MANUAL), the motorized operating
mechanism does not need any voltage to perform its opera-
tion.
• When the selector is in position AUTO, it is possible to switch
on and off remotely with the push buttons that must be wired
to the connector on the drive. When the drive is in MANUAL
mode, the circuit breaker can be switched on using the green
button on the front part of the drive cover and to switch it off
with the red TEST button on the overcurrent release unit. The
function of the remote control ON button in MANUAL MODE is
locked up, whereas the function of the remote control OFF but-
ton remains active for safety reasons.
• The motor drive makes it simple to control the circuit breaker
when there is a loss of control voltage. In MANUAL mode, it is
possible to wind up the spring storage assembly by repeated
rotation of the foldable handle. After the storage is wound up,
the circuit breaker can be turned on using the green button on
the front part of the insulation cover of the drive and it can be
turned off using the red TEST button on the overcurrent re-
lease.
• The motorized operating mechanism, unlike the circuit
breaker, recognizes only two fixed positions. In position one,
the circuit breaker is in on-state. If the circuit breaker in AUTO
mode is put in off-state by some overcurrent releases, auxiliary
trip devices or from a distance, the 3VT9 500-2AF10 switch
(included in motorized operating mechanism delivery) will
generate a pulse to load the spring storage mechanism auto-
matically as a result of electrical linkage with the circuit
breaker . If the switch is not placed in cavity 3 or 4, no auto-
matic loading process will take place.
In the second fixed position the circuit breaker is switched off
and the loaded drive device is ready to activate the circuit
breaker after receiving the control pulse.
• The presence of the control voltage in the drive is indicated by
a steadily lit green LED indicator below the drive plate. If the
indicator is not lit, the position of the circuit breaker lever need
not comply with the correct positions of the power contacts.
• The drive may be furnished with an electromechanical opera-
tions counter.
• The drive can be locked up in off-state position using the built-
in cylinder type lock and using as many as three padlocks with
the shank diameter max. 7 mm. Before the drive is locked up,
it is necessary to turn the drive unit switch to MANUAL mode
position, to withdraw the drive unit yellow lockup strip and to
insert the padlock shank into the oval opening in the lockup
strip. When a cylinder type lock is used, the lockup strip will
run out a little.
• An 3VT9 500-3MF20 cover can be affixed to the drive’s turn-
on switch and then sealed. The cover prevents turning on the
circuit breaker from the drive panel.
Specifications
1)
for sequence of control pulses, see page 6/44.
Type
3VT9 500-3M...0
Operational voltage U
e
V
AC 110, 230
DC 110, 220
Rated frequency f
n
Hz
50/60
Control pulse length for switching on ms
>
20 ... 1500
∞
1
Control pulse length for switching off ms
>
20 ...
∞
1)
Time to switching on
ms
< 70
Time to the accumulating of
motor drive under voltage U
e
• AC 230 V
s
14
• DC 220 V
s
18
Time to switch-off U
e
• AC 230 V
10
• DC 220 V
12
Frequency of ON/OFF cycles
cycles/
min
2
Frequency of cycles - immediatly one
after another ON/OFF
cycles 8
Mechanical endurance
cycles 10000
Input power
• AC
VA 200
• DC
W 200
Protection
• AC 110 V; AC 230 V
LSN 4C/1; LSN 2C/1
• DC 110 V; DC 220 V
LSN-DC 4C/1; LSN-DC 2C/1
Rated operating current of the switch
selector AUTO / MANUAL
I
e
/U
e
V
6 A/AC 250