WEG VBWC Series Manual

Motors | Automation | Energy | Transmission & Distribution | Coatings
Installation, Operation and Maintenace Instruction
Instrucciones de Instalación, Operación y Mantenimiento
Manual de Instalação, Operação e Manutenção
Vacuum Circuit Breaker
Disyuntor a Vacío
Disjuntores a Vácuo

Vacuum Circuit Breaker -
Installation, Operation
and Maintenace Instruction
Series: VBWC
Language: English
Document: 10008260126 / 00
Date: 01/2021

Summary
1 SAFETY INSTRUCTIONS! 6
2 SAFETY PRECAUTIONS 6
3 UNPACKING AND SERVICE CONDITIONS 8
3.1 UNPACKING..........................................................................................................................................8
3.2 SERVICE CONDITIONS (INDOOR TYPE)............................................................................................8
4 TRANSPORTING, STORAGE AND DISPOSAL 9
4.1 TRANSPORTING..................................................................................................................................9
4.2 STORAGE..............................................................................................................................................9
4.3 DISPOSAL .............................................................................................................................................9
5 INSTALLATION 10
6 CONSTRUCTION FEATURES 12
7 CODING 13
8 ACCESSORIES 14
8.1 UNDER VOLTAGE TRIP DEVICE, [UVT] ............................................................................................15
8.1.1 Specionation of Remote Control Cables minumum gauge....................................................15
8.1.2 UVT assembly position and wiring diagram. ..........................................................................15
8.2 LATCH CHECKING SWITCH (LCS)....................................................................................................15
8.3 KEY LOCK...........................................................................................................................................16
8.4 “ON”,”OFF ” BUTTON COVER...........................................................................................................16
8.5 “ON”,”OFF ” BUTTON PADLOCK......................................................................................................16
9 STRUCTURE AND OPERATION 17
9.1 FRONT VIEW .......................................................................................................................................17
9.2 OPERATING METHOD FOR OPERATING MECHANISM .................................................................17
9.2.1 Manual operation ......................................................................................................................17
9.2.2 Remoto Operation.....................................................................................................................18
9.2.3 High-speed reclosing operation...............................................................................................18
9.3 OPERATING SEQUENCE ...................................................................................................................19
9.4 OPERATING FREQUENCY.................................................................................................................19
9.5 MAIN CIRCUIT ....................................................................................................................................20
9.6 VACUUM INTERRUPTER (VI).............................................................................................................20
10 MAINTENANCE AND INSPECTION 21
10.1 GENERAL CAUTION.........................................................................................................................21
10.2 ROUTINE INSPECTION....................................................................................................................21
10.3 PERIODIC INSPECTION...................................................................................................................22
10.4 SPECIAL INSPECTION.....................................................................................................................23
11 LUBRICANT POINTS FOR OPERATING PARTS 24
12 ELECTRICAL DIAGRAM 26
13 DIMENSIONAL 28

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6 | Vacuum Circuit Breaker
1 SAFETY INSTRUCTIONS!
Please read carefully this safety instructions before products are put into service;
This manual should be retained by those who in charge of maintenance and repair or ultimate users;
This instruction manual shall be kept within easy reach of users.
2 SAFETY PRECAUTIONS
Please follow the safety precautions which is to prevent users from any possible electrical accidents or dangers
in advance by using the product properly and safely.
Safety precaution is classified into three safety alert symbols, Danger, Caution, and Warning. The meanings are
as follows:
DANGER!
Not following this instruction may result in serious injury or even sudden death.
WARNING!
Not following this instruction may result in serious injury or even death.
CAUTION!
Not following this instruction may result in light injury or product damage.
The meaning of each symbol in this manual and on your products is as follows.
This is the safety alert symbol which is to warn users of dangerous situation or to call attention to careful operation.
Read and follow instructions carefully to avoid dangerous situation.
This symbol alerts the users to the presence of “dangerous voltage” which may result in an electric shock under specified
conditions.
DANGER!
Do not touch the electrically charged parts (Conductor and Terminal conducting parts)
under energized conditions.
Otherwise, it may result in severe physical injury or even death by electric shock.

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Vacuum Circuit Breaker | 7
WARNING!
1. Inspection and maintenance have to be performed by a qualified electrician.
Otherwise, there is the danger of malfunction, severe physical injury or electric shock.
2. When the circuit breaker is in service, don’t open the front cover.
Otherwise, there is the danger of severe physical injury or electric shock.
3. Do not contact the internal structure when front cover is opened.
Otherwise, there is the danger of severe physical injury or electric shock.
4. Inspection and maintenance have to be performed only after shutting off the electric power and
discharging a charge current.
Otherwise, there is the danger of severe physical injury or electric shock.
5. Please tighten the bolts and screw with specified torque.
Otherwise, there is the danger of over-heat or fire.
6. After performing installation, maintenance or inspection, remove some foreign objects like tools, wires or bolts.
Otherwise, there is the danger of short circuit or fire.
7. Do not move a circuit breaker by holding main circuit terminals.
Otherwise, there is the danger of an electric accidents by temperature rise.
CAUTION!
1. Do not alter the control circuit at one’s discretion.
Otherwise, there is the danger of malfunction or damage to products.
2. The circuit breakers must be kept in dry condition and keep away from the water.
Otherwise, there is the danger of deterioration of insulation.
3. This product must be stored at the place with no corrosive gas.
Otherwise, there is the danger of a product damage (discoloration, temperature rise or burns on contacts due to the
increased contact resistance).
4. When storing VCB for a long period of time, put dust cover on them to prevent dust from entering.
Otherwise, it may result in electrical accidents during the operation since dielectric strength gets reduced.

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8 | Vacuum Circuit Breaker
3 UNPACKING AND SERVICE CONDITIONS
3.1 UNPACKING
1. When unpacking the package, take care to handle the circuit breaker, standard components and accessories.
2. Certify that the instruction manual and a testreport of final testing were packed inside each PVC envelop.
3. If damage or breakage of products are founded, immediately notify WEG sales office or service representatives.
4. If damage or breakage of products by the carrier are founded, immediately file a claim with the carrier and
notify the shipping company.
3.2 SERVICE CONDITIONS (INDOOR TYPE)
1. Normal service condition
Design to IEC 62271-100(IEC 62271-1), with the following limits values:
Ambient temperature
Maximum: +40 ºC
Média máxima em 24 horas: +35 ºC
Minimum: -5 ºC
Maximum site altitude: ≤ 1000 m above sea level
Relative Humidity
24 hour average value: ≤ 95%
One month average value: ≤ 90%
2. Special service conditions
Special service conditions are to be agreed on by the manufacturer and user.
The manufacturer must be consulted in advance about each special service conditions using at the
following cases or places:
Higher level of site altitude or ambient temperature exceeding the normal conditions;
At place much influence by sea wind;
At a wet place with high humidity usually;
At places with much water or oil vapors;
At places with an explosive, flammable or noxious gas;
At places with much dust;
At places with abnormal vibration or impact;
At places with much ice and snow;
In case of using at other special conditions besides above cases.

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Vacuum Circuit Breaker | 9
4 TRANSPORTING, STORAGE AND DISPOSAL
4.1 TRANSPORTING
WARNING!
1. Do not move the circuit breaker by handling main circuit bus terminals.
Otherwise, there is the danger of electric accidents by temperature increasing.
1. Please use hook and rope to lift or transport the circuit breaker. The hook should be put into the designated
hole or position.
2. Before inserting circuit breaker into the electrical panel, please remove the lifting hooks.
3. When placing the circuit breaker on the ground, be careful not to drop or to impact the breaker.
Figure 4.1: Circuit Breaker
4.2 STORAGE
CAUTION!
1. The circuit breakers must be stored in clean, dry, dust and condensation- free environment.
Otherwise, may cause a weakness of insulation.
2. The products must be stored at the place with no corrosive gas.
Otherwise, there is the danger of a product damage (discoloration, temperature rise or burns on contacts due to the
increased contact resistance).
4.3 DISPOSAL
CAUTION!
1. When making a disposal, dispose it at a designated place with no affection to environment.
Otherwise, may cause an environmental pollution.
1. According to the ISO 14000, separate all of them as metallic or non-metallic material and dispose them at a
designated place after dividing all of material as renewable materials and other materials which may cause an
environmental pollution.
2. In case of being materials whatever you want to remake please contact us.
3. In case of special materials making noxious gas when destroying by fire, be sure to dispose them at an
approved place.

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10 | Vacuum Circuit Breaker
5 INSTALLATION
CAUTION!
1. VCB life span and performance can be guaranteed when periodic visual inspection and maintenance are in place.
It shall be kept clean by removing the foreign objects around or inside switchgear.
Corrective action shall be taken in advance to limit any dust and high humidity since they may result in unexpected
faults or accidents.
Switchgear door shall be well closed to prevent any kinds of animals goes into the switchgear and cause accidents.
Sufficient effort shall be made to maintain it in a dry condition if it is installed in presence of high humidity or during
the rainy season. Humidity is fatal to electricity.
Check if the cables or bars connected in the VCB presented fail in the isolation.
The corrective action shall be taken if the installation place has a higher or lower temperature than specified operating range.
2. Any incident or damage resulting from customers neglect or mistake will void the warranty.
WARNING!
1. Installing VCB at outdoor switchgear.
Extra care shall be taken to avoid condensation on the surface of VCB insulating materials by suitable ventilation or
inner heating.
Use after performing Insulation resistance or dielectric strength test. (More than one time per quarter).
The reduced dielectric strength can be a major factor causing short-circuit.
For safe and normal operation of circuit breaker installed in switchgear, a very careful and special installation
should be followed.
Handle with care when raising up by lift, etc. because circuit breaker lurches;
When installing a fixed type of circuit breaker into switchgear, fix the contactor with same torque value
by passing through mounting holes (6-Ø14) after inserting spring washers into head of bolt without high
pressure or alteration;
Take care not to apply pressure or permanent tension by bus bars or others to main bus terminals;
Remove dust or other foreign substances;
When bolting, follow the recommended torque value specified in Table 5.1.
WARNING!
1. When making bolts and screw assembling, follow the instruction with recommended torque values.
Otherwise, may result in over-heat or burns.
2. Do not alter the control circuit at one’s discretion.
Otherwise, may cause of malfunction or damage to products.
Torque
Size of bolt
Steel
(kgf·cm )
Brass
(kgf·cm)
M 3 7.3 (6.2 - 8.4) 4.3 (3.7 - 4.9)
M 3.5 11.2 (9.5 - 12.9) 6.6 (5.6 -7.6)
M 4 16.8 (14.2 - 19.3) 9.8 (8.4 - 11.3)
M 5 33.0 (28 - 37) 19.1 (16.2 - 22.0)
M 6 56.0 (48 - 65) 33.0 (28 - 38)
M 8 135 (115 - 156) 89 (68 - 91)
M 10 270 (230 - 310) 159 (135 - 182)
M 12 470 (410 - 540) 270 (230 - 310)
Table 5.1: Torque value

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Vacuum Circuit Breaker | 11
Figure 5.1: Installation
1. Vertical Insulation Barrier
2. Horizontal Insulation Barrier
3. Vaccum Interrupters slots
Installation
1. The insulation Barrier (1) is iserted between the Vacuum Interrupters, as per the details figures.
2. Assembly the Vertical Barrier firstly and then the horizontal barrier in the connection part as per detail figure.
3. Assembly the Circuit Breaker in the Switchgear, align the fixing holes with the fixing base of Switchgear. Use
M12 bols, nuts and washers to fix the Circuit Breaker.
4. The earthing cable must be fixed in the hole with Earth Symbol.

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12 | Vacuum Circuit Breaker
6 CONSTRUCTION FEATURES
Spring load indicator -
Loaded / Unloaded
ON/OFF
status indicator
OFF button
Manual spring charger
Control connectors
Operation counter
ON button
Figure 6.1: VBWC

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Vacuum Circuit Breaker | 13
7 CODING
VBWC - 17 P 25 A 06 M4 C4 T4 SA2 U0 A0
WEG vacuum circuit
Voltage Class [kV]
17 17,5
Version
PFixed
Rated short-circuit current (kA)
25 25
Auxiliary contact
SA2 4NO4NC
Rated current (A)
06 630
13 1.250
Motor
MO WITHOUT
M1 24~30 V dc
M2 48~60 V dc/48 V ac
M3 100~130 V ac/V dc
M4 200~250 V ac/V dc
Closing release
C0 WITHOUT
C1 24~30 V dc
C2 48~60 V dc/48 V ac
C3 100~130 V ac/V dc
C4 200~250 V ac/V dc
Opening release
T0 WITHOUT
T1 24~30 V dc
T2 48~60 V dc/48 V ac
T3 100~130 V ac/V dc
T4 200~250 V ac/V dc
Bobina de subtensão
U0 WITHOUT
U1 24~30 V dc
U2 48~60 V dc/48 V ac
U3 100~130 V ac/V dc
U4 200~250 V ac/V dc
Other accessories
A0 WITHOUT
A1 Opening release (secondary)
A2 Key lock
A3 Pushbutton lock
A4 Pad locking of the pushbuttons
Distance between poles Rated current (A))
A150 630 - 1.250
Figure 7.1: VBWC Codification

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14 | Vacuum Circuit Breaker
8 ACCESSORIES
Figure 8.1: VBWC Standard and Optional Accessories
19
210
3
6
11
4
7
5
8
Figure 8.2: Accessories
Type Accessory Supply Note
Internal
1Motor operator Default1) Assembled at the factory
2Closing release Default1) Assembled at the factory
3Opening release Default1) Assembled at the factory
4Undervoltage release Optional Assembled at the factory
5Auxiliary contact (4NO4NC) Default Assembled at the factory
6Operation counter Default Assembled at the factory
7Key lock Optional Assembled at the factory
External
8Pushbutton cover Optional Assembled at the factory
9 Pad locking of the pushbuttons Optional Assembled at the factory
10 Condenser trip device Optional Sold separately
11 Delay module for undervoltage release Optional Sold separately
Table 8.1: Accessories
Note *1,2 and 3) For voltage 200 ~ 250 V.

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8.1 UNDER VOLTAGE TRIP DEVICE, [UVT]
UVT coil trip the VCB when the voltage is lower than 0.6x Nominal Voltage;
UVT coil is instantaneous. The UVT time delay controller is able to adjust the delay tripping up to 3s.
The operation of the VCB is not possible mechanically or electrically if the voltage of UVT coil is smaller than
the voltage range showed in the tabel below. UVT coil connection is by terminals D1 and D2
Rated voltage (Vn) Operating voltage range (V) Power consumption (VA or W) Trip time (ms)
DC (V) AC (V) Pick up Drop out Inrush Steady-state
24~30 -
0.65~0.85 Vn 0.4~0.6 Vn 200 5≤50 m/s
48~60 48
10 0~13 0 100~13 0
200~250 200~250
Table 8.2: UVT Coil Characteristics
8.1.1 Specionation of Remote Control Cables minumum gauge
Refer to the below table regarding the length of wire when using trip coil with 24~30 [V] or 48~60 [V] of rate voltage
as power consumption due to inrush current is about 200 VA for coil operation. Coil can be non-operating in case
of not corresponding with the wire specification listed below:
Rated voltage (Vn)
DC 24~30 (V) DC/AC 48 (V)
Wire type #14 AWG (2,08 mm2) #16 AWG (1.31 mm2) #14 AWG (2.08 mm2) #16 AWG (1.31 mm2)
Operating Voltage 100% 48,5 m 30,5 m 233,2 m 143,9 m
85% 13,4 m 8,8 62,5 m 39,3 m
Table 8.3: Cable Control Minumum Gauges
8.1.2 UVT assembly position and wiring diagram.
UVT Coil
Figure 8.3: UVT Coil
8.2 LATCH CHECKING SWITCH (LCS)
LCS indicating the state whether the closing operation is available or not;
Output “b” contact can be generated at OFF & Charge status. And this condition means it’s ready for
closing operation.
Figure 8.4: Latch Checking Switch
*When the Latch is in abnormal position, this LCS prevents the closing operation even though there is a ‘Closing’ operation signal if you
connect LCS to the Closing coil in series.

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16 | Vacuum Circuit Breaker
8.3 KEY LOCK
It allows locking the VBW circuit breaker in the OFF position.
Instruction
KEY cannot be separated in UNLOCK position, and only separated in the LOCK position;
After “OFF” button of circuit breaker is pushed, rotate a key counterclockwise direction and separate a key.
In LOCK position, the closing of a circuit breaker is impossible mechanically or electrically;
After inserting a key and rotating clockwise, the pushed “OFF” button returns in the original position. Then,
the closing of a circuit breaker is possible mechanically or electrically.
Key lock
Figure 8.5: Key lock
8.4 “ON”,”OFF ” BUTTON COVER
It is a protection cover to prevent an accident due to unintended operation of ON/OFF button.
Use the push-bar to operate the ON/OFF button.
Tapa de botones
Figure 8.6: Button Cover
8.5 “ON”,”OFF ” BUTTON PADLOCK
To prevent the mis-operating, button padlock protects ‘ON’ or ‘OFF’ button.
It is available to operate after release button padlock.
Button Padlock
Figure 8.7: Button Padlock

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Vacuum Circuit Breaker | 17
9 STRUCTURE AND OPERATION
9.1 FRONT VIEW
1
6
2
3
4
5
7
Figure 9.1: VBWC
1. Push ON Button
2. Push OFF Button
3. Charge/Discharge Indicator
4. ON/OFF Indicator
5. Manual Charging Handle
6. Key Lock Assembly Position
7. Operation Counter
9.2 OPERATING METHOD FOR OPERATING MECHANISM
9.2.1 Manual operation
1. Manual charging
a) Charge the handle 7~ 8 times with full strokes.
b) When the closing spring is completely charged, the charging indicator shows “CHARGED”.
Charge handle
Figure 9.2: Charge handle

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18 | Vacuum Circuit Breaker
2. Manual closing
a) Push ON button.
b) The breaker will be closed.
c) ON/OFF indicator shows “ON” and the charging indicator shows “DISCHARGED”.
Figure 9.3: Manual closing
3. Manual tripping
a) Push the OFF button and breaker will be tripped.
b) The ON/OFF indicator shows “OFF”.
Figure 9.4: Manual tripping
9.2.2 Remoto Operation
4. Electrical operation
Closing operation is done by charging the closing spring from remote control. If pushing OFF button, closing
spring is automatically charged by a geared motor and a circuit breaker is closed by ON button.
5. Electrical closing
Remote closing can be made by energizing the closing coil (CC). Apply the rated voltage to A3+ and A4- of
the control circuit terminalsand close the circuit breaker.
6. Electrical opening (Tripping)
a) Remote opening can be made by energizing the Opening coil (SHT) or the Under Voltage Coil (UVT) device.
b) In the case of SHT, apply the rated voltage to A5+ and A6- of control circuit terminals.
c) In the case of UVT, remote opening is possible by connecting the switch in series to D1+ and D2-,
terminals of UVT coil.
9.2.3 High-speed reclosing operation
This operating mechanism is available for the high-speed reclosing (O-0.3s-CO) operating duty by remote operation
at the status that the main circuit is “CLOSE” and the closing spring is “CHARGED”.
To perform the operating duty of multiple auto reclosing (O – 0.3s – CO – 15s – CO), the closing spring shall be
charged automatically within 15sec. This circuit breaker is available for auto charging of closing spring within 5 sec.

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Vacuum Circuit Breaker | 19
9.3 OPERATING SEQUENCE
The sequence of operating mechanism is as follows.
Closing operation started
Closing Spring Charging Time
(within 5sec.)
Control power source “ON”
Closing operation completed
Closing signal
Opening signal
Motor
ON
OFF
Charging
Discharging
Charging
Discharging
ON
OFF
ON
OFF
ON
OFF
Closing spring
Opening spring
Closing coil
Opening coil
Circuit break
Closing time Opening time
Opening operation
started
Opening
Operation
completed
Figure 9.5: Operating Sequence
9.4 OPERATING FREQUENCY
In order to keep the operating mechanism parts or components at the best service condition, please avoid any
unnecessary operation and also attend the followings.
Make a successive operation 10 operations with the minimum time interval (about 5sec.) required for
charging the closing spring.
(The 30 min. of time interval should be required at least after a successive operation);
Operate 20 times per an hour;
Operate 100 times per a day.
In case of requiring frequent switching operation or any severe operating duty under the dusty and polluted
environment, it needs to be added the frequency of periodic inspection or maintenance.

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20 | Vacuum Circuit Breaker
9.5 MAIN CIRCUIT
Figure 9.6: Structure of main circuit parts.
9.6 VACUUM INTERRUPTER (VI)
Terminal
Shield
Metal bellows
Shield
Arc shield
Ceramic Insulator
Contacts
Metal bellows
Terminal Contact
Figure 9.7: Structure of vacuum interrupter.
The vacuum interrupters has a high dielectric strength with high vacuum integrity (approximately 5TΩ) and the
gap of between a fiexed contact and moving contact is 6~20 mm according to the rated voltage. Both contacts
are designed to extinguish the arc easily and are made of special alloy in order to reduce the contact wearing by
short circuit interruption and the overload, or arc energy when switching. The internal side is completely sealed
to prevent the deterioration of vacuum integrity.