ABB V-Contact VSC Series Quick guide

V-ContactVSC
Installation and service instructions
7.2/12 kV - 400 A

1

1
For your safety!
Make sure that the installation room (spaces, divisions and am-
bient) is suitable for the electrical apparatus.
Check that all the installation, putting into service and mainte-
nance operations are carried out by qualified personnel with suit-
able knowledge of the apparatus.
Make sure that the standard and legal prescriptions are com-
plied with during installation, putting into service and mainte-
nance, so that installations according to the rules of good work-
ing practice and safety in the work place are constructed.
Strictly follow the information given in this instruction manual.
Check that the rated performance of the apparatus is not ex-
ceeded during service.
Check that the personnel operating the apparatus have this in-
struction manual to hand as well as the necessary information
for correct intervention.
Pay special attention to the danger notes indicated in the manual
by the following symbol:
Responsible behaviour safeguards
your own and others’safety!
For any requests, please contact the
ABB Assistance Service.

2
Index
I. Introduction 3
II. Programme for environmental protection 4
III. Application of the standards for X-ray emission 4
IV. Safety information 4
V. Qualified personnel 5
VI.Interventions in the field 5
1. Description 6
1.1.“MAC” magnetic drive 6
1.2. Versions available 7
1.3. Characteristics 7
1.4. Performances 8
1.5. Contactor auxiliary contacts 8
1.6. Compliance with Standards 8
1.7. Protection against short-circuit 8
2. Checking on receipt 9
3. Handling 10
3.1. Handling using a lifting or fork-lift truck 10
3.2. Handling and lifting using a crane for withdrawable contactors 11
4. Storage 11
5. Installation 12
5.1. General 12
5.2. Installation and operating conditions 12
5.3. Normal conditions 12
5.4. Special conditions 12
5.5. Overall dimensions 13
5.6. Assembly and making the connections 15
5.7. Description of the closing and opening operations 20
5.8. Manual emergency opening operation 22
6. Putting into service 23
6.1. General procedures 23
6.2. Racking the contactor in and out 24
6.3. Accessories and tools for the operations 27
7. Maintenance 28
7.1. General 28
7.2. Inspection 28
7.3. Servicing 29
7.4. Servicing following a short-circuit or overload 30
7.5. Repairs 30
7.6. Instructions for dismantling or replacing fuses 31
7.7. Replacement of the contactor fuses 32
7.8. Mounting and dismantling the short-circuit busbar 35
7.9. Putting the contactor back into service 35
8. Spare parts and accessories 36
8.1. List of spare parts 36

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I. Introduction
The instructions in this manual refer to the fixed and withdrawable versions of the VSC series of
contactors. For correct use of the product, please read it carefully.
For the electrical and construction characteristics and the overall dimensions of the V-Contact
VSC contactors, please also see technical catalogue 1VCP000165.
Like all the apparatus we manufacture, theV-Contact vacuum contactors are designed for differ-
ent installation configurations. Furthermore, this apparatus allows further technical and con-
struction modifications (at the customer’s request) to adapt to special installation requirements.
Consequently, this manual may not provide information concerning special configurations of the
apparatus.
Apart from this manual, it is therefore always necessary to consult the latest technical documen-
tation (circuit and wiring diagrams, assembly and installation drawings, any protection coordina-
tion studies, etc.), especially regarding any variants requested in relation to the standardised
configurations.
Only use original spare parts for maintenance operations. The use of non-original spare parts
can cause hazardous malfunctions and the apparatus warranty will no longer be valid.
Please refer to the technical sheets of the Kits for correct assembly of the accessories and/or
spareparts.For furtherinformation, also see the 1VCP000165technical catalogueof the contactor
and the spare parts catalogue.
This manual and all the enclosed drawings must be considered an integral part of the apparatus.
They must be easily to hand at all times for revision and reference.
These instructions do not intend to cover all the details, configurations or variants of the appara-
tus, storage or installation. For this reason, the information given below may sometimes not
contain the instructions regarding special configurations. This does not relieve the user from
their responsibility for using good technical working practices in application, installation, service
and maintenance of the apparatus purchased. Should further information be required, please
contact ABB.
WARNING
Dangerous voltages. Risk of death, serious injury to people, damage to
the apparatus or other objects.
Before carrying out any maintenance operations, turn the power supply off
and earth the apparatus. Read and understand this instruction manual
before installation, service or maintenance of the apparatus.
Maintenance must only be carried out by skilled personnel.The use of
unauthorized spare parts for repairs to the apparatus, modification of the
apparatus itself, or any tampering by unskilled personnel creates hazardous
conditions which may cause death or serious injury to people, or damage to
the apparatus or other objects. Carefully follow all the safety instructions
given in this manual.

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II. Environmental protection programme
The V-Contact vacuum contactors are manufactured in accordance with the ISO 14000 Stan-
dards (Guidelines for environmental management).The production processes are carried out in
compliance with the Standards for environmental protection in terms of reduction in energy
consumption as well as in raw materials and production of waste materials.All this is thanks to
the medium voltage apparatus manufacturing facility environmental management system.
III. Application of the X-ray emission Standards
One of the physical properties of vacuum insulation is the possibility of X-ray emission when the
interrupter contacts are open. The tests carried out at the PTB laboratories (Physikalisch-
Technische Bundesanstalt, in Brunswick - Germany) show that local emission at a distance of
10 cm from the interrupter or pole surface, does not exceed 1 mSv/h.It follows that:
– at the rated service voltage the use of vacuum interrupters is absolutely safe;
– application of the withstand voltage at power frequency, according to the IEC 60694 Standard,
is safe;
– application of a voltage higher than the withstand voltage at power frequency or of a direct
current test voltage, specified in the IEC Standard, cannot be used;
– limitation of the above-mentioned local phenomena, on interrupters with open contacts, de-
pends on keeping the specified distance between the contacts. This condition is intrinsically
guaranteed by correct operation of the drive and by transmission system adjustments.
IV. Safety information
All the installation, putting into service, running and maintenance operations must be carried out
by suitably qualified personnel with in-depth knowledge of the apparatus.
Make sure that the personnel working on the apparatus have this manual to hand and all the
information required for correct intervention.
Strictly follow the information given in this instruction manual.
Make sure that during the installation, service and maintenance stages the standard and legal
requirements for constructing the installations in accordance with the regulations for safety in
the workplace are respected.
Check that the rated performance of the apparatus is not exceeded during service.

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V. Qualified personnel
For the purposes of this manual and the product rating plates, a qualified person is intended as
a person who:
1) carefully reads the instruction manual all the way through.
2) has in-depth knowledge of the installation, construction and service of the apparatus and
knows about the risks connected with any interventions.
3) is qualified and authorised to energise, de-energise, earth and identify the circuits according
to the safety procedures and the local regulations in force.
4) is qualified and authorised to put this apparatus into service, and to carry out maintenance
and repair operations on it.
5) is trained in correct use of protective equipment, such as rubber gloves, hard hats, protective
goggles, face shields, flameproof clothing, etc. according to the safety procedures and the
local regulations in force.
6) is trained in first-aid procedures.
VI. Interventions in the field
ABB can provide competent and well-trained personnel for assistance in the field to give techni-
cal guidance and consultancy regarding installation, complete overhauling, repair and mainte-
nance of apparatus.

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Fig. A
Magneticcircuitin theclosedposition. Fig. B Magnetic circuit with opening coil sup-
plied.
Fig. C
Magnetic circuit in the open position.
1. Description
Themedium voltageV-ContactVSC contactors
are pieces of apparatus suitable for operating
in alternating current and are normally used to
control users requiring a high number of hourly
operations.
The basic contactors consist of:
• moulded polyester resin monobloc contain-
ing the vacuum interrupters
• bistable electromagnet drive
• multi-voltage feeder
• auxiliary contacts
• mechanical status indicator (open/closed).
Apart from what is specified for the fixed
contactors, the withdrawable contactors also
consist of:
• fuseholders preset for DIN or BS fuses (ac-
cording to the customer’s requirements)
• automatic opening device for intervention of
even a single fuse
•truck
• lock which prevents closing during the rack-
ing-in/out operation.
The V-Contact VSC contactor introduces the
drive with permanent magnets - already widely
used,experimentedand appreciated inmedium
voltage circuit-breakers - into the worldwide
panorama of medium voltage contactors.
The experience acquired by ABB in the field of
medium voltage circuit-breakers fitted with
drives with “MABS” permanent magnets, has
made it possible to develop an optimised ver-
sion of the actuator (Bistable MAC drive) for
medium voltage contactors.
Thedriveisoperatedbymeans ofan electronic
feederwhich, with just three versions,can cover
all the power supply voltage values required by
the major international Standards.
1.1.“MAC” magnetic drive
Based on the experience gained in the field of
circuit-breakers with magnetic drive, ABB has
implemented this technology in the field of
contactors.
Themagnetic drive adapts perfectly to this type
of apparatus thanks to its precise and linear
travel.
Thismeans that a simple and direct axial trans-
mission of the movement to the moving con-
tacts of the vacuum interrupter can be realised,
with both electrical and mechanical benefits.
Thedrive, which isof bistabletype, is fitted with
an opening and a closing coil.
The two coils - individually energised - allow
the drive core to be moved from one of the two
stable positions to the other.
The drive shaft is solid with an iron core which
is immersed and held in position in a field gen-
erated by two permanent magnets (fig. A).
Energising the coil opposite to the magnetic
latching position (fig. A) of the core, the mag-
netic field (fig. B) is generated, which attracts
and moves the core into the opposite position
(fig. C).
Every opening and closing operation creates a
magnetic field concordant with the one gener-
ated by the permanent magnets, with the ad-
vantage, during service, of keeping the inten-
sity of the field itself constant as the number of
operations carried out increases.

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Contactor Reference VSC 7 VSC 12 VSC/P 7 VSC/P 12
IEC 60470
Rated voltage [kV] 4.1 7.2 12 7.2 12
Rated insulation voltage
Withstand voltage at 50 Hz [kV] 23 28 23 28
Impulse withstand voltage [kVbil] 60 75 60 75
Rated frequency [Hz] 50-60 50-60 50-60 50-60
Rated service current [A] 4.101 400 400 400 400
Short-time withstand current
Short-time withstand current for 1 s [A] 4.5 6.000 4.000 6.000 4.000
Short-time withstand current for 30 s [A] 4.5 2.500 2.500 2.500 2.500
Rated peak current [kA] 4.6 15 15 15 15
Rated short-circuit time (tk) [s] 4.7 1 1 1 1
Rated values
Operations / hour [N.] 900 900 900 900
Rated load and overload characteristics in category of use:
- (Category AC4) 100 closing operations [kA] 4.103, 4.104 4.000 4.000 4.000 4.000
- (Category AC4) 25 opening operations [kA] 4.103, 4.104 4.000 4.000 4.000 4.000
Rated voltage of the switching devices and auxiliary circuits 4.8, 4.9
Feeder type 1 (24 ...60 DC)
Feeder type 2 (110 ...130 AC-DC)
Feeder type 3 (220 ...250 AC-DC)
Normal current [A] 4.4.101 400 400 400 400
Electrical life (category AC3) [N.] 29.mar 100.000 100.000 100.000 100.000
Electrical life at rated current (cat.AC1 - electrical latching) [N.] 29.mar 1.000.000 1.000.000 1.000.000 1.000.000
Mechanical life [N.] 1.000.000 1.000.000 1.000.000 1.000.000
Short-circuit breaking capacity (O-3min-CO-3min-CO) [A] 4.107, 6.104 6.000 4.000 6.000 4.000
Short-circuit making capacity (O-3min-CO-3min-CO) [A] 4.107, 6.104 15.000 8.000 15.000 8.000
Opening time with electrical latching [ms] 20..30 20..30 20...30 20...30
Closing time [ms] 30..50 30..50 30...50 30...50
Weight [Kg] 20 20 49(*) 49(*)
Overall dimensions [mm] H 371 391 635 635
[mm] W 350 350 531 531
[mm] D 215 215 657 657
Tropicalisation 721-2-1
1.3. Characteristics
(*) Without fuses.
The energy needed for operation is not sup-
plied directly by the auxiliary power supply, but
is always “stored” in the capacitor which acts
as an energy accumulator, and therefore op-
erationalwaystakesplacewithconstant speeds
and times, regardless of the divergence of the
power supply voltage from the rated value.
The auxiliary power supply only has the aim of
keeping the capacitor charged. Consumption
isthereforeminimal.Thepowerrequired is less
than 5 W. In order to re-instate the rated en-
ergy value in the capacitor following an opera-
tion, there is an inrush of 15 W for a duration of
a few tens of milliseconds.
Careful selection of the components and a pre-
cise design make the electronic multi-voltage
feeder extremely reliable, unaffected by elec-
tromagnetic interference generated by the sur-
rounding environment and free of any emis-
sions which may affect other apparatus placed
in the vicinity.
Thesecharacteristics have made itpossible for
theV-ContactVSC contactors to pass the elec-
tromagnetic compatibility tests (EMC) and ob-
tain the CE mark.
1.2.Versions available
The V-Contact VSC are available in the fixed
and withdrawable version with rated voltages
of 7.2 kV and 12 kV.
Their main characteristics are listed below.

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Contactor VSC7-VSC/P 7 VSC12-VSC/P 12
Rated voltage [kV] 2.2/2.5 3.6 3.6/7.2 6.2/7.2 12
Ultimate performances for:
Motors [kW] 1.000 1.500 1.500 3.000 5.000
Transformers [kVA] 1.100 1.600 2.000 4.000 5.000
Capacitors [kVAR] 1.000 1.500 1.500 3.000 4.800 (1)
Ultimate performances for back-to-back
capacitor banks
Rated current [A] 250 250 250 250 Contact ABB
Max. transient current of the capacitor [kA] 8 8 8 8 Contact ABB
Max.transient frequency of the capacitor [kHz] 2.5 2.5 2.5 2.5 Contact ABB
(1)Overvoltage surge ar-
resters are compulsory
between phases and
between phase and
earth.
Un 24 ... 250 V AC-DC
Rated current Ith2= 10 A
Insulation voltage 2500 V 50 Hz (per 1 min)
Electric resistance 3 mOhm
Rated current and breaking capacity in category AC11 and DC11
Un Cos ϕT In Icu
220 V ~ 0,7 — 2,5 A 25 A
24 V – — 15 ms 10 A 12 A
60 V – — 15 ms 6 A 8 A
110 V – — 15 ms 4 A 5 A
220 V – — 15 ms 1 A 2 A
1.5. Contactor auxiliary circuits
10 auxiliary contacts (5 normally open and 5 normally closed) are available on the contactor for
the customer’s use, with the following characteristics.
1.6. Compliance with Standards
V-Contact contactors comply with the Stan-
dards of the major industrialised countries and
in particular with the following Standards:
– IEC 60470 (2000) and IEC 632-1 (1978) for
the contactor;
– IEC 60694 (2002).
1.7. Protection against short-circuit
The value of the installation short-circuit cur-
rent could exceed the breaking capacity of the
contactor. The contactor must therefore have
adequate protection against short-circuit.
Fuse replacement must only be car-
ried out by qualified personnel.
1.4. Performances
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A
E
C
D
F
B
Should any damage or irregularity be noted in
the supply on unpacking, notify ABB (directly
or through the agent or supplier) as soon as
possible and in any case within five days of re-
ceipt.
The apparatus is only supplied with the acces-
sories specified at thetime of ordering and vali-
dated in the order confirmation sent by ABB.
The accompanying documents inserted in the
shipping packing are:
– instruction manual (this document)
– test certification
– identification label
– fiscal copy of the shipping advice note
– electric wiring diagram.
Other documents which are sent prior to ship-
ment of the apparatus are:
– order confirmation
– original shipping advice note
– any drawings or documents referring to spe-
cial configurations/conditions.
Shock indicator
A Trademark
B Type of apparatus
C Serial number
D Characteristics of the
apparatus
E Characteristics of the
control auxiliaries
F Reference standards
Fig. 1
2. Checking on receipt
During handling, take great care not
to stress the insulating parts of the
apparatus and the terminals of the
contactor.
Any operation carried out on the
contactor must be done without the
presence of voltage and with the main
protection device open: danger of
electrocution and/or severe burns.
Make sure that operations are carried
out with the main and auxiliary power
off.
On receipt, immediately check integrity of the
packing and the colour of the “SHOCKWATCH”
indicator (Fig. 1) placed on it.
If the “SHOCKWATCH” impact indicator is
WHITE, it means that the packing has not re-
ceived any notable shocks during transport.
Open the packing, remove the contactor as in-
dicated below, and check the state of the ap-
paratusand its correspondence with thename-
plate data (see fig. 2) with what is specified in
the accompanying shipping note and in the or-
der confirmation sent by ABB.
Ifthe“SHOCKWATCH”impactindicator is RED,
follow the instructions indicated on the plate.
Openingthe packingdoes not damage its com-
ponents and it can therefore be re-instated us-
ing the original material.
The contactor is shipped in special packing, in
the open position.
Each piece of apparatus is protected by a plas-
tic cover to prevent any infiltration of water dur-
ing the loading and unloading stages and to
keep the dust off during storage.
To remove the contactor from the packing, pro-
ceed as follows:
– open the plastic bag
– remove the contactor, avoiding any stress to
the functional insulating parts and the termi-
nals of the apparatus.
– use the special lifting plates for the withdraw-
able version
– check the ratingplate characteristicsto make
sure that the performances are suitable for
the destined application and that they are
those indicated in the order confirmation.
CONTACTOR IEC 60470
VSC/P ... ... ... CEI 17-1
SN 1VC1 ... ... ... PR. YEAR ......
Ue SERVICE VOLTAGE ... kV
Ie SERVICE CURRENT (AC4) ... A
Ui RATED INSULATION VOLTAGE ... kV
Ith RATED NORMAL CURRENT ... A
fr RATED FREQUENCY ... Hz
ELECTRIC DIAGRAM 1VCD ... ... ... ... (.. .. ..)
FIG. ... ... ...
AUXILIARY VOLTAGE ... ...
... ...
-RL2
Made by ABB

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Fig. 2
3. Handling
The contactor can be lifted using a lifting truck
or a fork-lift truck.
The following precautions must be taken dur-
ing contactor handling:
1. Keep the contactor in the upright position.
2. Make sure that the load is balanced on the
truck or on the transport plate/pallet.
3. Interpose protective material between the
contactor and the truck to avoid any dam-
age or scratches.
4. Fix the contactor onto the truck or onto the
transport plate/pallet to prevent it moving or
tilting over.
3.1. Handling using a lifting or fork-lift truck.
5. Avoid excessive speed, sudden starts and
stops or sharp changes in direction during
contactor handling.
6. Only lift the contactor enough to avoid any
obstacles on the floor.
7. Take care to avoid any impacts with struc-
tures, other apparatus or with personnel
when handling the contactor.
8. Never lift a contactor over an area where
there are people.
9. During handling of the apparatus, do not
stressthe insulating parts and thecontactor
terminals.

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3.2. Handling and lifting using a crane for withdrawable contactors
– Insert the lifting plates
– Lift
– After the unpacking and lifting operations, remove the lifting accessories.
Removal of the contactor from the packing and dismantling the lifting tools.
4. Storage
When a period of storage is foreseen, the origi-
nal packing must be put back. Store the
contactor in a dry dust-free area.It must not be
left outside or in adverse micro-climatic condi-
tions:if it is left without protection, rust and de-
terioration of the insulation can occur.
Insert special hygroscopic packets inside the
packing, with at least one standard packet per
piece of apparatus. Replace the packets ap-
proximately every 6 months.
Should the original packing no longer be avail-
able and immediate installation is not possible,
store in a covered, well-ventilated, dry, dust-
free, non-corrosive ambient, with a dry atmo-
sphere,awayfrom anyflammablematerials and
at a temperature between –5 °C and +40 °C.
In any case, avoid any accidental impacts or
positioning which stresses the structure of the
apparatus.
Fig. 3

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5.3. Normal conditions
Follow the recommendations in the IEC 60694
and 60470 Standards. In more detail:
Ambient temperature
Maximum + 40 °C
Average maximum over 24 hours + 35 °C
Minimum (according to class – 5), – 5 °C
apparatus for indoor installation
Humidity
Theaveragevalueofthe relativehumidity,mea-
sured for a period longer than 24 hours, must
not exceed 95%.
The average value of the water vapour pres-
sure, measured for a period longer than 24
hours, must not exceed 2.2 kPa.
Theaveragevalueofthe relativehumidity,mea-
sured for a period longer than 1 month, must
not exceed 90%.
The average value of the water vapour pres-
sure, measured for a period longer than 1
month, must not exceed 1.8 kPa
Altitude
< 1000 m above sea level.
5.4. Special conditions
Installations above 1000 m a.s.l.
Possible within the limits allowed by reduction
of the dielectric resistance of air.
Climate - Increase in temperature
In order to avoid the risk of corrosion or other
damagein areas withhigh humidityand/or rapid
large fluctuations in temperature, take appro-
priate measures (for example, using suitable
electric heaters) to prevent any condensation
phenomena.
For special installation requirements or other
operating conditions, please contact ABB.
5. Installation
5.1. General
Correct installation is of primary importance.
The manufacturer’s instructions must be care-
fully studied and followed.It is good practice to
use gloves for handling the pieces during in-
stallation.
The areas involved by the passage of
power conductors or conductors of
the auxiliary circuits must be pro-
tected against access of any animals
which might cause damage or disser-
vices.
The contactor enclosure must be installed in a
clean, dry and heated place with good ventila-
tion. It must be easily accessible for cleaning
and inspection, and must be levelled, placed
on the supporting foundations and securely
fixed into position.
When the contactor is connected to a capaci-
tive load, make sure that there is a heating ele-
ment to keep the humidity down and of suit-
able size for the compartment where the
contactor is installed. The contactor must al-
ways be installed associated with a suitable
protection device (e.g.: fuses).
The fixed version of theV-ContactVSC
contactors must be installed by the
customer so as to guarantee a mini-
mum degree of protection of IP2X.
5.2. Installation and operating condi-
tions
Thefollowing Standardsmustbe takenintopar-
ticularconsiderationduringinstallation andser-
vice:
– IEC60694/DIN VDE 0101
– VDE 0105: Operation of electrical plants
– DIN VDE 0141: Earthing systems for electri-
calinstallations withrated voltagehigher than
1 kV
– Allthe accident preventionregulationsin force
in the relative countries.
!
!

13
VSC7
VSC12
5.5. Overall dimensions
5.5.1.VSC fixed contactor
For the overall dimensions and distances between fixing holes, refer to figure 4a.
In any case, avoid stressing the supporting structure of the contactor: if necessary, arrange slots
in the fixing area to facilitate correct positioning of the apparatus.
The assembly positions can be selected between the two shown in figure 4b.
Fig. 4a

14
AB
VSC/P 7 -VSC/P 12
Installation of fixed contactors
The contactor keeps its performances in the installation positions indicated:
A) floor-mounted with moving contacts at the bottom
B) wall-mounted with horizontal moving contacts and terminals at the bottom.
Fig. 4b
5.5.2. VSC/P withdrawable contactors
Fig. 5

15
!
5.6. Assembly and making the connections
5.6.1. Fixed contactors
WARNING
Dangerous voltages. Risk of death, serious injury to people, damage to
the apparatus or other objects.
Togliere l’alimentazione, mettere a terra e in sicurezza tutte le fonti di potenza
e di tensione di controllo prima di iniziare i lavori su questo o qualsiasi
apparecchio elettrico.L’installazione deve essere effettuata solo da personale
qualificato.
– Prepare special pole insulators, near the ter-
minals of the contactor, sized according to
the electrodynamic forces deriving from the
short-circuit current of the installation and
avoid stressing the connections laterally.
Surface treatment of the connections
The connections can either be made of bare
copper or bare aluminium. In any case, it is al-
ways advisable to silver-plate the contact sur-
faces.The surface treatment must have a con-
stant and even thickness.
Assembly procedures for fixed contactors
– Check that the contact surfaces of the con-
nections are flat, and are free of any burrs,
traces of oxidation or deformation caused by
drilling or impacts received.
– Carryoutthe operationsindicatedon thecon-
tact surface of the conductor (silver-plated
copper):
- clean with a rough dry cloth
- only in the case of obstinate traces of oxi-
dation, clean with a very fine grain emery
cloth taking care not to remove the surface
layer
- if necessary, restore the surface treatment
(consult ABB)
- put the connections in contact with the
contactor terminals, taking care to avoid
mechanicalstresses produced,forexample,
by the conductor busbars on the terminals
themselves.
Introduction
Before carrying out any installation operations:
• Test all the power terminalsto checkthatthey
are not supplied with voltage. Only use high
voltage testing equipment approved for
checking the voltage on the power terminals.
Do not attempt to measure the high volt-
age (above 600 volt) with a volt-ohm/meter.
• Check all the control and secondary circuit
terminals with a voltmeter to ensure that all
the control and secondary input voltage
sources have been turned off.
• Connect the safety earthing to the power ter-
minals after having turned the power supply
to the system off and before working on the
apparatus.
• Carry out all the operations for turning off the
voltage and earthing according to the estab-
lished safety procedures.
Power circuit
General precautions
– Check that the connections of the fixed
contactoror the isolating contacts of the with-
drawable contactor are clean and free of any
deformation caused by shocks received dur-
ing transport or storage in the warehouse.
– Select the cross-section of the conductors
accordingtothe servicecurrentand the short-
circuit current of the installation.
-

16
– Interpose a spring and a flat washer between
the head of the bolt and the connection.
– The use of bolts according to DIN class 8.8
Standards is recommended, also referring to
what is indicated in the table.
– In the case of cable connections, strictly fol-
low the manufacturer’s instructions for mak-
ing the terminals.
Bolt Recommended tightening torque (1)
Without lubricant
M6 10.5 Nm
M8 26 Nm
M10 50 Nm
M12 86 Nm
(1) The nominal tightening torque is based on a friction
coefficient of the thread of 0.14 (distributed value the
thread is subjected to which, in some cases, is not neg-
ligible).
Take into account the deviations from the general Stan-
dards table (for example, for contact systems or termi-
nals) as foreseen in the specific technical documenta-
tion.
The thread and surfaces in contact with the heads of
bolts must be slightly oiled or greased, so as to obtain
a correct nominal tightening torque.
Connection to be made by the customer (*)
Pins KM1-1 and KM1-2 must always be supplied, both in the SCO and DCO version (also see
par. 5.8.).The polarity is not important since the internal circuits take both AC or DC signals. For
further details, consult the electric circuit diagram enclosed with the apparatus.
N. of pin Connections Meaning of each pin
KM1-1 Auxiliary power supply Auxiliary power supply AC or DC (pole 1)
KM1-2 Auxiliary power supply Auxiliary power supply AC or DC (pole 2)
KM1-3 Binary output n° 1 Indication of Unit ready (pole 1)
KM1-4 Binary output n° 1 Indication of Unit ready (pole 2)
KM1-5 Binary input n° 1 Protection trip (pole 2)
KM1-6 Binary input n° 1 Protection trip (pole 1)
KM1-7 Binary input n° 2 Closing (pole 1)
KM1-8 Binary input n° 2 Closing (pole 2)
KM1-9 Binary input n° 3 Opening (pole 1)
KM1-10 Binary input n° 3 Opening (pole 2)
KM1-11 Binary input n° 3 Undervoltage (pole 1)
KM1-12 Binary input n° 3 Undervoltage (pole 2)
Earthing
For the fixed version contactor, carry out
earthing by means of the special hole marked
with the relative symbol. Clean and degrease
the area around the screw to a diameter of
about 30 mm and, on completion of assembly,
cover the joint again with Vaseline grease.
Use a conductor (busbar or cord) with a cross-
section conforming to the Standards in force.
Connection of the auxiliary circuits
The cables to be used for connection of the
auxiliary circuits must have a rated voltage Uo/
U of 450/750 V and be insulated for 3 kV test.
Note: before carrying out the test, disconnect the earthing
connection of the electronic feeder.
Also remember that the auxiliary circuits must be checked
at the maximum voltage of 2 kV in accordance with what is
prescribed in the Standards.
The cross-section of the connection cables
must not be less than 1.5 mm2.
Connection of the contactor auxiliary circuits
must be made by means of the socket with ter-
minalboxmountedon the front of theelectronic
card.
Outside, the wires must run through metallic
pipes or ducts suitably earthed.
(*) Only forfixed contactors.
The withdrawable con-
tactors are cabled in the
factory.

17
KM1-1
KM1-2
KM1-3
KM1-4
KM1-5
KM1-6 KM1-7
KM1-8
KM1-9
KM1-10
KM1-11
KM1-12
Fig. 6
Checks
After the above-mentioned operations, carry out the following checks:
– check that the connections do not exert any force on the terminals
– check tightness of the connections.
Fig. 7

18
Heating
Refer to technical catalogue 1VCP000165 for
the rated capacity of the contactors, bearing in
mind that apparatus heating is affected by the
following variables:
• layout of the enclosures in the switchgear de-
signed by the customer;
• degree of protection (ventilation slats);
• current density of the power supply busbars
(busbar duct - branches);
• ambient temperature.
For any needs, please contact ABB Service.
Reference Standards
The enclosures and contactors comply with the
following Standards:
– CEI 17/6 (1993) (where applicable)
– ICE 62271-200 (2003) (where applicable)
– CEI EN 60694 (1997) (where applicable)
– IEC 60694 (2002) (where applicable)
– IEC 60470 (2000) (where applicable)
Withdrawable VSC/P contactors
Thecontactors are used forratedvoltagesfrom
7.2 to 12 kV, rated normal currents up to 400 A
and fault levels up to 1000 MVA (with suitable
protection fuses in series with the contactor).
The VSC/P contactor is made up of:
– athree-pole contactor withSCO orDCO func-
tion
– mechanical signalling of open/closed
– twopairsof auxiliarycontactssignalling open/
closed
– multi-voltage feeder:
• type 1: from 24 to 60 Vdc
• type 2: from 100 to 135 Vdc/Vac- 50-60 Hz
• type 3: from 220 to 250 Vdc/Vac- 50-60 Hz
– a truck on which the supporting structure of
the contactor is fixed, consisting of two sup-
ports,closedat the front bytheprotection with
characteristics nameplate.
Inthe toppart ofthe protection there are strik-
ers (30a) and (30b) for actuating the enclo-
sure contacts to signal protection connected/
isolated.
The pin (34) for locking contactor racking-in
with the earthing switch closed on the enclo-
sure, comes out on the right side of the truck
(28).
5.6.2. Withdrawable contactors and enclo-
sures
The withdrawable contactors are used in the
UniGear ZS1 type switchgear and in the
PowerCube enclosures.
Appropriately fixed together in the configura-
tions defined by the customer, the enclosures
build up medium voltage switchgear consisting
of various units.
Rules for designing the switchgear
Arc proof
The ABB enclosures are supplied with a rein-
forced door, suitable for making arc proof
switchgear.
•The reinforced enclosure alone can-
not guarantee arc proofing of the
switchgear designed by the custom-
er. To guarantee this, some repre-
sentative configurations, selected
by the customer,must be subjected
to the tests according to the pre-
scriptions indicated in the IEC
62271-200 Standards.
• For UniGear ZS1 type switchgear,all
the door knurls must be tightened
to guarantee arc proofing.
Degree of protection
Limited to the front part, the ABB enclosures
guarantee the following degree of protection:
• IP30 on the external housing;
• IP20inside the switchgear with thedoor open.
Special versions up to IP41.
The reinforced enclosure alone sup-
plied by ABB cannot guarantee the de-
gree of protection of the switchgear
designed by the customer.It must un-
dergo the tests according to the pre-
scription indicated in the IEC62271-
200 Standards.
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