Schaltbau C320 Series User manual

33
Contactors
C320 series
1 pole
AC and bi-directional DC
NO contactors for 1,000 A
Installation and
maintenance instructions
Manual C320-M.en

22021-07-15 / V1.0
Contactors C320K/C320S – Installation and Maintenance Manual
Document Revision History
Date Rev. version Description Pages
2021-07-15 V1.0 Initial version All
Content
1. Important basic information......................................................................................... 4
1.1 Legal notes .............................................................................................................................. 4
1.2 Conventions for this manual............................................................................................. 4
2. General and safety information.................................................................................... 4
2.1 Observing the manual......................................................................................................... 4
2.2 Duties of the operating company................................................................................... 5
2.3 Intended use........................................................................................................................... 5
2.4 Ambient conditions.............................................................................................................. 5
3. Hazards and safety precautions.................................................................................... 6
3.1 Electrical hazards................................................................................................................... 6
3.2 Other hazards ......................................................................................................................... 6
3.3 Measures for avoiding damage and malfunctions ................................................... 7
4. Product information........................................................................................................ 8
4.1 C320 – 1 pole bi-directional DC NOcontactors ......................................................... 8
4.2 Technical information and material properties.......................................................... 8
4.3 Overview .................................................................................................................................. 9
C320K/1000............................................................................................................................. 9
C320S/1000 ...........................................................................................................................10
5. Storage.............................................................................................................................11
6. Unpacking.......................................................................................................................11
6.1 Unpacking the device........................................................................................................11
6.2 Check parts for transport damage................................................................................11
7. Installation ......................................................................................................................12
7.1 Mounting ...............................................................................................................................12
Dimensions/interfaces and further technical specications...............................12
Preparatory measures........................................................................................................12
Mounting holes....................................................................................................................12
Mounting positions............................................................................................................13
Required minimum clearances ......................................................................................13
Ventilation requirements .................................................................................................14
Safety.......................................................................................................................................14
Tools required.......................................................................................................................14
Installing the contactor.....................................................................................................14

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7.2 Electrical connection .........................................................................................................15
Electrical data and other technical specications...................................................15
Preparatory measures........................................................................................................15
Safety.......................................................................................................................................16
Tools required.......................................................................................................................16
Connecting the S870 auxiliary switches.....................................................................17
Connecting the coil............................................................................................................18
Connecting the main contacts.......................................................................................19
7.3 Checks .....................................................................................................................................21
8. Maintenance...................................................................................................................22
8.1 Safety.......................................................................................................................................22
8.2 Preventive maintenance...................................................................................................22
Intervals for regular tests/checks ..................................................................................22
Regular tests/checks ..........................................................................................................23
Checking the main contacts ...........................................................................................24
8.3 Corrective maintenance ...................................................................................................25
Replacing the S870 auxiliary switches.........................................................................25
9. Spare parts......................................................................................................................27
10. Technical data.................................................................................................................27
11. Disposal ...........................................................................................................................27

42021-07-15 / V1.0
Important basic information
Contactors C320K/C320S – Installation and Maintenance Manual
1. Important basic information
1.1 Legal notes
Without prior written consent of SCHALTBAU GmbH,
this manual is not allowed to be electronically or me-
chanically reproduced – as a whole or in parts – be dis-
tributed, changed, transmitted, translated into another
language or used in any other way.
SCHALTBAUGmbH cannot be held liable for damage
caused by non- or only partial observation of the man-
ual.
1.2 Conventions for this manual
This manual describes the installation and maintenance
of the contactors.
Cross references are presented in bold italics.
To highlight particularly important safety instructions
and other information, the following symbols are used
in this manual:
DANGER
Indicates a directly threatening dangerous situation.
Death or severe injuries will result if it is not prevent-
ed.
WARNING
Indicates a possibly dangerous situation. Death or
severe injuries may result if it is not prevented.
CAUTION
Indicates a possibly dangerous situation. Medium or
minor injuries may result if it is not prevented.
ATTENTION
Indicates a possibly detrimental situation. If it is not
prevented, assemblies, the system or property in its
surroundings could be damaged.
Indicates technical features and methods
to simplify working or indicates informa-
tion of particular importance.
This manual describes single pole contactors of the fol-
lowing types:
-C320K/1000
-C320S/1000
2. General and safety information
The contactors dealt with in this document are intend-
ed for use with electrical systems for special applica-
tions. They are designed and tested in compliance with
generally accepted codes of practice. However, improp-
er use, operation, handling, maintenance of or tamper-
ing with electric equipment can cause serious or fatal
injury to the user or others, and the appliance or other
property can be damaged. Consequently, the opera-
tion, maintenance and installation instructions for the
contactors must be strictly followed.
If anything is not clear, clarication must be sought
with any queries stating the device type and the serial
number.
Only authorised and trained personnel are allowed to
plan and carry out all mechanical and electrical instal-
lations, transport, commissioning, as well as mainte-
nance and repair work.
This applies to the observation of the general installa-
tion and safety regulations for electrical systems as well
as the proper use of tools approved for this purpose.
Electrical equipment requires protection from moisture
and dust during installation, operation and storage.
2.1 Observing the manual
X All personnel must read and understand the in-
structions in this manual and adhere to them
when working with the device.
X Always adhere strictly to all safety instructions!

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General and safety information
2.2 Duties of the operating company
X Observe all applicable national regulations, all
safety, accident prevention and environmental
protection regulations as well as the recognised
technical rules for safe and correct working.
X Regularly check all tted protection and safety
equipment for correct function.
X Work on electrical equipment must only be car-
ried out by a qualied electrician or by instructed
persons under the supervision and control of a
qualied electrician in accordance with electrical
regulations.
X A specialist is someone who, on the basis of their
technical training, knowledge and experience as
well as knowledge of the relevant regulations,
is able to assess the work assigned to them and
identify possible dangers.
X Work on the contactors must only be carried out
by personnel who meet the requirements set out
in this manual.
X Personnel must be clearly informed about who is
responsible for the maintenance of the contactors.
X Always perform complete checks after any instal-
lation work and/or after any other conversions, al-
terations or maintenance, in accordance with the
following standards:
-EN/IEC 60077-2
-EN/IEC 60947-4-1
2.3 Intended use
X The contactors have been designed and tested ac-
cording to national and international standards.
Due to their unique features they can also be used
in a wide range of industrial applications.
X The contactors must only be used under operat-
ing conditions according to the technical speci-
cations and the instructions in this manual.
X None of the conditions of use, such as voltages,
currents or ambient conditions, dened in the cor-
responding technical data sheets or in our C320
catalogue may be overridden. The C320 catalogue
is available under:
https://www.schaltbau.com/media/C320_en.pdf
X The contactors may only be used when all protec-
tive devices are present, have been correctly in-
stalled and are fully operational.
X Contactors may not be used without other safety
precautions in potentially explosive atmospheres
and/or in aggressive media.
X The device contains unprotected live parts.
X The prescribed clearances relative to other live
parts or earth and other parts must be complied
with as well as the safety regulations of the appli-
cable standards.
X Switching at close to the maximum breaking ca-
pacity may require increased minimum clearanc-
es! Do not hesitate to ask our advice in respect of
any dimensioning.
X Coil suppression for reducing surges when the coil
is switched o is optimally attuned to the contac-
tor‘s switching behaviour. The existing opening
characteristic must not be negatively inuenced
by parallel connection with an external diode.
X Improper handling of the contactors, e.g. impacts
on the oor, may result in breakage, cracks or de-
formation. Always handle the device with care.
X Only use the contactors for the specied applica-
tion and only with original parts. Any other usage
of or tampering with the contactors is considered
contrary to their intended use. No liability is as-
sumed for damages and accidents caused due to
non-compliance with the instructions in this man-
ual or improper use of the contactors.
2.4 Ambient conditions
ATTENTION
The contactors have been design for specic ambi-
ent conditions.
X Only operate the contactors in ambient condi-
tions, such as temperature ranges, degree of
soiling, etc., as dened in the corresponding
data sheets and in our catalogue C320. The
C320 catalogue is available under:
https://www.schaltbau.com/media/C320_en.pdf

62021-07-15 / V1.0
Hazards and safety precautions
Contactors C320K/C320S – Installation and Maintenance Manual
3. Hazards and safety precautions
3.1 Electrical hazards
DANGER
The contactors are used for high voltage switching. Contact with live electrical parts can result in
serious injuries or even death!
Live parts are all metal parts belonging directly to one of the circuits or wires connecting to them.
All other visible metal parts and wiring may also be live if a fault exists.
Before starting any work on the contactors, always comply with the following safety rules:
X Disconnect on all sides
X Secure to prevent switching back on
X Clearly identify the working area
X Check that a voltage-free state exists
X Earth and short circuit; this includes discharging any capacitors in the main circuit
X Besides the main power circuits, also disconnect additional and auxiliary circuits
X Cover or insulate adjacent live parts
X The presence of a voltage-free state can only be clearly identied by a qualied electrician.
X When the work has been concluded, follow the procedure in reverse.
3.2 Other hazards
WARNING
Contactors must only be used for the purposes specied in the specications and data sheets. Incor-
rect use can cause accidents and severe personal injury.
X The manufacturer will not be responsible for accidents arising from improper use of the product.
CAUTION
During continuous operation the contactors may become hot. Risk of burns!
X Before beginning any checks or maintenance on the contactors ensure that the heated com-
ponents have cooled down.
CAUTION
The contactors contain sharp-edged parts. Risk of injuries!
X Use appropriate tools for installation and maintenance work on the contactors.
X Wear safety gloves when handling sharp-edged components.

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Hazards and safety precautions
3.3 Measures for avoiding damage and malfunctions
ATTENTION
Aggressive liquids may damage the contactors.
X Ensure the contactors do not come into contact with corrosive liquids.
ATTENTION
Improper handling of the contactors, e.g. dropping on the oor, can result in breaks, cracks and deformation.
X Ensure the contactors are always handled correctly.
X Do not throw the contactors on the oor.
X At regular intervals perform a visual check of the contactors for possible damage.
X Immediately replace any damaged parts.
ATTENTION
Depending on the product type, contactors can contain permanent magnets. Such magnets can attract ferro-
magnetic parts resulting in damage to the contactors.
X Ensure that the contactors are installed in a location where it is not possible for them to attract any ferro-
magnetic parts.
ATTENTION
Depending on the product type, contactors can contain permanent magnets. These permanent magnets can
destroy the data on the magnetic strips of credit or similar cards.
X Keep credit or similar cards away from the contactors.
ATTENTION
During switching o, strong electromagnetic elds are generated in the vicinity of the contactors. These may
inuence other components close to the contactors.
X Make sure that the contactors are installed in a location where no other components are aected.
ATTENTION
In the case of damage, wear and/or soiling of the contactors - in the form of a partial break, sharp edges and
discoloured surfaces - the functional reliability of the contactors is no longer ensured.
X Visually inspect the contactors regularly to detect wear and soiling.
X Replace damaged parts immediately.
X Immediately remove any soiling without leaving any residues.
X Immediately replace any parts with persistent soiling.
ATTENTION
Detent-edged rings and detent-edged washers have a limited life time. After screws secured with detent-edged
rings or detent-edged washers have been undone three times, the rings or washers must be replaced by new
ones.
X Record the frequency of undoing of the screws in the work log.
X Replace detent-edged rings or detent-edged washers with new ones after the screws have been undone
three times.

82021-07-15 / V1.0
Product information
Contactors C320K/C320S – Installation and Maintenance Manual
4. Product information
4.1 C320 – 1 pole bi-directional DC
NOcontactors
The C320 is a single-pole bi-directional DC contactor in
the power class up to 1,000 A. It ensures that high loads
are switch-o safely and provides reliable protection in
the event of a fault in the system. Typical applications
are the use as main contactor in battery management
systems of high-voltage vehicle batteries, in charging
stations for e-mobility, in battery test benches but also
in the DC circuits of inverters of photovoltaic systems.
A very ecient ceramic arc chamber, double-break
contacts an high breaking capacity are important fea-
tures of the new contactor.
X Compact dimensions – high rated insulation volt-
age Uiup to 1,800volts
X High making capacity Icm of up to 3,000amps and
an excellent breaking capacity
X High thermal continuous current Ith of up to
1,000amps and high rated short-time withstand
current Icw up to 4,500amps
X Full bidirectionality – safe disconnection of high
power independent of the current ow direction
X 4 auxiliary switches, 2 of them with mirror contact
function for diagnosis and switching status moni-
toring
X Low energy consumption and low heating thanks
to sophisticated coil saving circuit
4.2 Technical information and material
properties
For technical information and material properties, refer
to the corresponding data sheets and to our C320 cata-
logue. The C320 catalogue is available under:
https://www.schaltbau.com/media/C320_en.pdf

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Product information
4.3 Overview
C320K/1000
B
E
FG
A
B
E
C
C
C
E
E
C
DD
A Arcing chamber
B Main contacts: connection M8, torque 10...12Nm
C Base plate with 4 fastening holes for M5 screws, torque 2.3...2.7Nm
D Fixing lugs for bundling and xing control wires with cable ties
E Auxiliary switch S870 W1D1 t, at plug connections 6.3x0.8mm
(dependent on the design, up to 4 auxiliary switches per contactor are possible)
F Economy circuit for coil
G Coil terminal: cage clamp connection

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Product information
Contactors C320K/C320S – Installation and Maintenance Manual
C320S/1000
E
FG
B
E
C
C
C
E
E
C
B
DD
B Main contacts: connection M8, torque 10...12Nm
C Base plate with 4 fastening holes for M5 screws, torque 2.3...2.7Nm
D Fixing lugs for bundling and xing control wires with cable ties
E Auxiliary switch S870 W1D1 t, at plug connections 6.3x0.8mm
(dependent on the design, up to 4 auxiliary switches per contactor are possible)
F Economy circuit for coil
G Coil terminal: cage clamp connection

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Storage
5. Storage
ATTENTION
Moisture and dust can damage the contactors. If the
device is to be stored for a prolonged period of time:
X Store the device in its original packaging,
X Store the device in a dry and dust-free location.
Return shipments
Schaltbau recommends retaining the original packag-
ing for any return shipments.
If the original packaging is not available, care must be
taken to pack the contactor in a way that prevents dam-
age during shipment.
6. Unpacking
6.1 Unpacking the device
X Before opening the packaging, perform a visual
inspection for any signs that could indicate dam-
age having occurred during transport (impacts,
bumps, dropping, etc.).
X If any signs indicate that the contactor has been
subject to excessive impacts do not install it.
6.2 Check parts for transport damage
ATTENTION
If parts are damaged, functional reliability of the con-
tactor has been lost.
X Before installing, check all parts for possible
transport damage.
X Do not install damaged parts.

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Installation
Contactors C320K/C320S – Installation and Maintenance Manual
7. Installation
7.1 Mounting
Dimensions/interfaces and further
technical specications
The dimensions and other technical specications are
given in the respective data sheets or can be found in
our C320 catalogue. The C320 catalogue is available un-
der: https://www.schaltbau.com/media/C320_en.pdf
Preparatory measures
X A suitable mounting plate with 4 mounting holes
in accordance with the following dimensional
drawings (Fig. 1 and Fig. 2) must be provided for
fastening of the contactors.
X The mounting holes can be either:
-threaded holes (for threaded screws)
-or through holes (for threaded screws and nuts)
X Fastening of the contactors on the mounting plate
is performed using four M5 mounting screws.
-The length of the mounting screws must be de-
termined dependent on the structural circum-
stances.
-To secure the mounting screws so that they
do not come loose, appropriate screw locking
elements must be provided. Schaltbau recom-
mends using Schnorr washers (or similar).
-The mounting screws must be equipped with
washers (resting on the device). Installation
without washers is not permitted!
-The mounting screws must be tightened to a
torque of 2.3...2.7Nm (screws of strength class
4.6).
Mounting holes
Ø 5.5 ±0.2
or M5
67.6
99.2
Fig. 1: C320K: Dimensions and layout of mounting holes
Ø 5.5 ±0.2
or M5
67.6
99.2
Fig. 2: C320S: Dimensions and layout of mounting holes

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Installation
Mounting positions
The contactors are designed for horizontal or vertical
mounting. Examples of correct mounting positions are
presented in Fig. 3/A and Fig. 4/A. Incorrect mount-
ing positions are shown in Fig. 3/B and Fig. 4/B. These
mounting positions (B) are not permitted!
AB
AA
B
B
Fig. 3: C320K: Examples of correct mounting positions (A)
and incorrect mounting positions (B).
AB
AA
B
B
Fig. 4: C320S: Examples of correct mounting positions (A)
and incorrect mounting positions (B).
Required minimum clearances
X Switching of high voltage currents produces elec-
tric arcs and it is possible that plasma will escape
from the openings of the arcing chambers. There-
fore, it is extremely important to maintain the
minimum clearances to ground/earth and the bus
bars to avoid ashovers.
Minimum clearances for type C320K contactors
A minimum clearance from magnetic or magnetised
parts is required on all sides and above for type C320K
contactors. See C320 catalogue.
Fig. 5: C320K: Minimum clearance required from magnetic
and earthed components. Clearances see C320 cata-
logue.
Minimum clearances for type C320S contactors
A minimum clearance from magnetic or magnetised
parts is required on all sides and above for type C320S
contactors. See C320 catalogue.
Fig. 6: C320S: Minimum clearance required from magnetic
and earthed components. Clearances see C320 cata-
logue.

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Installation
Contactors C320K/C320S – Installation and Maintenance Manual
Ventilation requirements
X Ensure sucient ventilation in the installation area,
especially when disconnecting heavy loads. This
allows the plasma to be dissipated more quickly to
reduce the risk of ash-overs and corrosion.
Safety
X Installation must be performed by qualied
trained personnel.
ATTENTION
When installing, ensure that no dirt can get into the
contactor as a result of surrounding building activi-
ties.
ATTENTION
Detent-edged rings and detent-edged washers have
a limited life time. After screws secured with detent-
edged rings or detent-edged washers have been
undone three times, the rings or washers must be
replaced by new ones.
X Record the frequency of undoing of the screws
in the work log.
X Replace detent-edged rings or detent-edged
washers with new ones after the screws have
been undone three times.
Tools required
X Socket spanner set, hexagon nuts
X Open-ended spanner set
X Torque wrench
X Hex key set
Installing the contactor
X Ensure that the contact surfaces on the mounting
plate (3) are free from dirt and other contamina-
tion (e.g. metal chips).
X Position the contactor (1) on the mounting plate
(3) which is provided with mounting holes.
ATTENTION
X The mounting screws M5 (2) must be equipped
with washers (resting on the device). Installa-
tion without washers is not permitted!
X Secure the contactor to the mounting ange with
4 mounting screws M5 (2) on the mounting plate
(3).
-In designs with the mounting holes imple-
mented as threaded holes, screw the mounting
screws into the holes directly, not forgetting the
washers.
-In designs with through holes, t the mounting
screws and washers and tighten the screws us-
ing suitable screw locking elements and nuts.
X Thighten the mounting screws (2) to a torque of
2.3...2.7Nm (screws of strength class 4.6).
1
3
24 x M5
2.3...2.7
Nm
Fig. 7: C320K: Installing the contactor on the mounting plate
1
3
24 x M5
2.3...2.7
Nm
Fig. 8: C320S: Installing the contactor on the mounting plate

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Installation
7.2 Electrical connection
Electrical data and other technical
specications
For the power consumption of the magnetic drive sys-
tem and electrical data of the auxiliary switches as well
as other technical specications, refer to the respective
data sheets and to our C320 catalogue. The C320 cata-
logue is available under:
https://www.schaltbau.com/media/C320_en.pdf
Preparatory measures
X Connection of the main power circuit can be im-
plemented with wires or busbars.
X The minimum conductor cross-sections for the
main terminal connection must be observed.
X If connecting wires are used, they must be select-
ed taking into consideration the insulation class
and the ambient conditions.
X The minimum conductor cross-sections for the
connecting wires are given in our C320 catalogue
and must be adhered to.
The C320 catalogue is available under:
https://www.schaltbau.com/media/C320_en.pdf
X The connecting wires of the main power circuit
must be tted with appropriate ring terminals (for
M8 terminal screws).
X Schaltbau recommends Schnorr washers (or simi-
lar) to prevent the terminal screws from coming
loose.
X The main terminal screws must be tightened to a
torque of 10 ... 12 Nm.
X The connections for the auxiliary switches are
made with at plugs. Consequently, the control
wires must be equipped with corresponding at
receptacles 6.3 x 0.8 mm.
X The maximum permissible conductor cross-
section of the auxiliary switch control wires is
1.5mm2/ AWG 16 stranded wire.
X A cage clamp terminal block is provided for the
coil control wires. The control wires for the coil
connection must be stripped accordingly (if nec-
essary, t with appropriate wire end sleeves):
-conductor cross-section
0.5 ... 1.5 mm2with sleeve
0.5 ... 2.5 mm2without sleeve
-stripping length: 8 ... 9 mm
X For the power consumption of the coil drive sys-
tem and the electrical data of the auxiliary switch-
es refer to our catalogues:
-C320 (Catalogue C320 series devices)
-D70 (Catalogue auxiliary switches S870)

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Installation
Contactors C320K/C320S – Installation and Maintenance Manual
Safety
DANGER
The contactors are used for high voltage switching. Contact with live electrical parts can result in
serious injuries or even death!
Live parts are all metal parts belonging directly to one of the circuits or wires connecting to them.
All other visible metal parts and wiring may also be live if a fault exists.
Before starting any work on the contactors, always comply with the following safety rules:
X Disconnect on all sides
X Secure to prevent switching back on
X Clearly identify the working area
X Check that a voltage-free state exists
X Earth and short circuit; this includes discharging any capacitors in the main circuit
X Besides the main power circuits, also disconnect additional and auxiliary circuits
X Cover or insulate adjacent live parts
X The presence of a voltage-free state can only be clearly identied by a qualied electrician.
X When the work has been concluded, follow the procedure in reverse.
ATTENTION
Detent-edged rings and detent-edged washers have
a limited life time. After screws secured with detent-
edged rings or detent-edged washers have been
undone three times, the rings or washers must be
replaced by new ones.
X Record the frequency of undoing of the screws
in the work log.
X Replace detent-edged rings or detent-edged
washers with new ones after the screws have
been undone three times.
Tools required
X Socket spanner set, hexagon nuts
X Open-ended spanner set
X Torque wrench
X Continuity tester
X Cable ties

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2021-07-15 / V1.0 Contactors C320K/C320S – Installation and Maintenance Manual
Installation
Connecting the S870 auxiliary switches
The control wires for the auxiliary switches must be t-
ted with at receptacles (6.3 x 0.8 mm).
ATTENTION
X The maximum permissible conductor cross-
section of the auxiliary contact control wires is
1.5 mm2/ AWG 16 stranded wire.
X Bending of the connections on the auxiliary
switches is not permitted!
X Mechanically secure the control wires to mi-
nimise feedback eects of forces caused by
the wires (e. g. shock, vibrations) acting on the
terminals.
X Route the coil control wires (1) to the auxiliary
switches (2).
X Plug the pre-assembled control wires with the re-
ceptacles (1) to the connections (2) of the auxiliary
switches.
X Check that the control wires of the auxiliary
switches are correctly installed.
X Check the routing of the wiring. Wires must not be
squeezed or bent.
X If applicable bundle and secure the wires using
cable ties. For this purpose, there are xing lugs at
the bottom on both sides of the contactor.
6.3x0.8 mm
1
2
1
1
2
6.3x0.8 mm
Fig. 9: C320K: Connecting the S870 auxiliary switches
6.3x0.8 mm
1
2
1
1
2
6.3x0.8 mm
Fig. 10: C320S: Connecting the S870 auxiliary switches

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Installation
Contactors C320K/C320S – Installation and Maintenance Manual
Connecting the coil
A cage clamp terminal block is provided for the coil
control wires. The control wires for the coil connection
must be stripped accordingly (if necessary, t with ap-
propriate wire end sleeves):
-conductor cross-section
0.5 ... 1.5 mm2with sleeve
0.5 ... 2.5 mm2without sleeve
-stripping length: 8 ... 9 mm
ATTENTION
The value of the overvoltage limitation is part of the
magnetic system and must not be modied and in
particular not be short-circuited (e.g. by an external
diode).
X Make sure that no such diode is used in your
control circuit.
ATTENTION
X Mechanically secure the control wires to mi-
nimise feedback eects of forces caused by
the wires (e. g. shock, vibrations) acting on the
terminals.
X Route the coil control wires (1) to the cage clamp
terminal block (2).
X Connect the control wires (1). Make sure that the
polarity (+/-) is correct.
-Wrong polarity will not damage the contactor.
-Due to wrong polarity the contactor will not
work properly.
X Check that the coil control wires are correctly in-
stalled.
X Check the routing of the wiring. Wires must not be
squeezed or bent.
X If applicable bundle and secure the wires using
cable ties. For this purpose, there are xing lugs at
the bottom on both sides of the contactor.
1
2
Fig. 11: C320K: Connecting the coil
1
2
Fig. 12: C320S: Connecting the coil

19
2021-07-15 / V1.0 Contactors C320K/C320S – Installation and Maintenance Manual
Installation
Connecting the main contacts
ATTENTION
Ensure that the connection points for the main con-
tacts are free from corrosion.
Connection example using wires
The connecting wires of the main power circuit must be
tted with appropriate ring terminals (for M8 terminal
screws).
Examples for the connection with wires are shown in
Fig. 13 and Fig. 14.
X Route the pre-assembled connecting wires to
both main contacts (4).
X Screw the 4 ring terminals (3) in place from above
using the terminal screws (1), nuts (5) and suitable
screw locking elements (2).
-Schaltbau recommends using Schnorr washers
(or similar).
X Tighten the terminal screws (1) to a torque of
10...12 Nm.
2
1
2
4
5
1
2
3
4
5
2
3
10...12
Nm
10...12
Nm
Fig. 13: C 320K: Connecting the main contacts (connection
example using wires)
2
4
5
2
3
2
1
1
4
5
2
10...12
Nm
10...12
Nm
3
Fig. 14: C 320S: Connecting the main contacts (connection
example using wires)

20 2021-07-15 / V1.0
Installation
Contactors C320K/C320S – Installation and Maintenance Manual
Connection example using busbars
As an alternative to connection using wires, the main
power circuit can be connected with busbars.
Examples for the connection with busbars are shown in
Fig. 15 and Fig. 16.
X Route the busbars (3) to both main contacts (4).
X Screw the busbars (3) to the main contacts (4) us-
ing the terminal screws (1), nuts (5) and suitable
screw locking elements (2).
-Schaltbau recommends using Schnorr washers
(or similar).
X Tighten the terminal screws (1) to a torque of
10...12 Nm.
4
4
1
2
3
2
5
2
5
3
1
2
10...12
Nm
10...12
Nm
Fig. 15: C 320K: Connecting the main contacts (connection
example using busbars)
4
4
11
2
3
2
5
2
5
3
10...12
Nm
10...12
Nm
2
Fig. 16: C 320S: Connecting the main contacts (connection
example using busbars)