Schaltbau CT1115/04 User manual

3
Inhalt
Rundsteckverbinder für Spezialanwendungen, Baureihe SB 2
Besondere Merkmale 2
Applikationen 2
Baureihenübersicht 2
Kompetenz 2
Normen 2
Technische Daten 3
Bestellschlüssel 4
5-polig + PE Flanschstecker, Kabeldose 4
6-polig Flanschdose, Kabelstecker 5
14-polig Flanschstecker, Kabeldose 5
Montage 6
Werkzeuge Ausdrückwerkzeuge AWZ-A und AWZ-C/H, Crimpzange CWZ-600 6
Montagebohrungen 6
Kontakte Stecker: Crimpkontakte, Dosen: Lötkontakte 7
Deratingkurven 7
Sicherheitshinweise 7
ContactorsContactors
CT1115/04, CT1130/04 series
Single Pole NO
Power Contactors
for AC and DC
Manual C20/04-M.en

Page 2/25 Rev.1.1 User Manual, Power contactors, series CT1115/04 and CT1130/04
Revision History:
Rev.Level
Date
Page
Description
Name
1.1
26.10.2012
21
Part number of glue for ceramic protection insert
changed from 13600310 to 13650290
Neuwieser
1.2
24.10.2017
10
Functional decription, diagram of switching status,
page 10
Kapfer

Page 3/25 Rev.1.1 User Manual, Power contactors, series CT1115/04 and CT1130/04
Conventions for this
Manual
To highlight particularly important instructions, the following symbols are
used in this handbook.
General legal notice
CT1000 contactors must only be used under operating conditions according to the technical specification and
the instructions in this manual.
CT1000 contactors must only be used when all protective devices are present, have been installed properly
and are fully operational.
CT1000 contactors must not be converted or otherwise modified without prior consent of SCHALTBAU GmbH.
Violations against this will result in the exclusion of liability on the part of the manufacturer.
We reserve the right to make technical alterations without prior notice.
For updated product information visit www.schaltbau-gmbh.com.

Furthermore, we refer to our “General Terms and Conditions of Sale (GCS) for Goods and Services”.
Copyright notice
Without prior written consent of Schaltbau GmbH, the operating instructions are not allowed to be electronically or
mechanically reproduced –as a whole or in parts –be distributed, changed, transmitted, translated into another
language or used in any other way.
NOTICE refers to technical features and methods aimed at
facilitating work or to particularly important information.
DANGER refers to processes/operations which have to be
followed exactly in order to avoid personal injuries.
CAUTION refers to processes/operations which must be fol-
lowed to avoid damaging structural components, the system
or other user materials.
WARNING refers to hazardous electrical voltages.

Page 4/25 Rev.1.1 User Manual, Power contactors, series CT1115/04 and CT1130/04
Table of Contents
Introduction ....................................................................................................................................................5
Safety information..........................................................................................................................................6
Electrical hazards.....................................................................................................................................6
Safety notices...........................................................................................................................................6
General application notes.........................................................................................................................6
Technical data................................................................................................................................................7
Applied standards..........................................................................................................................................7
Description .....................................................................................................................................................8
Lower Module...........................................................................................................................................8
Upper Module...........................................................................................................................................9
Functional description ............................................................................................................................10
Order code..............................................................................................................................................11
Storage..........................................................................................................................................................12
Storage...................................................................................................................................................12
Return shipments ...................................................................................................................................12
Installation....................................................................................................................................................12
Unpacking and handling.........................................................................................................................12
Operating position..................................................................................................................................13
Mechanical requirements.......................................................................................................................13
Electrical requirements...........................................................................................................................14
Mechanical installation...........................................................................................................................14
Electrical installation of the auxiliary switches........................................................................................15
Electrical installation of the magnetic drive............................................................................................15
Mounting of the Upper Module...............................................................................................................16
Electrical installation of the main circuit .................................................................................................16
Electrical installation of the earth terminal..............................................................................................17
Commissioning............................................................................................................................................17
Maintenance .................................................................................................................................................18
Recommended regular service intervals................................................................................................18
Unscheduled service intervals................................................................................................................18
Inspection activities ................................................................................................................................18
Spare parts, replacement of parts..........................................................................................................19

Page 5/25 Rev.1.1 User Manual, Power contactors, series CT1115/04 and CT1130/04
Introduction
CT1000 contactors are air switching components with arc breaking in ce-
ramic. They use a highly sophisticated principle of arc control, combining
the permanent-magnetic and electro-magnetic blow-out technique.
This allows practically unrestricted operation for all AC and DC voltages
and currents within the technical specification.
CT1015 contactors are designed for nominal voltages of 1,500 V.
CT1030 contactors are designed for nominal voltages of 3,000 V.
Due to the very high rated insulation voltage CT1030 contactors
can be used for peak voltages up to 5,000 V.
This manual refers to single pole contactors with a conventional
thermal current of 400 A. For single contactors for 800 A refer to
manual C20/08-M.
CT1000 contactors provide excellent switching performance from very
small up to heavy loads.
CT1000 contactors are available for vertical and horizontal mounting.
CT1000 contactors have been designed and tested according to National
and International Railway Standards. Due to their unique features they
can also be used in a variety of industrial applications.
CT1000 contactors offer the following design-related advantages:
Compact, rugged design
2 voltage levels, several current levels
Double-break contacts, cadmium-free contact tips
1-, 2- (and 3-) pole versions
Easy maintenance:
oEasy inspection of main contact tips, easy replacement of
main contacts
oEasy replacement of arc chamber (upper module)
Drive system suitable for standard railway supply voltages and
tolerances. No economy circuit required for standard versions.
Drive systems for industrial applications on demand.
Insulation coordination:
oFunctional insulation for main circuit
oBasic insulation between main circuit and protective earth
oReinforced insulation between main circuit and control
circuit / main circuit and auxiliary circuits
Long mechanical and electrical life
No regular maintenance required. Inspection intervals and exchange of
wear parts depending on specific application.

Page 6/25 Rev.1.1 User Manual, Power contactors, series CT1115/04 and CT1130/04
Safety information
Electrical hazards
Safety notices
General application
notes
Before carrying out any inspection and maintenance work on
CT1000 contactors, the contactors must be de-energized and
in addition life wires made safe by earthing. If the environ-
ment has no disconnecting and earthing device, other suita-
ble measures must be used to ensure that no voltage is pre-
sent. Please make sure that any capacitors in the main circuit
are discharged before touching main wires. We recommend
securing the supply lines to prevent switching back on.
The 2 black protection caps must not be removed for opera-
tion. They are part of the insulation system. Operation without
the 2 black protection caps is not permissible.
All inspections and the replacement of components may only
be performed by qualified personnel and must be done ac-
cording to Schaltbau specification.
All components which have to be replaced must be original
components defined by Schaltbau.
During continuous operation the contactors will warm up. It is
recommended to wait an appropriate time before starting any
service and touch the contactors.
CT1000 contactors are high-voltage switches. Getting into
contact with conductive parts of the contactors can result in
serious injury or even death!
Active parts are all piece parts associated with the main cir-
cuit. All metal parts visible may potentially become active un-
der fault conditions. A respective label is attached to the con-
tactor. This label must not be removed.
For safety reasons the contactors must be connected to
earth. An earth terminal is provided for that purpose. The wire
gauge must be observed according to the specific short-
circuit conditions.
CT1000 contactors are designed to be mounted in environ-
ments defined by pollution degree PD3 according to
EN60077-1:
Pollution degree PD3
Conductive pollution or dry non-conductive pollution occurs
which becomes conductive due to condensation which is to
be expected.
Example: Indoor location not directly exposed to rain, snow
and heavy dust.
CT1000 contactors contain strong magnets for the perma-
nent-magnetic blow-out. Make sure that these magnets do
not attract any ferromagnetic particles into the contactors, ei-
ther opened or closed.
These magnets may destroy data on credit cards or such.
During the short time of the switching-off operation strong
magnetic fields are generated in the vicinity of the pole plates.
They may affect other components close to the contactor.

Page 7/25 Rev.1.1 User Manual, Power contactors, series CT1115/04 and CT1130/04
Technical data
Refer to catalogue C20, data sheets and measured drawings.
Applied standards
Refer to catalogue C20.
EN60077-1: 2003-04
Railway applications - Electric equipment for rolling stock
Part 1: General service conditions and general rules
(IEC 60077-1:1999, modified)
EN 60077-2: 2003-04
Railway applications - Electric equipment for rolling stock
Part 2: Electrotechnical components; General rules
(IEC 60077-2:1999, modified)
EN 50124-1: 2010-11
Railway applications - Insulation coordination
Part 1: Basic requirements - Clearances and creepage dis-
tances for all electrical and electronic equipment
EN 61373: 2011-04
Railway applications - Rolling stock equipment
Shock and vibration tests
EN 50125-1: 2010-11
Railway applications –Environmental conditions for equipment
Part 1: Equipment on board rolling stock

Page 8/25 Rev.1.1 User Manual, Power contactors, series CT1115/04 and CT1130/04
Description
CT1000 contactors consist of two main modules:
Lower Module:
Magnetic drive (MD) with moving contact bridge (MC, not visible);
base plate (BP); auxiliary contact group (AG); coil terminal group
(TG); AG and TG are under protection caps.
Upper Module:
Fixed contacts with main terminals (FC); arc chamber (AC); latch-
ing levers (LL) and lock bars (LB)
Lower Module
Magnetic drive (MD) with moving contact bridge (MC)
- Compact magnetic drive system for DC voltages.
- Designed for standard railway supply voltages and tolerances.
Standard nominal supply voltages are Us= 24 V and Us= 110 V,
tolerances from 70% up to 125% of Us. Other nominal supply
voltages are available on request.
- Double-break moving contact bridge.
- Polarity independent overvoltage protection device.
Base plate (BP)
- 4 fixation holes
- Earthing terminal
The contactor should be mounted on a metal rack to provide a se-
cure mounting as well as a heat sink for the magnetic drive.
FC
MD
Upper Module
Lower Module
TG
AG
BP
MC
AC
LL
LB
The value of the overvoltage limitation is part of the
magnetic system and must not be changed or short-
circuited by external means. It is explicitly stated that the
use of diodes is prohibited for that purpose. Take care
there is no such diode in the external control circuit.

Page 9/25 Rev.1.1 User Manual, Power contactors, series CT1115/04 and CT1130/04
Auxiliary contact group (AG)
Standard:
- 1 contact to indicate the “well closed” position of the main con-
tacts (EN60077: a1)
- 1 contact to indicate the “well opened” position of the main con-
tacts (EN60077: b0)
- 2 NO/NC contacts
Option:
- 4 NO/NC contacts
- M3 screw or 6.3 x 0.8 mm fast-on terminals
- Protection cap (can be removed and fixed only when the Upper
Module has been removed)
Coil terminal group (TG)
- Cage clamp terminals
- Protection cap (can be removed and fixed only when the Upper
Module has been removed; fixation with screw M4 x 10)
Upper Module
Fixed contacts with main terminals (FC)
- Press nuts M10 for easy connection of cables
- Mounting hole Ø 12.7 mm for easy connection of current bars
- Minimum wire gauges for connecting cables or current bars must
be observed.
- Double-break contacts
Arc chamber (AC)
- Permanent-magnetic blow-out system with magnets and pole
plates
- Electro-magnetic blow-out system with blow-out coils and pole
plates
- Arc guidance plates
- Ceramic inserts for arc extinction
Latching levers (LL)
- Latching and unlatching simply by turning pole plates. No tool
required.
- Large handles for easy operation.
Lock bars (LB)
- Simple locking and unlocking mechanism with optical control. No
tool required for unlocking.
The Upper Module must be latched and completely
locked before starting operation.
Red bars indicate contactors for vertical mounting posi-
tion
Yellow bars indicate contactors for horizontal mounting
position.

Page 10/25 Rev.1.1 User Manual, Power contactors, series CT1115/04 and CT1130/04
Functional description
The diagram below shows the switching states of the CT1000 contactors.
Typical values:
Typical pull-in time: 120 ms
Typical drop-off time: 60 ms
Time constant of magnetic drive: app. 90 ms
Settling time for b0 switch: up to 10 ms
Zero position
Off
Pull-in time
On
Drop-off time
Settling time
Off
Meaning:
Main contacts
Coil actuation
a1 contact
(well closed)
b0 contact
(well opened)
- Closed
- Open
- Active
- Passive
- Closed
- Open
- Closed
- Open

Page 11/25 Rev.1.1 User Manual, Power contactors, series CT1115/04 and CT1130/04
Order code
Example: CT1130/04 V 110ET-00 001
Number of poles
11 1-pole version
Nominal voltage
15 1.5 kV
30 3 kV
Conventional thermal current
04 400 A
Mounting position
H Horizontal (yellow lock bars)
V Vertical (red lock bars
Supply voltage
24 24 V
110 110 V
Supply voltage tolerance
E -30% … +25%
Coil suppression
T Suppressor diode
Auxiliary contacts
00 1x a1 (S870, refer to catalogue D70)
1x b0 (S870, refer to catalogue D70) M3 screw type terminals
2x NO/NC (S826, refer to catalogue D26)
01 1x a1 (S870, refer to catalogue D70)
1x b0 (S870, refer to catalogue D70) Flat tabs 6.3 x 0.8
2x NO/NC (S826, refer to catalogue D26)
02 4x NO/NC (S826, refer to catalogue D26) M3 screw type terminals
03 4x NO/NC (S826, refer to catalogue D26) Flat tabs 6.3 x 0.8
Special versions:

Page 12/25 Rev.1.1 User Manual, Power contactors, series CT1115/04 and CT1130/04
Storage
Storage
Schaltbau recommends storing the contactors in the original packing box.
The contactors should be stored in a dry and suitable place.
Return shipments
Schaltbau recommends using the original packing box for any return ship-
ments. If no original packing box is available care should be taken to pack
the contactor in a way that prevents damage during the shipment.
Installation
Unpacking and handling
Before opening the packaging, perform a visual inspection for any signs that
could indicate damage having occurred during transport (impacts, bumps,
falling etc.).
Unpack the contactor and put it on the table in an upright position. With one
hand press the release buttons on top of the arc chamber together and turn
the 4 levers down one by one to unlatch the Upper Module. Lift the Upper
Module and put it on the table in an upright position.
Remove both protection covers (the small one is fixed with a M4 x 10 screw,
the big one with knurled thumb screws).
The Lower Module is ready for mounting.
If the contactor has been subject to excessive shock influ-
ence (e.g. during transport) do not install the contactor.
Only single pole contactors may be carried holding the Upper
Module provided the contactors are safely locked and the de-
vices are undamaged.

Page 13/25 Rev.1.1 User Manual, Power contactors, series CT1115/04 and CT1130/04
Operating position
Make sure that you have received the correct contactors for the application.
CT1000 contactors can be mounted horizontally or vertically.
Horizontal mounting position
Vertical mounting position 1
Vertical mounting position 2
In most cases, the contactors are mounted on mounting plates or mounting
frames. They must be solid enough to carry the weight of the contactors un-
der the shock and vibration conditions of the railway environment.
The contactors (Lower Module) are fixed with 4 or more mounting screws,
depending on the number of poles. The screws (and if applicable the nuts)
must be steel grade 8.8. Schaltbau strongly recommends Schnorr-Washers
(or similar) to secure the screws. The screws must be tightened with the rat-
ed torque permissible for the screws and the nuts.
Mechanical requirements
Device dimensions
Refer to the dimensioned drawings of the contactors.
Installation dimensions
Refer to the dimensioned drawings of the contactors.
CT1000 contactors for horizontal mounting must only be
mounted horizontally (Lock bars are yellow, position is also
shown on the labels); they can be mounted in any position in
reference to the direction of movement of the vehicle. Make
sure that both Upper and Lower Module are for horizontal
mounting.
CT1000 contactors for vertical mounting must only be mount-
ed vertically (Lock bars are red, position is also shown on the
labels). Make sure that both Upper and Lower Module are for
vertical mounting.

Page 14/25 Rev.1.1 User Manual, Power contactors, series CT1115/04 and CT1130/04
Electrical requirements
The minimum clearances to earth or other components must be observed.
Refer to the dimensioned drawings for details.
Switching electrical currents at high voltages will produce arcing and plasma
may exit out of the arc chambers. It is essential to observe the minimum
clearance to earth and to the connecting bus bars to avoid the risk of a
flash-over. The minimum clearance has been tested and specified in relation
to the switching capacity of the contactors.
For switching heavy loads allow a minimum time of app. 30 s between
switchings. Allow a recovery time of at least 10 min after 3 heavy load
switchings in succession.
Ensure sufficient ventilation, especially in the case of heavy arc switching.
Allow the exchange of surrounding atmosphere to avoid the risk of flasho-
vers and excessive corrosion.
The minimum gauges for the main terminals and the earth terminal must be
observed. Schaltbau strongly recommends current bars for the connection
of the main terminals with a cross section of 40 x 4 mm.
If wires are being used the wire gauges must be selected in coordination
with their insulation class and the operating conditions.
Undersized gauges for the earth terminal may produce a safety hazard.
Refer to catalogues for the power consumption of the magnetic drive system
and the electrical data of the auxiliary switches.
C20 (Catalogue for Contactors CT1115/04, CT1130/04, CT1115/08 and
CT1130/08)
D26 (Catalogue for Snap Action Switches S826)
D70 (Catalogue for Snap Action Switches S870)
Mechanical installation
Clean the surface of the mounting plate and the base-plate of the contactor
(Lower Module).
Put the Lower Module on the mounting plate and secure with the appropri-
ate screws using the correct tightening torque. Schaltbau strongly recom-
mend Schnorr-Washers (or similar) to secure the screws.
Installation must be carried out by qualified personnel only.

Page 15/25 Rev.1.1 User Manual, Power contactors, series CT1115/04 and CT1130/04
Electrical installation of
the auxiliary switches
Connect the wires for the auxiliary contacts. For the a1 and b0 contacts
(Switches S870) no polarity must be observed. For the general purpose
contacts (Snap action switches S826) the polarity must be observed. The
position of the switches and the terminal numbers are shown on a label on
the protection cap. Bundle and fix the wires as shown below.
Fix the protection cap and tighten the knurled thumb screws. Make sure that
all the washers are close to the nuts when you mount the cover. The wash-
ers must remain outside of the cover. Secure the nuts by hand force as tight
as possible.
Electrical installation of
the magnetic drive
Connect the coil control wires to the cage clamp terminals. No polarity must
be observed. Bundle and fix the wires as shown below.
Fix the protection cap with the M4 x 10 screw (plus flat washer and Schnorr
washer).
The coil is protected against excessive overvoltages (which will occur when
the coil is switched off) by a bi-directional suppressor diode.
The protection cap for the auxiliary switches must not be
removed for operation. It is part of the insulation system.
Operation without the protection cap is not permissible.
The value of the overvoltage limitation is part of the
magnetic system and must not be changed or short-
circuited by external means. It is explicitly stated that the
use of diodes is prohibited for that purpose. Take care
there is no such diode in the external control circuit.

Page 16/25 Rev.1.1 User Manual, Power contactors, series CT1115/04 and CT1130/04
Mounting of the Upper
Module
Mount the Upper Module onto the Lower Module. Make sure all 4 latching
levers are in the open position. Attention: The modules are mechanically
coded. Only one mounting position is possible. Attach the Upper Module in
the correct position. Optical marks and coding pins are provided to ensure
the proper positioning. Do not try to force the Upper Module into the wrong
position!
Close the 4 latching levers and make sure that all 4 lock bars have snapped
in safely. The Upper Module must be fixed tightly to the Lower Module.
Electrical installation of
the main circuit
If you use wires for the connection of the main terminals, the cable lugs can
be placed on top of the main terminals and tightened with the appropriate
screws. Schaltbau strongly recommends Schnorr-Washers (or similar) to
secure the screws. The screws must be tightened with the rated torque (re-
fer to label on the Upper Module).
If you want to use current bars as recommended by Schaltbau, it is better to
mount the bars below the main terminal. This way maintenance is much
easier and the upper module can be removed without removing the current
bars. Schaltbau is supplying CT1000 contactors without the press nut for
this purpose.
If the current bars are even slightly flexible, they can be connected to the
main terminals directly.
Make sure the connection areas are free of corrosion.
The photos show the connection of CT1130/08. The connec-
tion of CT1115/04 and CT1130/04 is identical.

Page 17/25 Rev.1.1 User Manual, Power contactors, series CT1115/04 and CT1130/04
If the current bars are rather inflexible it is recommended to use an addition-
al angled bar. This way it is possible to compensate mechanical tolerances
between the mounting platform for the lower module and the current bars in
all 3 axes.
Electrical installation of
the earth terminal
Connect the earthing cable to the earth terminal with the appropriate screw.
Schaltbau strongly recommends a Schnorr-Washer (or similar) to secure the
screw.
Commissioning
After installation the following checks are recommended:
a) Check the protective earth
b) Check the main connections
c) Check the control connections
d) Check the latching and locking between Upper and Lower Module
e) Check that both protection covers are fitted
f) Several activation and deactivation operations of the contactor with-
out the main circuit active
g) Check the function of the auxiliary contacts
The use of press nuts in the current bars will simplify installa-
tion and maintenance.

Page 18/25 Rev.1.1 User Manual, Power contactors, series CT1115/04 and CT1130/04
Maintenance
CT1000 contactors are maintenance-free within the rated mechanical
life time. The electrical life time depends on the number of switchings
under heavy load conditions and may vary for different applications.
In normal use, this corresponds to a decade-long operating period.
Recommended regular
service intervals
Checking activity designation
Checking interval
Optical inspection from outside
1x annually
Inspection of the main contacts
1x to 2x annually depending on ap-
plication
Inspection of the auxiliary contacts
Every 2 years
Unscheduled service in-
tervals
Inspection activities
High voltage supply cables or current bars
Check of the high voltage supply cables/bars and the tightening torques of
the fastening screws.
Earthing
Check of the supply cables and the tightening torques of the fastening
screw.
Cleaning
In case of excessive dirt the surface of the contactors should be cleaned.
Inspection of the main contacts
Disconnect the main terminals and remove the Upper Module. Inspect the
main contacts (both fixed and movable contacts).
It requires some experience to evaluate the state of the contacts. Even after
only a few switchings under load the contacts look used and “polluted” for
the inexperienced eye. Contacts need only to be replaced if the wear of the
contact tips is more than 70%.
Replace the Upper Module and secure it. Reconnect the main terminals.
Inspection of the auxiliary contacts
Disconnect the main terminals and remove the Upper Module.
Remove the protection cover. The auxiliary switches are visible for a simple
optical inspection from the outside (housings are clean and do not show
signs of short-circuits etc.). Under normal working conditions (no short cir-
cuit switching) the life time of the auxiliary switches exceeds those of the
contactors.
Replace the protection cap and the Upper Module and secure it. Reconnect
the main terminals.
Auxiliary switches S870 are not visible when you have removed the cap.
You will need to remove the 2 screws and lift the assembly for inspection.
Extraordinary services need only be carried out if there has
been a significant and extraordinary recorded number of
switchings under fault conditions.
If the contactors are being used in particularly dirty environ-
ments, the checking intervals for the optical inspection should
be shortened, because dirt can impair the insulation clear-
ances and there is therefore the possibility of a shorter ser-
vice life or an operational fault.

Page 19/25 Rev.1.1 User Manual, Power contactors, series CT1115/04 and CT1130/04
Spare parts, replacement
of parts
The contactors are maintenance-free. There is therefore no general provi-
sion for replacing components during its service life.
However, in case of permanent heavy load switchings, of failures, of short-
circuit switchings or in similar cases spare parts are offered by Schaltbau.
Main contacts and ceramic protection insert
If the main contacts have to be replaced all 4 contacts must be replaced (the
moving bridge and the 2 fixed terminals).
Disconnect the main cables/current bars
Remove the Upper Module.
Remove the protection caps
Dismount the contactor.
Remove the moving bridge
Remove the nut at the bottom of the contactor with a number 8 socket
wrench and put the nut and the washer aside. The nut is secured with
red locking varnish which will be destroyed during that operation. The
moving bridge can be pulled out of the guidance.
Insert the replacement bridge
Mount the new bridge from the top and secure it with washer and nut
(Torque = 4 Nm). Secure the nut again with red locking varnish.
Test the replacement bridge
Lift the bridge. The bridge must be movable up and down easily.
Only original spare parts are to be used as a replacement
MC CT1015/04
CT1015/04, terminal with fixed contact (order 2 per pole)
MC CT1030/04
CT1030/04, terminal with fixed contact (order 2 per pole)
CB CT1030/04
CT1015/04 / CT1030/04, moving contact bridge (order 1 per
pole)
PI CT1030/04
CT1030/04, protection insert (order 2 per pole)

Page 20/25 Rev.1.1 User Manual, Power contactors, series CT1115/04 and CT1130/04
Remove and replace the fixed contacts (and ceramic protection insert)
Put the Upper Module onto the table upside down on a smooth surface.
The latching levers must be in the closed position to avoid damage
Remove all four M5 screws with a number 8 socket
wrench and put the screws and washers aside. Two
screws are secured with red locking varnish which
will be destroyed during that operation.
The fixed contacts must be pushed slightly to the
middle to meet the gap and can then be removed
easily.
The copper wire may be pushed slightly to the side.