AEC IST5015 User manual

Tower UPS 10kVA~40kVA User Manual I
Preface
IST5
10 –40 KVA
Preface
Usage
The manual contains information on installing, using, operation and maintenance of
the Tower UPS. Please carefully read this manual prior to installation.
Users
Technical Support Engineer
Maintenance Engineer
Note
Our company is providing a full range of technical support and services. Customer
can contact our local office or customer service center for help.
The manual will update irregularly, due to the product upgrading or other reasons.
Unless otherwise agreed，the manual is only used as guide for users and any
statements or information contained in this manual make no warranty expressed or
implied.

II Tower UPS 10kVA~40kVA User Manual
Contents
Contents
1. Safety Precautions.........................................................................................................................1
Safety Message Definition........................................................................................................1
Warning Label...........................................................................................................................1
Safety Instruction......................................................................................................................1
Move & Install..........................................................................................................................1
Debug & Operate......................................................................................................................2
Maintenance & Replacement....................................................................................................2
Battery Safety............................................................................................................................3
Disposal.....................................................................................................................................4
2. Product Introduction .....................................................................................................................5
2.1 System Configuration .........................................................................................................5
2.3 Operation Mode ..................................................................................................................5
2.3.1 Normal Mode...........................................................................................................5
2.3.2 Battery Mode............................................................................................................6
2.3.3 Bypass Mode............................................................................................................6
2.3.4 Maintenance Mode (Manual Bypass) ......................................................................7
2.3.5 ECO Mode ...............................................................................................................7
2.3.6 Auto-restart Mode ....................................................................................................8
2.3.7 Frequency Converter Mode......................................................................................8
2.4 UPS Structure......................................................................................................................8
2.4.1 UPS Configuration...................................................................................................8
2.4.2 UPS Outlook............................................................................................................8
3. Installation Instruction ................................................................................................................13
3.1 Location ............................................................................................................................13
3.1.1 Installation Environment........................................................................................13
3.1.2 Site Selection..........................................................................................................13
3.1.3 Size and Weight......................................................................................................13
3.2 Unloading and Unpacking.................................................................................................16
3.2.1 Moving and Unpacking of the Cabinet ..................................................................16
3.3 Positioning ........................................................................................................................18
3.3.1 Positioning Cabinet................................................................................................18
3.4 Battery...............................................................................................................................19
3.5 Cable Entry .......................................................................................................................20
3.6 Power Cables.....................................................................................................................21
3.6.1 Specifications.........................................................................................................21
3.6.2 Specifications for Power Cables Terminal.............................................................21
3.6.3 Circuit Breaker.......................................................................................................22
3.6.4 Connecting Power Cables......................................................................................22
3.7 Control and Communication Cables.................................................................................23
3.7.1 Dry Contact Interface.............................................................................................24

IST5 Tower UPS 10kVA~40kVA User Manual III
Contents
3.7.2 Communication Interface.......................................................................................29
4. LCD Panel...................................................................................................................................30
4.1 Introduction.......................................................................................................................30
4.2 LCD panel for Cabinet......................................................................................................30
4.2.1 LED Indicator ........................................................................................................30
4.2.2 Control and Operation Keys...................................................................................31
4.2.3 LCD Screen............................................................................................................32
4.3 System Information Window ............................................................................................34
4.4 Menu Window...................................................................................................................34
4.5 Event List..........................................................................................................................35
5. Operations...................................................................................................................................39
5.1 UPS Start-up .....................................................................................................................39
5.1.1 Start from Normal Mode........................................................................................39
5.1.2 Start from Battery...................................................................................................40
5.2 Procedure for Switching between Operation Modes.........................................................40
5.2.1 Switching the UPS into Battery Mode from Normal Mode...................................40
5.2.2 Switching the UPS into Bypass Mode from Normal Mode...................................40
5.2.3 Switching the UPS into Normal Mode from Bypass Mode...................................41
5.2.4 Switching the UPS into Maintenance Bypass Mode from Normal Mode..............41
5.2.5 Switching the UPS into Normal Mode from Maintenance Bypass Mode..............42
5.3 Battery Maintenance.........................................................................................................42
5.4 EPO...................................................................................................................................42
5.5 Installation of Parallel Operation System..........................................................................43
5.5.1 Parallel system diagram .........................................................................................43
5.5.2 Parallel system setting............................................................................................46
6. Maintenance................................................................................................................................49
6.1 Precautions........................................................................................................................49
6.2 Instruction for Maintaining UPS.......................................................................................49
6.3 Instruction for Maintaining Battery string ........................................................................49
6.2.4 Installation of internal battery................................................................................50
7. Product Specification..................................................................................................................55
7.1 Applicable Standards.........................................................................................................55
7.2 Environmental Characteristics..........................................................................................55
7.3 Mechanical Characteristic.................................................................................................55
7.4 Electrical Characteristics...................................................................................................56
7.4.1 Electrical Characteristics (Input Rectifier).............................................................56
7.4.2 Electrical Characteristics (Intermediate DC Link).................................................57
7.4.3 Electrical Characteristics (Inverter Output) ...........................................................57
7.4.4 Electrical Characteristics (Bypass Mains Input) ....................................................58
7.5 Efficiency..........................................................................................................................58
7.6 Display and Interface ........................................................................................................58

IST5 Tower UPS 10kVA~40kVA User Manual 1
Safety Precautions
1. Safety Precautions
This manual contains information concerning the installation and operation of Tower
UPS. Please carefully read this manual prior to installation.
The Tower UPS cannot be put into operation until it is commissioned by engineers
approved by the manufacturer (or its agent). Not doing so could result in personnel
safety risk, equipment malfunction and invalidation of warranty.
Safety Message Definition
Danger: Serious human injury or even death may be caused, if this requirement is
ignored.
Warning: Human injury or equipment damage may be caused, if this requirement is
ignored.
Attention: Equipment damage, loss of data or poor performance may be caused, if this
requirement is ignored.
Commissioning Engineer: The engineer who installs or operates the equipment should
be well trained in electricity and safety and familiar with the operation, debug, and
maintenance of the equipment.
Warning Label
The warning label indicates the possibility of human injury or equipment damage, and
advises the proper step to avoid the danger. In this manual, there are three types of
warning labels as below.
Labels
Description
Danger
Serious human injury or even death may be caused, if this requirement is ignored.
Warning
Human injury or equipment damage may be caused, if this requirement is ignored.
Attention
Equipment damage, loss of data or poor performance may be caused, if this
requirement is ignored.
Safety Instruction
Danger
Performed only by commissioning engineers.
This UPS is designed for commercial and industrial applications only, and is not
intended for any use in life-support devices or system.
Warning
Read all the warning labels carefully before operation, and follow the
instructions.
When the system is running, do not touch the surface with this label, to avoid
any hurt of scald.
ESD sensitive components inside the UPS, anti-ESD measure should be taken
before handling.
Move & Install
Danger
Keep the equipment away from heat source or air outlets.
In case of fire, use dry powder extinguisher only, any liquid extinguisher can

Safety Precautions
2 IST5 Tower UPS 10kVA~40kVA User Manual
result in electric shock.
Warning
Do not start the system if any damage or abnormal parts founded.
Contacting the UPS with wet material or hands may be subject to electric
shock.
Attention
Use proper facilities to handle and install the UPS. Shielding shoes, protective
clothes and other protective facilities are necessary to avoid injury.
During positioning, keep the UPS way from shock or vibration.
Install the UPS in proper environment, more detail in section 3.3.
Debug & Operate
Danger
Make sure the grounding cable is well connected before connecting the power
cables, the grounding cable and neutral cable must be in accordance with the
local and national codes practice.
Before moving or re-connecting the cables, make sure to cut off all the input
power sources, and wait for at least 10 minutes for internal discharge. Use a
multi-meter to measure the voltage on terminals and ensure the voltage is
lower than 36V before operation.
Attention
The earth leakage current of load will be carried by RCCB or RCD.
Initial check and inspection should be performed after long time storing of
UPS.
Maintenance & Replacement
Danger
All the equipment maintenance and servicing procedures involving internal
access need special tools and should be carried out only by trained personnel.
The components that can onlybe accessed byopening the protective cover with
tools cannot be maintained by user.
This UPS full complies with “IEC62040-1-1-General and safety requirements
for use in operator access area UPS”. Dangerous voltages are present within the
battery box. However, the risk of contact with these high voltages is minimized
for non-service personnel. Since the component with dangerous voltage can
only be touched by opening the protective cover with a tool, the possibility of
touching high voltage component is minimized. No risk exists to any personnel
when operating the equipment in the normal manner, following the
recommended operating procedures in this manual.
Battery Safety
Danger
All the battery maintenance and servicing procedures involving internal access
need special tools or keys and should be carried out only by trained personnel.
WHEN CONNECTED TOGETHER, THE BATTERY TERMINAL
VOLTAGE WILL EXCEED 400Vdc AND IS POTENTIALLY LEATHAL.
Battery manufacturers supply details of the necessary precautions to be
observed when working on, or in the vicinity of, a large bank of battery cells.

IST5 Tower UPS 10kVA~40kVA User Manual 3
Safety Precautions
These precautions should be followed implicitly at all times. Particular
attention should be paid to the recommendations concerning local
environmental conditions and the provision of protective clothing, first aid and
fire-fighting facilities.
Ambient temperature is a major factor in determining the battery capacity and
life. The nominal operating temperature of battery is 20°C. Operating above
this temperature will reduce the battery life. Periodically charge the battery
according to the battery user manuals to ensure the back-up time of UPS.
Replace the batteries only with the same type and the same number, or it may
cause explosion or poor performance.
When connecting the battery, follow the precautions for high-voltage
operation before accepting and using the battery, check the appearance the
battery. If the package is damaged, or the battery terminal is dirty, corroded or
rusted or the shell is broken, deformed or has leakage, replace it with new
product. Otherwise, battery capacity reduction, electric leakage or fire may be
caused.
Before operating the battery, remove the finger ring, watch, necklace,
bracelet and any other metal jewelry
Wear rubber gloves.
Eye protection should be worn to prevent injuryfrom accidental electrical
arcs.
Only use tools (e.g. wrench) with insulated handles.
The batteries are veryheavy. Please handle and lift the batterywith proper
method to prevent any human injury or damage to the battery terminal.
Do not decompose, modify or damage the battery. Otherwise, battery
short circuit, leakage or even human injury may be caused.
The battery contains sulfuric acid. In normal operation, all the sulfuric
acid is attached to the separation board and plate in the battery. However,
when the battery case is broken, the acid will leak from the battery.
Therefore, be sure to wear a pair of protective glasses, rubber gloves and
skirt when operating the battery. Otherwise, you may become blind if acid
enters your eyes and your skin may be damaged by the acid.
At the end of battery life, the battery may have internal short circuit, drain
of electrolytic and erosion of positive/negative plates. If this condition
continues, the battery may have temperature out of control, swell or leak.
Be sure to replace the battery before these phenomena happen.
If a battery leaks electrolyte, or is otherwise physically damaged, it must
be replaced, stored in a container resistant to sulfuric acid and disposed
of in accordance with local regulations.
If electrolyte comes into contact with the skin, the affected area should
be washed immediately with water.
Disposal
Warning
Dispose of used battery according to the local instructions

Installation Instruction
4 IST5 Tower UPS 10kVA~40kVA User Manual
2. Product Introduction
2.1 System Configuration
The Tower UPS is configured by the following part: Rectifier, Charger, Inverter, Static
Switch and Manual Bypass Switch. One or several battery strings should be installed to
provide backup energy once the utility fails. The UPS structure is shown in Fig. 2-1.
Main Input
Static Switch
Manual Bypass
Load
Battery
Bypass Input
Output Switch
Rectifier/
Discharger
Charger
Inverter
Fig. 2-1 UPS Configuration
2.3 Operation Mode
The Modular UPS is an on-line, double-conversion UPS that permits operation in the
following modes:
Normal mode
Battery mode
Bypass mode
Maintenance mode (manual bypass)
ECO mode
Auto-restart mode
Frequency Converter mode
2.3.1 Normal Mode
The inverter of power modules continuously supply the critical AC load. The
rectifier/charger derives power from the AC mains input source and supplies DC power
to the inverter while simultaneously FLOAT or BOOST charging its associated backup
battery.

IST5 Tower UPS 10kVA~40kVA User Manual 5
Installation Instruction
Rectifier/
Discharger
Main Input
Static Switch
Manual Bypass
Inverter
Charger
Load
Battery
Bypass Input
Output Switch
Fig 2-2 Normal mode operation diagram
2.3.2 Battery Mode
Upon failure of the AC mains input power, the inverter of power modules, which obtain
power from the battery, supply the critical AC load. There is no interruption in power
to the critical load upon failure. After restoration of the AC mains input power, the”
Normal mode” operation will continue automatically without the necessity of user
intervention.
Rectifier/
Discharger
Main Input
Static Switch
Manual Bypass
Inverter
Load
Battery
Bypass Input
Output Switch
Fig 2-3 Battery mode operation diagram
Note
With the function of Battery cold start, the UPS may start without utility. See more detail in section
5.1.2.
2.3.3 Bypass Mode
If the inverter overload capacity is exceeded under Normal mode, or if the inverter
becomes unavailable for any reason, the static transfer switch will perform a transfer of
the load from the inverter to the bypass source, with no interruption in power to the
critical AC load. Should the inverter be asynchronous with the bypass, the static switch
will perform a transfer of the load from the inverter to the bypass with power
interruption to the load. This is to avoid large cross currents due to the paralleling of
unsynchronized AC sources. This interruption is programmable but typically set to be
less than 3/4 of an electrical cycle, e.g., less than 15ms (50Hz) or less than 12.5ms
(60Hz). The action of transfer/re-transfer can also be done by the command through
monitor.

Installation Instruction
6 IST5 Tower UPS 10kVA~40kVA User Manual
Rectifier/
Discharger
Main Input
Static Switch
Manual Bypass
Inverter
Charger
Load
Battery
Bypass Input
Output Switch
Fig. 2-4 Bypass mode operation diagram
2.3.4 Maintenance Mode (Manual Bypass)
A manual bypass switch is available to ensure continuity of supply to the critical load
when the UPS becomes unavailable e.g. during a maintenance procedure. (See Fig.2-
5).
Main Input
Manual Bypass
Battery
Bypass Input
Output Switch
Rectifier/
Discharger Inverter
Charger
Load
Fig .2-5 Maintenance mode operation diagram
Danger
During Maintenance mode, dangerous voltages are present on the terminal of input, output and
neutral, even with all the modules and the LCD turned off.
2.3.5 ECO Mode
To improve system efficiency, UPS rack system works in Bypass mode at normal time,
and inverter is standby. When the utility fails, the UPS transfers to Battery Mode and
the inverter powers the loads.

IST5 Tower UPS 10kVA~40kVA User Manual 7
Installation Instruction
Rectifier/
Discharger
Static Switch
Inverter
Charger
Load
Output Switch
Bypass Input
Main Input
Battery
Manual Bypass
Fig.2-6 ECO Mode operation diagram
Note
There is a short interruption time (less than 10ms) when transfer from ECO mode to battery mode,
it must be sure that the interruption has no effect on loads.
2.3.6Auto-restart Mode
The battery may become exhausted following an extended AC mains failure. The
inverter shuts down when the battery reaches the End of Discharge Voltage (EOD). The
UPS may be programmed to “System Auto Start Mode after EOD”. The system starts
after a delay time when the AC mains recovers. The mode and the delay time are
programmed by the commissioning engineer.
2.3.7 Frequency Converter Mode
By setting the UPS to Frequency Converter mode, the UPS could present a stable output
of fixed frequency (50 or 60Hz), and the bypass static switch is not available.
2.4 UPS Structure
2.4.1 UPS Configuration
The UPS configuration is provided in Table 2.1
Table2.1 UPS Configuration
Item
Components
Quantity
Remark
Standard Backup
Type
Circuit Breakers
5
Standard
Dual Input
1
Standard
Parallel Card,
1
Optional
Dry Contact Card
1
Optional
Long Backup Type
Circuit Breakers
4
Standard
Dual Input
1
Standard
Parallel Card,
1
Optional
Dry Contact Card
1
Optional
)

Installation Instruction
8 IST5 Tower UPS 10kVA~40kVA User Manual
Protective
Cover
Dry
Contact
Parallel
Board
USB
RS485
RS232
Connection terminal
Output CB
Main input CB
Bypass Input CB
Maintenance CB
Battery Cold Start
SNMP
Fig. 2-11 10/15 kVA back appearance
SNMP
Dry Contact
Parallel board
Main input CB
Connection terminals
232
Cold start
button
485
Bypass Input CB
Maintenance
switch
Output CB
Protective
cover
Air vent
USB
Fig. 2-12 20/30kVA back appearance

IST5 Tower UPS 10kVA~40kVA User Manual 9
Installation Instruction
Parallel board
Dry contact
Bypass Input CB
Input CB
Air vent
Connection terminals
Cold start
Output CB
Maintenance
switch
Fig. 2-13 40kVA back appearance
Note
The Standard product is configured with single input; the dual-input option is available, with an
additional breaker for the main input.

Installation Instruction
10 IST5 Tower UPS 10kVA~40kVAUser Manual
3. Installation Instruction
3.1 Location
As each site has its requirements, the installation instructions in this section are to act
as a guide for the general procedures and practices that should be observed by the
installing engineer.
3.1.1 Installation Environment
The UPS is intended for indoor installation and uses forced convection cooling by
internal fans. Please make sure there is enough space for the UPS ventilation and
cooling.
Keep the UPS far away from water，heat and inflammable and explosive, corrosive
material. Avoid installing the UPS in the environment with direct sunlight, dust, volatile
gases, corrosive material and high salinity.
Avoid installing the UPS in the environment with conductive dirt.
The operating environment temperature for battery is 20℃-25℃. Operating above 25
℃will reduce the battery life, and operation below 20℃will reduce the battery
capacity.
The battery will generate a little amount of hydrogen and oxygen at the end of charging;
ensure the fresh air volume of the battery installation environment must meet EN50272-
2001 requirements.
If external batteries are to be used, the battery circuit breakers (or fuses) must be
mounted as close as possible to the batteries, and the connecting cables should be as
short as possible.
3.1.2 Site Selection
Ensure the ground or installation platform can bear the weight of the UPS cabinet
,batteries and battery rack．
No vibration and less than 5 degree inclination horizontally.
The equipment should be stored in a room so as to protect it against excessive humidity
and heat sources.
The battery needs to be stored in dry and cool place with good ventilation. The most
suitable storage temperature is 20 ºC to 25ºC.
3.1.3 Size and Weight
The size of three dimensions for the UPS cabinet is shown in Fig.3-1.
Attention
Ensure there is at least 0.8mbefore the front of the cabinetso as toeasilymaintain the power module
and at least 0.5m behind for ventilation and cooling. The room reserved for the cabinet is shown
in Fig.3-3.

IST5 Tower UPS 10kVA~40kVA User Manual 11
Installation Instruction
The weight for the UPS cabinet is shown in Table 1.1
Table 1.1Weight for the cabinet
Configuration
Weight
10kVA/15kVA Standard Backup Type
50kg(No Batteries Included）
10kVA/15kVA Long Backup Type
28kg
20kVA/30kVA Standard Backup Type
88kg(No Batteries Included)
20kVA/30kVA Long Backup Type
50kg
40kVA Long Backup Type
61kg
3.2 Unloading and Unpacking
3.2.1 Moving and Unpacking of the Cabinet
The steps to move and unpack the cabinet are as follows：
1. Check if any damages to the packing. (If any, contact to the carrier)
2. Transport the equipment to the designated site by forklift, as shown in
Fig.3-5.
Fig.3-5 Transport to the designated site
3. Unpack the package (see Fig.3-6).

Installation Instruction
12 IST5 Tower UPS 10kVA~40kVAUser Manual
Fig.3-6 Disassemble the case
4. Remove the protective foam around the cabinet.
Fig.3-7 Remove the protective foam

IST5 Tower UPS 10kVA~40kVA User Manual 13
Installation Instruction
5. Check the UPS.
(a) Visually examine if there are any damages to UPS during transportation. If
any, contact to the carrier.
(b) Check the UPS with the list of the goods. If any items are not included in the
list, contact to our company or the local office.
6. Dismantle the bolt that connects the cabinet and wooden pallet after
disassembly.
7. Move the cabinet to the installation position.
Attention
Be careful while removing to avoid scratching the equipment.
Attention
The waste materials of unpacking should be disposed to meet the demand for environmental
protection.
3.3 Positioning
3.3.1 Positioning Cabinet
The UPS cabinet has two way of supporting itself: One is to support itself temporarily
by the four wheels at the bottom，making it convenient to adjust the position of the
cabinet；The other is by anchor bolts to support the cabinet permanently after adjusting
the position of the cabinet. The supporting structure is shown in Fig. 3-8.
nchor bolt
Wheels
Bracket

Installation Instruction
14 IST5 Tower UPS 10kVA~40kVAUser Manual
Fig.3-8 Supporting structure（Bottom view）
The steps to position the cabinet are as follows：
1. Ensure the supporting structure is in good condition and the mounting floor is
smooth and strong.
2. Retract the anchor bolts by turning them counterclockwise using wrench, the
cabinet is then supported by the four wheels.
3. Adjust the cabinet to the right position by the supporting wheels.
4. Put down the anchor bolts by turning them clockwise using wrench, the cabinet is
then supported by the four anchor bolts.
5. Ensure the four anchor bolts are in the same height and the cabinet is fixed and
immovable.
6. Positioning done.
Attention
Auxiliary equipment is needed when the mounting floor is not solid enough to support the cabinet,
which helps distribute the weight over a larger area. For instance, cover the floor with iron plate or
increase the supporting area of the anchor bolts.
3.4 Battery
Three terminals（positive，neutral，negative ）are drawn from the battery unit and
connected to UPS system. The neutral line is drawn from the middle of the batteries in
series (See Fig.3-9).
+-
N
N
40 batteries in series
403921
Fig 3-9 Battery string wiring diagram
Danger
The battery terminal voltage is of more than 200Vdc, please follow the safety instructions to avoid
electric shock hazard.
Ensure the positive, negative, neutral electrode is correctly connected from the battery unit terminals
to the breaker and from the breaker to the UPS system.

IST5 Tower UPS 10kVA~40kVA User Manual 15
Installation Instruction
3.5 Cable Entry
Cables can enter the UPS cabinet from the side or from the bottom. Cable entry is made
possible through a blanking plate fitted at the bottom of the equipment. The cable entry
is shown in Fig.3-11.
Cable connection
Cable connection
Fig.3-10 Cable entry
3.6 Power Cables
3.6.1 Specifications
The UPS power cables are recommended in Table 3.2.
Table 3.2 Recommended cables for power cables
Contents
10/15kVA
20/30kVA
40kVA
Main Input
Main Input Current(A)
18/28A
35/55A
70A
Cable Section
（mm²）
A
6
10
16
B
6
10
16
C
6
10
16
N
6
10
16
Main Output
Main Output Current(A)
15/23A
30/45A
60A
Cable Section
（mm²）
A
6
10
16
B
6
10
16
C
6
10
16
N
6
10
16
Bypass Input
（Optional）
Bypass Input Current(A)
15/23A
30/45A
60A
Cable Section
（mm²）
A
6
10
16
B
6
10
16
C
6
10
16
N
6
10
16

Installation Instruction
16 IST5 Tower UPS 10kVA~40kVAUser Manual
Battery Input
Battery Input current(A)
20/30A
40/60A
80A
Cable Section
（mm²）
+
8
16
25
-
8
16
25
N
8
16
25
PE
Cable Section
（mm²）
PE
6
10
16
Note
The recommended cable section for power cables are only for situations described below：
Ambient temperature：30℃.
AC loss less than 3%，DC loss less than 1%，The length of theAC power cables are no
longer than 50 m and the length of the DC power cables are no longer than 30 m.
Currents listed in the table are based on the 208V system (Line-to-line voltage).
The size of neutral lines should be 1.5~1.7 times the value listed above when the predominant
load is non-linear.
3.6.2 Specifications for Power Cables Terminal
Specifications for power cables connector are listed as Table 3.3.
Table 3.3 Requirements for power module terminal
Port
Connection
Bolt
BoltAperture
Torque
Moment
Mains input
Cables crimped
OT terminal
M6
7mm
4.9Nm
Bypass Input
Cables crimped
OT terminal
M6
7mm
4.9Nm
Battery Input
Cables crimped
OT terminal
M6
7mm
4.9Nm
Output
Cables crimped
OT terminal
M6
7mm
4.9Nm
PE
Cables crimped
OT terminal
M6
7mm
4.9Nm
3.6.3 Circuit Breaker
The circuit breakers (CB) for the system are recommended in Table 3.4.
Table 3.4 Recommended CB
Installed position
10/15kVA
20kVA
30kVA
40kVA
Battery CB
32A,250Vdc
50A,250Vdc
63A,250Vdc
100A,250Vdc
Attention
The CB with RCD (Residual Current Device) is not suggested for the system.