SMA NA-BOX 12 User manual

NA-BOX-12-3-20-BE-en-11 | Version 1.1 ENGLISH
Operating Manual
NA-BOX 12

Legal Provisions SMA Solar Technology AG
2 NA-BOX-12-3-20-BE-en-11 Operating Manual
Legal Provisions
The information contained in this document is the property of SMA Solar Technology AG. Publishing its content, either
partially or in full, requires the written permission of SMA Solar Technology AG. Any internal company copying of the
document for the purposes of evaluating the product or its correct implementation is allowed and does not require
permission.
SMA Warranty
You can download the current warranty conditions from the Internet at www.SMA-Solar.com.
Trademarks
All trademarks are recognized, even if not explicitly identified as such. A lack of identification does not mean that a
product or symbol is not trademarked.
The BLUETOOTH® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of these
marks by SMA Solar Technology AG is under license.
Modbus® is a registered trademark of Schneider Electric and is licensed by the Modbus Organization, Inc.
QR Code is a registered trademark of DENSO WAVE INCORPORATED.
Phillips® and Pozidriv® are registered trademarks of Phillips Screw Company.
Torx® is a registered trademark of Acument Global Technologies, Inc.
SMA Solar Technology AG
Sonnenallee 1
34266 Niestetal
Germany
Tel. [phone]
Fax [phone]
www.SMA.de
E-mail: [email protected]
© 2004 to 2015 SMA Solar Technology AG. All rights reserved.

SMA Solar Technology AG Table of Contents
Operating Manual NA-BOX-12-3-20-BE-en-11 3
Table of Contents
1 NA-BoxInformation on this Document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Target Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Additional Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4 Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.5 Typographies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.6 Nomenclature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Intended Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Scope of Delivery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1 NA-Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 Type Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.1 Storing the NA-Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2 Requirements for Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.3 Preparing the Mounting Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.4 Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.4.1 Transport Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
5.4.2 Transporting and Mounting the NA-Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
6 Electrical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.1 Overview of the Connection Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.1.1 Components and Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
6.1.2 Enclosure Openings in the Floor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
6.2 Connecting the Multicluster-Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.3 Connecting the Utility Grid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.4 Connecting the Control Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.5 Mounting the Kick Plates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7 Preparing the Multicluster System for Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8 Disconnecting the NA-Box and Multicluster System from Voltage Sources . . . . . . . . . . . . . . . 22
9 Periodic Actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
9.1 Removing the Protective Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
9.2 Mounting the Protective Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
9.3 Inserting the Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
9.4 Connection to Spring-Cage Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
9.4.1 Connecting Power Cables to Spring-Cage Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
9.4.2 Connecting Control Cables to Spring-Cage Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Table of Contents SMA Solar Technology AG
4 NA-BOX-12-3-20-BE-en-11 Operating Manual
10 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
10.1 Testing the Residual-Current Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
10.2 Testing the Surge Arrester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10.3 Testing the Tie Switch Tripping Function Every 6 Months. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
10.4 Maintenance Work Every 12 Months . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
11 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
11.1 Disassembling the NA-Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
11.2 Disposing of the NA-Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
12 Technical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
13 Contact. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

SMA Solar Technology AG 1 Information on this Document
Operating Manual NA-BOX-12-3-20-BE-en-11 5
1 Information on this Document
1.1 Validity
This document is valid for the device type "NA-BOX-12.3-20" (NA-Box 12).
1.2 Target Group
The activities described in this document must be performed by qualified persons only. Qualified persons must have the
following skills:
• Training in how to deal with the dangers and risks associated with installing and operating electrical devices and
batteries
• Training in the installation and commissioning of electrical devices
• Knowledge of and adherence to the local standards and directives
• Knowledge of and compliance with this document and all safety information
1.3 Additional Information
Links to additional information can be found at www.SMA-Solar.com:
1.4 Symbols
Document title and content Document type
MULTICLUSTER-BOX 12 Installation – circuitry overview
MULTICLUSTER-BOX 12 Operating manual
Symbol Explanation
'$1*(5
Indicates a hazardous situation that, if not avoided, will result in death or serious injury
:$51,1*
Indicates a hazardous situation that, if not avoided, can result in death or serious injury
&$87,21
Indicates a hazardous situation that, if not avoided, can result in minor or moderate injury
/05*$&
Indicates a situation that, if not avoided, can result in property damage
Information that is important for a specific topic or goal, but is not safety-relevant
 Indicates a requirement for meeting a specific goal
 Desired result
✖ A problem that might occur

1 Information on this Document SMA Solar Technology AG
6 NA-BOX-12-3-20-BE-en-11 Operating Manual
1.5 Typographies
1.6 Nomenclature
Typography Application Example
bold • Display messages
• Parameters
•Terminals
•Slots
• Elements to be selected or entered
• Connect the line conductors to the
spring-cage terminals L1, L2 and L3 on the
MC BOX terminal.
>• Links several elements to be
selected
–
[Button/Key] • Button on the device to be selected
or pressed
• Press the [TEST] button on each
residual-current device in the NA-Box.
Complete designation Designation in this document
Multicluster-Box 12 Multicluster-Box
NA-Box 12 NA-Box

SMA Solar Technology AG 2 Safety
Operating Manual NA-BOX-12-3-20-BE-en-11 7
2 Safety
2.1 Intended Use
The NA-Box is an automatic transfer switch and enables the operation of an SMA multicluster system on a utility grid in
accordance with the VDE-AR-N 4105 application regulations. In the event of a grid failure, the NA-Box disconnects the
SMA multicluster system from the utility grid via a redundant tie switch.
Figure1: Circuitry principle of a multicluster system with the NA-Box
If the NA-Box is used, the utility grid must be either a TN-S-, TN-C-S- or TT system. No additional grounding measures are
required.
Do not exceed the maximum AC connection power of the NA-Box. When using an NA-Box in Germany, the following
additional connection conditions must be observed:
• Maximum output power of the PV system: 100 kW
• Maximum feed-in power into the utility grid: 100 kW
Cables with copper conductors must be used for the installation.
In terms of interference immunity, the product is suitable for EMC environment A* , and in terms of EMC emissions, it is
suitable for EMC environment B*.
BATFUSE
SUNNY ISLAND
NA-BOX
Load
contactor
MULTICLUSTER BOX
(Main AC distribution board)
PV main
distribution box
(not included in the
delivery)
BATTERY
Generator
contactor GENERATOR
LOAD
PV MODULES
PV INVERTERS
UTILITY GRID

2 Safety SMA Solar Technology AG
8 NA-BOX-12-3-20-BE-en-11 Operating Manual
The NA-Box may only be commissioned in conjunction with the Multicluster-Box.
The NA-Box is designed for use at altitudes of up to 2000 m above Mean Sea Level. If you would like to use the NA-Box
at altitudes above 2000 m, contact Service (see Section13, page37).
The NA-Box is suitable for indoor use. The product may only be operated at temperatures between − 20°C and +50°C.
All work on the product must only be performed using appropriate tools and in compliance with the ESD protection
regulations.
Suitable personal protective equipment must be worn by all persons working on or with the product.
Use this product only in accordance with the information provided in the enclosed documentation and with the locally
applicable standards and directives. Any other application may cause personal injury or property damage. Alterations
to the product, e.g. modifications or conversions, are only permitted with the express written permission of
SMA Solar Technology AG. Unauthorized alterations will void guarantee and warranty claims and will usually void the
operation license. SMA Solar Technology AG shall not be held liable for any damage caused by such alterations.
Any use of the product other than that described in the Intended Use section does not qualify as the intended use.
The enclosed documentation is an integral part of this product. Keep the documentation in a convenient place for future
reference and observe all instructions contained therein.
The type label must remain permanently attached to the product.
2.2 Safety Information
This section contains safety information that must be observed at all times during work on or with the product. To prevent
personal injury and property damage and to ensure long-term operation of the product, read this Section carefully and
observe all safety information at all times.
* In accordance with IEC 61439-1:2011
'$1*(5
Danger to life due to electric shock
High voltages are present in the NA-Box. Touching live components results in death or serious injury due to electric
shock.
• Disconnect the NA-Box and multicluster system from voltage sources before carrying out any work on the NA-Box
(see Section8, page22).
• Only operate the NA-Box with its protective cover in place.
• Work on the NA-Box may only be performed by qualified persons.
• Do not touch any live components in the NA-Box or any other components in the multicluster system.
&$87,21
Injury to persons or property damage due to unauthorized access
Unauthorized access or incorrect settings on the grid and PV system protection device in the NA-Box can cause grid
failures, yield losses, damage to the multicluster system or the NA-Box and injuries to persons. Furthermore,
the operating licence may also be revoked.
• Prior to commissioning the NA-Box, secure the grid and PV system protection device against unauthorized access.
The password protection must be activated on the grid and PV system protection device (see grid and PV system
protection device documentation).
• Only operate the NA-Box when the grid and PV system protection device is secured against unauthorized access.

SMA Solar Technology AG 2 Safety
Operating Manual NA-BOX-12-3-20-BE-en-11 9
&$87,21
Risk of injury if the NA-Box tips over
The NA-Box is heavy and may tip over if not properly fastened to the support surface. This can result in injuries due to
crushing.
• Upon installation, attach the NA-Box to the support surface.
&$87,21
Risk of burns due to hot components
Components and terminals inside the NA-Box can become hot during operation. Touching hot components can cause
burns.
• Only operate the NA-Box with its protective cover in place.
• Prior to removing the protective cover, let the NA-Box cool down.
Effects of an emergency disconnection
Emergency disconnection of the Sunny Island triggers the uncontrolled shutdown of the system, resulting in any
unsaved data being lost.
• Only use the emergency disconnection to avoid danger or consequential damage.
• In the event of an emergency disconnection, always check whether any fuse elements in the NA-Box, such as
circuit breakers, have tripped.
If any fuse elements have tripped, reactivate these fuse elements.

3 Scope of Delivery SMA Solar Technology AG
10 NA-BOX-12-3-20-BE-en-11 Operating Manual
3 Scope of Delivery
Check the scope of delivery for completeness and any externally visible damage. Contact your distributor if the scope of
delivery is incomplete or damaged.
Figure2: Components included in the scope of delivery
Position Quantity Designation
A1NA-Box
B 10 Strain relief with counter-sleeve (22 mm to 28 mm)
C 2 Fuse link 6 A, tripping characteristic: gG
D 2 Fuse link 1 A, tripping characteristic: gG
E 1 Operating manual and documentation for the grid and PV system protection device

SMA Solar Technology AG 4 Product Description
Operating Manual NA-BOX-12-3-20-BE-en-11 11
4 Product Description
4.1 NA-Box
The NA-Box is an automatic transfer switch and enables the operation of an SMA multicluster system on a utility grid in
accordance with the VDE-AR-N 4105 application regulations. In the event of a grid failure, the NA-Box disconnects the
SMA multicluster system from the utility grid via a redundant tie switch.
Figure3: NA-Box with cabinet door open
Position Designation Explanation
A Protective cover Prevents inadvertent contact with live components during
operation and thus protects from electric shocks. The protective
cover must always be in position when the NA-Box is in
operation.
B Fuse holder 6 A Receptacle for cylindrical thermal fuses (6 A, tripping
characteristic gG). The thermal fuses protect the connected
conductors from excessive heat build-up due to overload or short
circuits.
C Grid and PV system protection device External grid and PV system protection device which interrupts
the connection between the power generation system and the
electricity grid in the event of voltage- or frequency disturbances
via the control of a redundant tie switch.
The grid and PV system protection device monitors the utility grid
voltage and frequency for disturbances. If the values fall below
the lower limits or exceed the upper limits, the grid and PV system
protection device disconnects the power generation system from
the utility grid by opening the redundant tie switch.
The NA-Box is fitted with the grid and PV system protection device
manufactured by Bender GmbH & Co.KG.
D Test button for the tie switch The tripping mechanism of the tie switch must be tested regularly
for correct operation (see Section10.1, page28).
E Fuse holder 1 A Receptacle for cylindrical thermal fuses (1 A, tripping
characteristic gG). The thermal fuses protect the connected
conductors from excessive heat build-up due to overload or short
circuits.

4 Product Description SMA Solar Technology AG
12 NA-BOX-12-3-20-BE-en-11 Operating Manual
Residual-current device
Figure4: Overview of the residual-current device
F Residual-current device Protects against electric shock and is always used in addition to
existing protective measures such as insulation or protective
grounding.
A summation current transformer in the residual-current device
detects the electric currents in the conductors L1, L2, L3 and N.
In the normal operating state, the sum of these currents is zero.
Under fault conditions a differential current is formed which trips
the residual-current device. The residual-current device then
disconnects all poles of the loads.
Position Designation Explanation
A Test button The functionality of the residual-current device must be tested
regularly (see Section10.1, page28).
B Switch lever Top position: ON - residual-current device is switched on.
Bottom position: OFF - residual-current device has tripped or
is switched off.
Position Designation Explanation

SMA Solar Technology AG 4 Product Description
Operating Manual NA-BOX-12-3-20-BE-en-11 13
4.2 Type Label
The type label clearly identifies the product. The type label is located on the right-hand side of the enclosure.
You will find the following information on the type label:
• Address of SMA Solar Technology AG
• Device type (Type)
• Serial number (Serial No.)
• Article number (Art No.)
• Device-specific characteristics
You will require the information on the type label to use the product safely and when seeking customer support from
Service.
Symbols on the type label
Symbol Explanation
Danger to life due to high voltages
The product operates at high voltages. All work on the product must be carried out by qualified
persons only.
Risk of burns due to hot surfaces
The product can become hot during operation. Avoid contact during operation. Allow the product
to cool down sufficiently before carrying out any work. Wear personal protective equipment such as
safety gloves.
Observe the documentation
Observe all documentation supplied with the product.
WEEE designation
Do not dispose of the product together with the household waste but in accordance with the locally
applicable disposal regulations for electronic waste.
CE marking
The product complies with the requirements of the applicable EU directives.
Degree of protection
The product is protected against interior dust deposits and splashing water from all angles.

5 Installation SMA Solar Technology AG
14 NA-BOX-12-3-20-BE-en-11 Operating Manual
5 Installation
5.1 Storing the NA-Box
• Store the NA-Box in a dry place at an ambient temperature of between − 20°C and +50°C.
5.2 Requirements for Mounting
Mounting location
 A firm, even support surface, e.g., a concrete foundation, must be available for mounting.
 The mounting location must be suitable for the weight and dimensions of the NA-Box (see Section12 "Technical
Data", page34).
 The mounting location must be clear and safely accessible at all times without the need for any auxiliary equipment.
 The NA-Box must be mounted in a position that does not hinder access to the disconnection devices.
 All local requirements concerning minimum passage widths and escape routes must be observed.
 Climatic conditions must be met (see Section12 "Technical Data", page34).
 The mounting location must be below 2000 m above MSL. If you would like to use the NA-Box at altitudes above
2000 m, contact the SMA Service Line (see Section13, page37).
Minimum clearances
Figure5: Minimum clearances
 There must be sufficient space at the mounting location to ensure compliance with the minimum clearances.
 There must be a distance of at least 300 mm between the NA-Box and the Multicluster-Box. This will ensure
adequate heat dissipation.
Mounting position
Figure6: Permitted and prohibited mounting positions
 The mounting location must be suitable to ensure compliance with the permitted mounting position.

SMA Solar Technology AG 5 Installation
Operating Manual NA-BOX-12-3-20-BE-en-11 15
5.3 Preparing the Mounting Location
Dimensions of the drill holes for securing the NA-Box:
Figure7: Exterior base measurements and dimensions of the drill holes
Additionally required mounting material (not included in the scope of delivery):
 4 suitable screw anchors for attaching the NA-Box
Procedure:
1. On the support surface, mark the positions of the four drill holes for attaching the base.
2. Drill holes at the marked positions.
3. Insert the screw anchors.
5.4 Transport
5.4.1 Transport Options
The NA-Box is delivered on a Euro pallet. You can use the following means of transport to lift the NA-Box off the Euro
pallet:
•Forklift
• Crane with suitable crane fork
:$51,1*
Danger to life due to fire or explosion
Despite careful construction, electronic devices can cause fires if they are not installed properly. Contact with flammable
materials allows the fire to spread. This can result in death or serious injury.
• Do not install the NA-Box on flammable construction materials.
• Do not install the NA-Box in areas containing flammable substances or objects.
• Do not install the NA-Box in potentially explosive areas.

5 Installation SMA Solar Technology AG
16 NA-BOX-12-3-20-BE-en-11 Operating Manual
5.4.2 Transporting and Mounting the NA-Box
Additionally required mounting material (not included in the scope of delivery):
 4 suitable screws for attaching the NA-Box to the support surface
Procedure:
1. Remove all fastening screws from the kick plates at the front and rear (TX 30).
2. Remove the kick plates.
3. Retain the kick plates and the fastening screws for later use.
4. Push the means of transport under the NA-Box and transport the NA-Box to the mounting location.
:$51,1*
Danger of crushing if the raised or suspended NA-Box tips over or falls
The NA-Box can tip over or fall if it is lifted or transported carelessly or hastily. This can result in death or serious injury.
• Always transport the NA-Box as close to the ground as possible.
• Use a means of transportation that is suitable for the weight of the NA-Box of 103 kg.
• Transport the NA-Box in an upright position.
• Keep a safe distance from the NA-Box at all times during transport.
• Be aware of the center of gravity of the NA-Box. The center of gravity of the NA-Box is approximately in the center
of the cabinet and is marked on the packaging with the center of gravity symbol.
/05*$&
Damage to the NA-Box due to inappropriate transport
Setting the NA-Box down on uneven surfaces can lead to the NA-Box buckling and the doors no longer closing
properly. This can lead to moisture or dust penetrating the interior of the NA-Box.
• Do not set the NA-Box down on unpaved, uneven surfaces.
• Do not transport the NA-Box with the kick plates mounted.
5.
&$87,21
Risk of injury if the NA-Box tips over
The NA-Box is heavy and may tip over if not properly fastened to the support surface. This can result in injuries due
to crushing.
• Attach the NA-Box to the support surface using four suitable screws.

SMA Solar Technology AG 6 Electrical Connection
Operating Manual NA-BOX-12-3-20-BE-en-11 17
6 Electrical Connection
6.1 Overview of the Connection Area
6.1.1 Components and Terminals
Figure8: Overview of the Connection Area
Position Designation Explanation
ATerminals X210, X211 with spring-cage terminals For connecting the Multicluster-Box control
cables
B Surge arrester The signal light on the surge arrester must be
checked regularly (see Section10.2,
page29).
CTerminal X201:10 with spring-cage terminal NFor connecting the Multicluster-Box neutral
conductor
DTerminals X201:7-9 with spring-cage terminals L1, L2
and L3
For connecting the Multicluster-Box line
conductors
ETerminal X201:6 with spring-cage terminal PE For connecting the Multicluster-Box grounding
conductor
FTerminal X201:5 with spring-cage terminal PE For connecting the utility grid grounding
conductor
GTerminal X201:4 with spring-cage terminal NFor connecting the utility grid neutral
conductor
HTerminals X201:1-3 with spring-cage terminals L1,L2
and L3
For connecting the utility grid line conductors

6 Electrical Connection SMA Solar Technology AG
18 NA-BOX-12-3-20-BE-en-11 Operating Manual
6.1.2 Enclosure Openings in the Floor
Figure9: Position of the enclosure openings
6.2 Connecting the Multicluster-Box
Cable requirements:
 Conductor material: copper
 Conductor cross-section: 50 mm² to 150 mm²
 The power cables must be ground-fault- and short-circuit protected.
 The line conductors, neutral conductor and grounding conductor must have the same cross-section.
 The AC conductors and DC conductors must always be routed in separate cables.
Procedure:
1. Insert the power cables into the NA-Box (see Section9.3, page25).
2. Connect the grounding conductor to the spring-cage terminal PE at terminal X201:6 (see Section9.4.1, page26).
3. Connect the neutral conductor to the spring-cage terminal N at terminal X201:10.
4. Connect the line conductors to the spring-cage terminals L1, L2 and L3 at the terminals X201:7-9.
5. Ensure that a right-hand rotating magnetic field is present at the connection point of the Multicluster-Box.
6. Provide for strain relief of the power cables in the spring-cage terminal by attaching them to the appropriate cable
support rail. Use the strain reliefs and counter-sleeves included in the scope of delivery for this.
6.3 Connecting the Utility Grid
Cable requirements:
 Conductor material: copper
 The conductor cross-section must be selected according to the rated input power of the utility grid.
 Conductor cross-section: 50 mm² to 150 mm²
 The power cables must be ground-fault- and short-circuit protected.
 The line conductors, neutral conductor and grounding conductor must have the same cross-section.
 The AC conductors and DC conductors must always be routed in separate cables.
Position Explanation
A Enclosure openings for the control cables
B Enclosure openings for the Multicluster-Box power cables
C Enclosure openings for the utility grid power cables

SMA Solar Technology AG 6 Electrical Connection
Operating Manual NA-BOX-12-3-20-BE-en-11 19
Procedure:
1. Insert the power cables into the NA-Box (see Section9.3, page25).
2. Connect the grounding conductor to the spring-cage terminal PE at terminal X201:5 (see Section9.4.1, page26).
3. Connect the neutral conductor to the spring-cage terminal N at terminal X201:4.
4. Connect the line conductors to the spring-cage terminals L1, L2 and L3 at the terminals X201:1-3.
5. Ensure that a right-hand rotating magnetic field is present at the grid-connection point.
6. Provide for strain relief of the power cables in the spring-cage terminal by attaching them to the appropriate cable
support rail. Use the strain reliefs and counter-sleeves included in the scope of delivery for this.
6.4 Connecting the Control Cables
Assignment of spring-cage terminals with the control cables:
Figure10: Overview of the spring-cage terminals in the NA-Box
Cable requirements:
 Conductor material: copper
 Conductor cross-section: 1.5 mm² to 2.5 mm²
 The AC conductors and DC conductors must always be routed in separate cables.
Position Designation
A Multicluster-Box grounding contactor interlock (DC)
B NA-Box grid contactor feedback (DC)
C NA-Box voltage measurement (AC)
D Multicluster-Box generator contactor interlock (AC)
E NA-Box AC contactor 2 interlock (AC)
F NA-Box AC contactor 1 interlock (AC)
Ground connection at terminals X210 and X211
If the control cable between the Multicluster-Box and NA-Box contains a grounding conductor, the grounding
conductor terminal must not be connected on both sides.

6 Electrical Connection SMA Solar Technology AG
20 NA-BOX-12-3-20-BE-en-11 Operating Manual
Procedure:
1. Insert the control cables into the NA-Box (see Section9.3, page25).
2. Connect the control cables to the spring-cage terminals (see Section9.4.2, page27).
•X210:1,2: Multicluster-Box grounding contactor interlock
•X210:4,5: NA-Box grid contactor feedback
•X211:1-4: NA-Box voltage measurement
•X211:6,7: Multicluster-Box generator contactor interlock
•X211:8,9: NA-Box AC contactor 2 interlock
•X211:11,12: NA-Box AC contactor 1 interlock
3. Ensure that the insulated conductors are firmly in place.
6.5 Mounting the Kick Plates
Requirement:
 All installation work must be completed.
Procedure:
1. Ensure that the power cables are secured with a strain relief.
2. Insert the kick plates and attach using the fastening screws (TX 30, torque: 12 Nm).