SMA SB 3300-U User Manual
DC Disconnect Switch
For Sunny Boy 3300U/3800U Inverters
Installation Guide Version 1.1 DC-Discon-U-11:SE4406
TBE-DISCONU
SMA America, Inc.
Copyright © 2004 SMA America, Inc. All rights reserved.
All rights reserved. No part of this document may be reproduced, stored in a retrieval
system, or transmitted, in any form or by any means, electronic, mechanical,
photographic, magnetic or otherwise, without the prior written permission of SMA
America, Inc.
SMA America makes no representations, express or implied, with respect to this
documentation or any of the equipment and/or software it may describe, including
(with no limitation) any implied warranties of utility, merchantability, or fitness for any
particular purpose. All such warranties are expressly disclaimed. Neither SMA America
nor its distributors or dealers shall be liable for any indirect, incidental, or consequential
damages under any circumstances.
(The exclusion of implied warranties may not apply in all cases under some statutes,
and thus the above exclusion may not apply.)
Specifications are subject to change without notice. Every attempt has been made to
make this document complete, accurate and up-to-date. Readers are cautioned,
however, that SMA America reserves the right to make changes without notice and shall
not be responsible for any damages, including indirect, incidental or consequential
damages, caused by reliance on the material presented, including, but not limited to,
omissions, typographical errors, arithmetical errors or listing errors in the content
material.
Installation Guide DC-Discon-U-11:SE4406
SMA America, Inc.
DC-Discon-U-11:SE4406 Installation Guide
SMA America, Inc.
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Replacing the Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Installation Guide DC-Discon-U-11:SE4406
SMA America, Inc.
DC-Discon-U-11:SE4406 Installation Guide
SMA America, Inc.
IMPORTANT SAFETY INSTRUCTIONS
*Save These Instructions*
This manual contains important instructions for the DC Disconnect that must be followed
during the installation and use of the DC Disconnect.
The DC Disconnects are designed and tested according to international safety
requirements, but as with all electrical and electronic equipment, certain precautions
must be observed when installing the DC Disconnects. To reduce the risk of personal
injury and to ensure the safe installation and operation of the DC Disconnects, you must
carefully read and follow all instructions and warnings in this Installation Guide.
Safety and Hazard Symbols
This symbol is used to call attention to important information that you
must have when installing and/or operating a DC Disconnect. Failure
to read and follow instructions marked with this symbol could result in
serious injury and/or damage to the equipment.
This symbol appears beside instructions and warnings that deal with
dangerous voltages that can injure people who come in contact with
them.
Warnings
WARNING: A Warning describes a hazard to equipment or
personnel. It calls attention to a procedure or practice which, if not
correctly performed or adhered to, could result in damage to or
destruction of part or all of the SMA equipment and/or other
equipment connected to the SMA equipment or personal injury.
Warnings may also be accompanied by one or more of the safety and hazard symbols
described above to indicate the type of hazard described therein.
Other Symbols
In addition to the safety and hazard symbols described previously, the following symbol
is also used in this Installation Guide:
This symbol accompanies notes that call attention to supplementary
information that you should know to ensure optimal operation of the
system.
Installation Guide DC-Discon-U-11:SE4406 1
SMA America, Inc.
Warranty
All DC Disconnects sold in the USA have a five-year warranty, as indicated on the
warranty card included in the shipping container. For warranty coverage, or if you
have questions about the DC Disconnect warranty, contact SMA America at the mailing
address, email address, telephone number, or Web site listed in the Contact section of
this manual.
WARNING: All electrical installation must be done in accordance
with the National Electrical Code ANSI/NFPA 70, local building
codes and the requirements of the authority having jurisdiction.
To prevent electrical shock or injury, all wiring and commissioning
procedures must be performed only by qualified personnel.
WARNING: Before installing or using the DC Disconnect, read all
of the instructions and warnings regarding the DC Disconnect in
this Installation Guide.
WARNING: PV arrays produce electrical energy when exposed
to light and thus create an electrical shock hazard. Ensure that
there is no AC or DC voltage present when you install the DC
Disconnect.
Make sure that there is no DC and no AC voltage present before
you remove the cover of the DC Disconnect.
This GROUND symbol marks areas in the DC Disconnect that are
used for connecting equipment grounds only.
2 DC-Discon-U-11:SE4406 Installation Guide
SMA America, Inc. Introduction
1 Introduction
SMA America’s DC Disconnect integrates PV series string fuses into a standard heavyduty DC disconnect switch.
DC Disconnect features include:
• Visible position, lockable DC disconnect switch
• Four 15A, 600 VDC Fuses (included)
•NEMA 3R enclosure
To prevent electrical shock or injury, all wiring and commissioning
procedures must be performed only by qualified personnel.
WARNING: All electrical installation must be done in accordance with
the National Electrical Code ANSI/NFPA 70, local building codes and
the requirements of the authority having jurisdiction.
WARNING: PV arrays produce electrical energy when exposed
to light and thus create an electrical shock hazard.
Application
The DC Disconnect is designed for use with the SB3300U or the 3800U inverters. Use
of the DC Disconnect for other applications is not recommended nor supported by SMA
America.
Installation Guide DC-Discon-U-11:SE4406 3
Introduction SMA America, Inc.
4 DC-Discon-U-11:SE4406 Installation Guide
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