•
that use less energy, improve power reliability and make the places we live and work safer and more comfortable
•
that enable machines to deliver more productivity without wasting power
•
that make aircraft lighter, safer and less costly to operate, and help airports operate more efficiently
•
that deliver more power to cars, trucks and buses, while reducing fuel consumption and emissions
As a global power management company, we help customers worldwide manage the power needed for buildings, aircraft, trucks, cars, machinery and businesses.
Eaton’s innovative technologies help customers manage electrical, hydraulic and mechanical power more reliably, efficiently, safely and sustainably.
We provide integrated solutions that help make energy, in all its forms, more practical and accessible.
With 2013 sales of $22 billion, Eaton has approximately
100,000 employees around the world and sells products in more than 175 countries.
Eaton.com
2 EATON DC Combiner box and AC solutions

Bussmann, a division of Eaton, is the leading source of circuit protection solutions in the global marketplace.
Bussmann products are approved for use around the world and meet agency requirements and international standards: IEC, VDE, DIN, CCC, UL, CSA,
BS and others.
Bussmann global headquarters are in
St Louis, Missouri (US), the European headquarters are in Burton-on-the-
Wolds, Leicestershire (UK), and Asia-
Pacific based in Shanghai. Bussmann manufactures over 50,000 unique parts covering extensive circuit protection solutions for a wide range of applications and markets, including: utility, industrial, renewable energy, automotive and hybrid electric vehicles and rail applications.
Drawing on a hundred years of fuse design and expertise, Bussmann has been at the forefront of the solar
PV market as it has evolved to become a mature sustainable and adaptive technology.
PV systems, as with all electrical power systems, must have appropriate protection to ensure safe reliable operation. Throughout this evolution
Bussmann has worked closely with solar system manufacturers and through coordinated research and development has produced revolutionary new fuse links, surge protection devices and integrated solutions to ensure people, property and payback are protected.
As a leading exponent in the design, development and manufacture of overcurrent protection, the Bussmann team of specialist engineers play a leading role in international standardisation of photovoltaic fuse links, offering comprehensive advice on selection and applications
With a global manufacturing footprint and a continual commitment to meet our customers’ needs Bussmann continues develop innovative highquality products for the PV market, protecting tomorrows’ future, today.
EATON DC Combiner box and AC solutions 3

Due to their small size, system protection is often overlooked within residential PV installations. On the contrary adequate protection of the DC and AC circuits in residential installations is just as critical as in much larger systems. Typically made of one or two strings of eight modules, high voltage DC cables may be run throughout the residential building; here it is critical to protect people and property from fi re and death in the event of accidental damage or system failure.
Residential installations < 50kW
• Combiner box
• SPD
• Switch
• Inline fuse holder
• Fireman’s switch
4 EATON DC Combiner box and AC solutions

Residential combiner box
For residential systems where inline fuses are used a simple two string combiner box with DC isolation and PV surge protection can be custom designed in a convenient compact unit.
Standards
Number of strings
Voltage
Fuse
DC load isolation
Overvoltage protection
* Typical confi guration
IEC 61439-1, IEC 61439-2 and IEC 60363-7-712
2*, 3, 4 up to 1000 Vdc
Optional 10x38 gPV 8 to 12A*
Recommended 25 Adc* to 63 Adc
PV T2*
DC overvoltage protection
Integrated as part of the residential combiner box or installed separately, the DC surge protection device
(SPD) protects against damaging voltage surges typically caused by indirect or direct lightning strikes.
Standards
SPD test class
Voltage
Short circuit current rating I scpv
Max discharge current In (8/20)μs
Lightning impulse current I imp
(10/350)μs
* Typical confi guration
EN 50539-11
PV T2*
600 Vdc*, 1000 Vdc
160 Adc*
-
40 kA*
EN 50539-11
PV T1/T2
600 Vdc, 1000 Vdc
1000 Adc
40 kA
5 kA
10x38 mm photovoltaic fuse links
The Bussmann range of photovoltaic fuse links are specifi cally designed to provide high quality protection and isolation for photovoltaic installations ether at string level or within the combiner box.
Standards
Voltage
Operating Class
Current Ratings
Size
* Typical values
IEC 60269-6, UL 2579, CSA, CCC (1-15A), RoHS compliant
1000Vdc gPV
1 – 6A, 8A, 10A*, 12A*, 15A, 20A, 25A
10x38mm
Fireman’s switch
The PV Fireman’s switch is a DC switch disconnector that isolates the lines between the solar modules and the inverter. With the option for remote and under-voltage operation the PV Fireman’s switch enables fi refi ghters to safely isolate the DC lines in the event of a fi re.
Standards
Voltage
Number of switches
Switch rating
Inputs/Outputs
Terminal type
* Typical values
IEC/EN 60947-3
1000Vdc
1*
30A
1 in*/1 out*, 2 in/2 out
MC4* or M12 gland
Inline fuse holder
Ideal for residential systems of only one or two strings the Bussmann Inline fuse holder is a single pole, non-serviceable PV fuse and fuse holder assembly in an IP67 dust tight and temporary water immersion resistant housing for use in PV wire harnesses.
Standards
Voltage
Fuse
Current Ratings
IP protection
Terminals
* Typical values
CE (IEC 60269-6 fuse), UL , CSA Component Acceptance
1000Vdc gPV 10x38mm
1 – 6A, 8A, 10A*, 12A*, 15A, 20A, 25A
IP67
Crimp connection for single/stranded 12-10AWG PV cable
EATON DC Combiner box and AC solutions 5

As PV installations become larger, typically found in commercial rooftop systems, designing the correct PV protection becomes more important. Typically ranging from 50kW to a few Mega
Watts these systems require careful consideration to ensure that they have correct protection and meet national and local codes for installation and connection to the grid.
Commercial installations 50kW to 1MW
• Combiner box
• Fireman’s switch
• G59 AC Panel 50kW
• Eaton’s engineering services
6
Eaton’s Electrical Services & Systems team offers a comprehensive portfolio of services tailored for every stage of a power system’s life cycle – whether it’s design, build, or support.
Our services integrate and optimize the elements of a power system to make sure it’s aligned with business goals. We can help keep your power system safe, effi cient, reliable, and up-to-date.
EATON DC Combiner box and AC solutions

Commercial combiner box
In commercial installations a small number of PV strings may be combined before being input into a string inverter, this is particularly the case for thin-fi lm module based systems. Here for example
Bussmann by Eaton can confi gure a three or four string combiner box to include gPV string fuses, DC isolation, and T2 or T1/T2 surge protection devices.
Standards
Number of strings
Voltage
Fuse
DC load isolation
Overvoltage protection
Terminal type
IP protection
Enclosure
* Typical confi guration
IEC 61439-1, IEC 61439-2 and IEC 60363-7-712
2, 3, 4* up to 1000 Vdc
10x38 gPV 8 to 12A*
25 Adc to 63* Adc
PV T2*
MC4 connectors*, M16 glands
IP65
GRP* with transparent*/opaque lid and IP65 breather vent
Overvoltage protection
Owing to the increased size and complexity of commercial PV installations it is important to ensure both
AC and DC overvoltage protection is carefully considered and the right protection selected to prevent damage in the event of an indirect or direct lightning strike.
Standards
SPD test class
Confi guration
Voltage
Short circuit current rating I scpv
Max discharge current In (8/20)μs
EN 50539-11
PV T2*, PV T1/T2
2 pole + PE
600, 1000* Vdc
160*, 1000 Adc
40 kA*
EN 61643-11/IEC 61643-1
T1, T1/T2, T2
1, 2, 3, 4 Pole, 1+NPE, 3+NPE
75 – 580 Vac, 280* Vac
-
35kA (T1), 50 kA (T1/T2)
40 kA (T2) (30 kA - 75 Vac T2)
35 kA (T1), 12.5 kA (T1/T2) Lightning impulse current I imp
(10/350)μs
* Typical confi guration
5 kA (PV T1/T2)
Fireman’s switch
In some markets national and local installation requirements may require the installation of a DC isolating Fireman’s switch. In this case the Eaton Fireman’s switch can be confi gured in larger switch-disconnector combinations necessary for commercial installations. With remote operation and under-voltage release the individual strings can be fed separately into the string inverter helping to optimise inverter performance.
Standards
Voltage
Number of switches
Switch rating
Utilization category
Inputs/Outputs
Terminal type
IP protection
* Typical confi gurations
IEC/EN 60947-3
1000 Vdc
2, 3, 4*, 6
30 A each input
DC-21A
2 in/2 out, 3 in/3 out, 4 in*/4 out*, 6 in/6 out
MC4* or M12 gland
IP65
AC side grid and systems protection
As PV systems become larger it is important to meet the national and local requirements for export to the grid, here Eaton has a number of customisable solutions to meet these requirements. For the UK a
G59 distribution panel can be confi gured with integrated G59 relay and contactor as well as options for power metering and incoming AC MCBs. Similarly for Germany a VDE-AR-N 4105 preconfi gured unit can be supplied in a number of rating classes from 43 to 100k VA.
Standards
Rated output
G59
As required. Typically <500kW
Rated operating voltage 230/400 Vac
Monitoring relay G59/3 relay
Contactors 4 pole, rated to suit system
Terminal type
Metering
Isolator
* Typical confi gurations
Dependent upon cable size
Multi-function energy meter, MID certifi ed with RS485 & pulse o/p
4 pole, rated to suit system
VDE-AR-N 4105
43, 55, 86, 100k VA
230/400 Vac
Yes
2 (DILMP series)
EATON DC Combiner box and AC solutions 7

For large scale ground mount utility PV systems the challenges of providing the correct type and level of system protection becomes ever more critical as system voltages and operating currents are typically signifi cantly higher. Spread out over large areas, with export powers typically in the magnitude of 10’s of MW these large scale solar farms represent signifi cant fi nancial investments for the owners and operators. For this reason it is critical to ensure safe and reliable operation of the DC, LV and MV circuits within these systems as well as meeting local and national codes for connection to the grid.
Utility installations > 1MW
• Combiner box
• Fireman’s switch
8
Eaton’s Electrical Services & Systems team offers a comprehensive portfolio of services tailored for every stage of a power system’s life cycle – whether it’s design, build, or support.
Our services integrate and optimize the elements of a power system to make sure it’s aligned with business goals. We can help keep your power system safe, effi cient, reliable, and up-to-date.
EATON DC Combiner box and AC solutions

Utility combiner box
For utility scale PV systems the fully customisable Bussmann by Eaton combiner box solution comes into its own with numerous options for the number of input strings, gPV fuse ratings, and options for full system monitoring of individual sting currents and system voltage, power supplies and surge protection for DC, AC and communications. Using dedicated design rules the Bussmann by Eaton engineers tailor the solution specifi c to the installation to ensure all levels of protection are covered.
Standards
Number of strings
Voltage
Fuse
DC load isolation
Overvoltage protection:
DC PV SPD
AC SPD±
Data line SPD±
Monitoring±
String current
Power supply
Communication
Terminal type
IP protection
Enclosure
* Typical confi guration
± Monitored combiner boxes only
IEC 61439-1, IEC 61439-2 and IEC 60363-7-712
2 – 32 strings (20A fuse max), 2 – 16 strings (32A fuse max), 16 string* up to 1000 Vdc
10x38 gPV 1 to 32A, 16A*
25 Adc to 500 Adc, 250 Adc*
PV T2*, PV T1/T2, remote indication±
280 Vac T2, 1 pole, 2 pole or 1+NPE, with remote indication
24 V D1/C2
8, 16, 24 string shunt based monitoring
External 24 Vdc, Internal 240 Vac to 24 Vdc, Internal 1000 Vdc to 24 Vdc
RS-485 2-Wire Modbus
Bottom or side entry MC4 connectors*, M16 glands
IP65*, IP55 with IP55 vents
GRP* with transparent*/opaque lid and IP65 breather vent
XL square body and NH photovoltaic fuse links
The Bussmann range of XL square body and NH photovoltaic fuse links are specifi cally designed to provide reliable DC overcurrent protection needed for the demanding conditions of utility scale PV farms.
Typically used in re-combiners and inverters these fuse links are capable of interrupting low overcurrents associated with faulted PV systems.
Standards IEC 60269-6, UL 2579, RoHS compliant,
CSA (NH only), CCC pending
Sizes
Voltage
Current rating
01XL, 1XL, 2XL, 3L
1000, 1100, 1200, 1500 Vdc
50 to 600A
Operating Class gPV (UL PV)
Indication
Accessories
Top indication
Microswitches, XL fuse holders
NH1, NH2, NH3
1000 Vdc
32 to 400A gPV (UL PV)
Dual indication
Microswitches, NH fuse holders
Medium voltage switchgear Xiria ring main unit
The Xiria Ring Main Unit system is metal enclosed and air insulated, equipped with load-break switches and circuit breakers for 12kV-20kA and 24kV-16kA networks.
They operate with a combination comprised of circuit breakers and electronic relays and feature high level of operational safety and a compact design. A variety of options are available including an extensible version.
Eaton’s full range of SF6-free medium voltage switchgear systems provide an opportunity to make an active contribution to reducing the worldwide emissions of SF6-gas.
EATON DC Combiner box and AC solutions 9

PV system overview
Eaton can offer a comprehensive range of products for safe, reliable and sustainable PV systems within residential, commercial and utility sectors. Drawing on a hundred years of design and expertise the
Bussmann by Eaton combiner box can be confi gured as a simple 2 string unit for residential systems, up to 34 strings with monitoring for utility scale systems.
With a focus on reliability and safety the Bussmann by Eaton combiner box solution has been designed with superior thermal characteristic making it suitable for a range of environments with ambient temperatures up to 50°C. Independent, third party testing and certifi cation by TUV Rheinland gives additional peace of mind that the product is fully compliant to IEC standards IEC 61439-1, IEC 61439-2 and IEC 60364-7-712.
With a global manufacturing footprint and local support, Eaton can meet the needs of PV installations large and small throughout the world.
Feature
Custom design solution
TUV Rheinland tested and certifi ed
Superior thermal design
Industry leading internal components
Global manufacturing footprint
Terminal type
IP protection
Enclosure
Benefi t
Meets the needs any PV installation
Reassurance in design reliability and safety
Reliability in harsh environments up to 50°C
Confi dence from 1000’s MWh of global use
Local support and reduced time frames
MC4 connectors*, M16 glands
IP65
GRP* with transparent*/opaque lid and IP65 breather vent
1 Residential combiner box
2 DC overvoltage protection
3 10x38 PV fuse links
4 Single fi reman's switch
5 Inline fuse holder
6 Commercial combiner box
7 AC Overvoltage protection
8 Multiple fi reman's switch
9 AC side grid protection
10 Utility combiner box
11 XL & NH PV fuse links
12 LV & MV switchgear
13 Eaton's Electrical Services & Solutions
Residential installations
Commercial installations
Utility installations
10 EATON DC Combiner box and AC solutions

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EATON DC Combiner box and AC solutions 11

At Eaton, we’re energized by the challenge of powering a world that demands more. With over 100 years experience in electrical power management, we have the expertise to see beyond today. From groundbreaking products to turnkey design and engineering services, critical industries around the globe count on Eaton.
We power businesses with reliable, efficient and safe electrical power management solutions. Combined with our personal service, support and bold thinking, we are answering tomorrow’s needs today. Follow the charge with Eaton. Visit eaton.com/electrical.
Eaton’s Bussmann Business
Cooper Bussmann (UK) Ltd
Melton Road
Burton-on-the-Wolds
LE12 5TH
United Kingdom
Tel: +44 (0)1509 882 600
Fax: +44 (0)1509 882 786
Email: bulesales@eaton.com
www.bussmann.com
Customer Support Centre
Eaton Electric Limited
Grimshaw Lane
Middleton
Manchester
M24 1GQ
United Kingdom
Tel: +44 (0)8700 545 333
Fax: +44 (0)8700 540 333
Email: ukcommorders@eaton.com
www.eaton.eu
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Electrical Sector EMEA
Route de la Longeraie
71110 Morges, Switzerland
Eaton.eu
© 2014 Eaton
All Rights Reserved
Printed in UK
Publication No. BR132004EN
October 2014
Changes to the products, to the information contained in this document, and to prices are reserved; so are errors and omissions.
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