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For Eaton’s Bussmann series product information, call 400 629 1869 or visit Eaton.com/bussmannseries
Basic information
Part number EBU3075-xxx
Rated voltage 750V dc
Rated current 400A -1000A
Breaking capacity Max. 100kA
Min. 300%In
Altitude 2000-5000m (Derating)
RoHS compliant
Transportation
During transportation, it shall be rainproof, moisture-proof to avoid severe ground vibration and impact.
Temperature
Normal condition -5
oC～40oC
Allowed condition (Derating) -40oC～100oC
During the rated current test of the fuse, it shall be separately installed in the natural air without ventilation, and there shall be no other heating parts or heat dissipation parts within 1m except the connecting
wires. When the fuse operates above 20 oC , the rated current needs additional correction.
Altitude
Normal condition lower than 2000m
Allowed condition (Derating) 2000-5000m
Parameter correction of altitude change: higher altitude mainly leads to insulation deterioration, heat dissipation condition deterioration and air pressure change.
Features
? Higher voltage rating provides overall system efficiency using smaller, more economical conductors while
meeting the needs of higher voltage battery packs.
? Higher interrupting rating protects high capacity battery packs needed for vehicle acceleration and range
requirements.
? Up to ten times faster opening under high fault current conditions helps assure reliable protection of circuits
and components.
This document is intended to clearly present comprehensive product data and provide technical information that will help the end user with design applications. Eaton reserves the right,
without notice, to change design or construction of any products or discontinue or limit distribution of any products. Eaton also reserves the right to change or update, without notice, any
technical information contained in this document. Once a product has been selected, it should be tested by the user in all possible applications. The information contained in this document is
correct at the time of publication, but we reserve the right to supply products differing in construction or performance.
Version 0.4 Dec 16, 2025
For Eaton’s Bussmann series product information, call 400 629 1869 or visit Eaton.com/bussmannseries
Dimension: (mm)
Technical parameter
Part Number Voltage Rating
(V dc)
Current Rating
(A)
Pre-arcing I2
t
(kA2
s)
Total I2
t
(kA2
s)
Power Loss
at In (W)
EBU3075-400 750 400 28 188 108
EBU3075-500 750 500 37 154 136
EBU3075-630 750 630 64 266 165
EBU3075-700 750 700 83 347 178
EBU3075-800 750 800 112 472 200
EBU3075-900 750 900 123 517 235
EBU3075-950 750 950 149 625 285
EBU3075-1000 750 1,000 177 744 335
This document is intended to clearly present comprehensive product data and provide technical information that will help the end user with design applications. Eaton reserves the right,
without notice, to change design or construction of any products or discontinue or limit distribution of any products. Eaton also reserves the right to change or update, without notice, any
technical information contained in this document. Once a product has been selected, it should be tested by the user in all possible applications. The information contained in this document is
correct at the time of publication, but we reserve the right to supply products differing in construction or performance.
Version 0.4 Dec 16, 2025
For Eaton’s Bussmann series product information, call 400 629 1869 or visit Eaton.com/bussmannseries
T-C curve
This document is intended to clearly present comprehensive product data and provide technical information that will help the end user with design applications. Eaton reserves the right,
without notice, to change design or construction of any products or discontinue or limit distribution of any products. Eaton also reserves the right to change or update, without notice, any
technical information contained in this document. Once a product has been selected, it should be tested by the user in all possible applications. The information contained in this document is
correct at the time of publication, but we reserve the right to supply products differing in construction or performance.
Version 0.4 Dec 16, 2025
Appendix 1: Rated current dimensioning factors
The fuse’s rated current is the RMS
current it can continuously carry
without degrading or exceeding the
applicable temperature rise limits
under well defined and steady-state
conditions. This is in contrast to
semiconductors, whose rated current
is given as a mean or average value.
Many conditions can effect the current carrying capability a fuse and
to prevent premature ageing, following will allow the rated current selection to be on the safe side.
Basic selection
This part covers the basic selection criteria
for only the fuse’s rated current and not the
influence from overload and cyclic loading.
The actual RMS steady-state load current
passing through the fuse should be lower
or equal to the calculated maximum permissible load current called Ib.
Ib = In x Kt x Ke x Kv x Kf x Ka x Kb
Ib
The max permissible continuous RMS load
current*
In
Rated current of a given fuse
Kt
Ambient temp. correction factor per Fig. 1
Ke
Thermal connection factor per Fig. 2
Kv
Cooling air correction factor per Fig. 3
Kf
Frequency correction factor per Fig. 4
Ka
Correction for high altitude
Kb
Fuse load constant. For fuses with porcelain
body it is normally 1.0 (see data sheet) For
fiber body fuses the factor is normally 0.8
In case of water cooled fuse terminals,
please consult Eaton’s application engineering bulehighspeedtechnical@eaton.
com
*
NB: For any periods of 10 minutes duration or more the RMS-value of the load
current should not exceed this.
The maximum current density of the busbars on which the fuses are mounted
should be 1.3A/mm2 (IEC 60269 part 4
defines 1.0 to 1.6/mm2
). If the busbars
carry a current density more than this then
the fuse should be derated.
For example, a 200A square body fuse is
mounted onto a busbar with a cross sectional area of 120mm2
. For a 200A fuse the
minimum cross sectional area of the busbar
to meet the 1.3A/mm2 requirement should
be 154mm2
(200A/1.3A/mm2
). As the actual
busbar size is only 78 percent (120mm2
/
154mm2
) of the recommended size, the
fuse must be derated.
If two connections are not equal, the respective Ke factor can be found using the
following formula: (K1 + K2)/2.
Fuse mounting inside the box etc., will
reduce the convection cooling compared
with the IEC conditions.
An additional Ke factor should be chosen
here based on judgement. Often, box
mounted fuses are given an additional Ke
factor of 0.8.
Fuses under high frequency load (like in
voltage commutated inverters) call for special attention. At these frequencies, the
current carrying capability can be reduced
due to the imposed skin and proximity effect on the current-carrying elements inside
the fuse. Using the curve given in Fig. 4
normally ensures a sufficient margin.
When fuses are used at high altitudes there
is reduced cooling effect on the fuse as the
density of the atmosphere reduces.
Correction Ka should be applied to the
fuse’s continuous rating when the application is above 2000m:
Where:
I = Current rating at high altitude
In = Rated current of a given fuse
h = Altitude in meters.
Figure 1 This curve shows the influence of the ambient temperature on the
fuse’s current-carrying capability.
Figure 2
Figure 3 The curve shows the influence of forced air cooling on the fuse.
Figure 4
For Eaton’s Bussmann series product information, call 400 629 1869 or visit Eaton.com/bussmannseries
Mounting alignment
Eaton's Bussmann series high speed fuses are generally supplied in a ready-to-install condition.
The fuses are not meant as mounting isolators. Excessive tension, compression and torque from misalignment between fuse and busbars (see example below)
should be avoided. If possible, mounting should starting with the fuse followed by the necessary adjustment
and tolerance utilization of busbar components.
Surface material
The electrical conducting metal parts of Eaton’ s
Bussmann series high speed fuses are usually plated
to maintain an acceptable surface condition. Tin is the
most common material for the fuse contacts today.
Most of Eaton’ s Bussmann series high speed fuse
contact surfaces are electro-plated with a 5μm layer of
tin. This plating provides an excellent electrical and
thermal interface with holders or cables/busbars of either pure copper or copper/aluminum plated with tin/
nickel or silver．
Many tests and more than 30 years of experience have
shown that a tin, nickel or silver-plated surface is both
mechanically and electrically stable in the entire temperature high speed fuse temperature range (typical
maximum temperature rise of 130°C).
Vibration and shock resistance
High speed fuses should not be submitted to excessive
vibration. However, standard high speed fuses can withstand vibration with a maximum 5g magnitude for a longtime basis and 7g for short periods (shocks). Before using
fuses in applications with stronger vibration, consult
Eaton's application engineering:
bulehighspeedtechnical@eaton.com.
Service and maintenance
The following points should be observed and checked
during maintenance of electrical cabinets and switchgear.
1. Check tightening torques and examine ceramic
fuse bodies for visible cracks. Tighten or replace as
needed.
2. Check all fuse indicators. In case of any fuse opening, replace all opened AND unopened fuses that
have been subjected to the same the fault current or
a part of it. Even if the resistance (W) of the unopened fuses is unchanged, the fuses may be damaged by the fault current and must be changed to
avoid nuisance openings.
Environmental issues
Generally, high speed fuses are made from the following
basic materials:
? Ceramic
? Fiberglass
? Silver
? Copper
? Brass
? Steel
? Silica sand
Accessories like micro switches and fuse holders are
partly made of various plastic materials. For further information on fuse materials, contact Eaton's application engineering:
bulehighspeedtechnical@eaton.com.
Storage
Fuses should be stored in a dry warehouse or shelf, keep
away from water. The storage temperature of the products is –40°C to +85°C, the relative humidity is less than
70%, and there is no condensation. In addition, they must
be stored in a non corrosive environment. Any fuse submerged in water or sprayed can no longer be used, and
any fuse exposed to fire of other forms of overheating can
no longer be used.
Tin-plated contacts
Concentration - Duration
PPM - h According to standard
H2O 12,5ppm-96h IEC 68-2-43 Kd
SO2 25ppm-504h IEC 68-2-42 Kd
Appendix 2
Installation, service, maintenance, environmental and storage
issues
For Eaton’s Bussmann series product information, call 400 629 1869 or visit Eaton.com/bussmannseries
Temperature
Operating ambient temp –40°C to +100°C
When the fuse operates above 20°C, the rated current
need additional correction.
