LV HRC fuse links 45Fuse links from 2 A to 1250 A for
selective line protection and system
protection in non-residential buildings,
industry and power utilities.
IEC 60269-1, -2;
EN 60269-1;
DIN VDE 0636-2;
CSA 16325 - 1422-02
✓✓✓
Residential
buildings
Industry
LV HRC signal detectors 68Signal detectors for when a fuse is
LV HRC fuse bases and
accessories
SITOR semiconductor fuses
LV HRC design78Fuse links in LV HRC design and a
Cylindrical fuse design
NEOZED and DIAZED design
tripped on all LV HRC fuse links with
combination or front indicators with
non-insulated grip lugs.
Plus the comprehensive accessory
range required for LV HRC fuse
systems.
69Fuse bases for screw or snap-on
mounting onto standard mounting rails,
available as 1-pole or 3-pole version.
huge variety of models support a wide
range of applications from 500 V to
1500 V and 150 A to 1600 A.
Fuses with slotted blade contacts,
bolt-on links or female thread, and
special designs.
147Fuse links, fuse holders – usable as
fuse switch disconnectors and fuse
bases up to 600/690 V AC and
400/700 V DC from 1 A to 100 A
in the sizes 10 × 38 mm, 14 × 51 mm
and 22 × 58 mm.
168NEOZED fuse links for 400 V AC and
250 V DC and DIAZED for 500 V AC
and 500 V DC.
--✓✓✓
IEC 60269-1, -2;
EN 60269-1;
DIN VDE 0636-2
UL 4248-1,
File No. E171267-IZLT2
(only downstream from
branch circuit protection)
CSA C22.2
No. 4248.1-07
UL 4248-13, File No.
E167357-JFHR2
Fuse links:
UL 4248-13, File No.
E167357-JFHR2
CSA 248170, 1422-30
PV cylindrical fuses186Fuses with a rated voltage of
PV cumulative fuses
1000 V DC and operational class gPV
for the protection of photovoltaic
modules, their connecting cables
and other components.
191Fuses with a rated voltage of 1000 V
and 1500 V DC, a rated current of 63 A
to 630 A and operational class gPV for
the protection of connecting cables and
other components.
IEC 60269-6 ✓✓✓
IEC60269-6✓✓✓
Siemens · 10/2015
3
Fuse Systems
Introduction
■
Overview
Rated voltage U
The rated voltage is the designated voltage of the fuse and is
used to determine its test conditions and operational voltage
limits.
For LV HRC and SITOR fuse links, the rated voltage is always the
rms value of an AC voltage.
For wind power plants and some industrial applications, a higher
voltage tolerance is demanded of the LV HRC and SITOR fuses
than the tolerance of +5 % defined in the standard. On request,
you can obtain a manufacturer's declaration for the rated voltage
of 690 V +10 %.
In the case of NEOZED and DIAZED fuse links, a distinction is
made between AC and DC voltage values.
Rated current I
The rated current of a fuse link is the designated current of the
fuse link and is the current up to which it can be continuously
loaded under prescribed conditions without adverse affects.
Rated frequency
The rated frequency is the frequency for which the fuse link
is rated with regard to power dissipation, current, voltage,
characteristic curve and breaking capacity.
Selectivity
Several fuses are usually connected in series in a system. Selectivity ensures that only the faulty electric circuit and not all operating processes are interrupted in a system in serious cases.
Siemens fuses of operational class gG, at an operational voltage
of up to 400 V AC and a ratio of 1:1.25, are interselective, i.e.
from rated current level to rated current level. This is achieved by
means of the considerably smaller band of scatter of ± 5 % of
the time/current characteristics, which far exceeds the demand
for a ratio of 1:1.6 specified in the standard.
It is therefore possible to use smaller conductor cross-sections
due to the lower rated currents.
Breaking capacity
The rated breaking capacity is the highest prospective shortcircuit current I
conditions.
A key feature of these fuses is their high rated breaking capacity
with the smallest footprint. The basic demands and circuit data
for tests – voltage, power factor, actuating angle, etc. – are
specified in both national (DIN VDE 0636) and international
(IEC 60269) regulations.
However, for a constant fail-safe breaking capacity, from the
smallest non-permissible overload current through to the highest
short-circuit current, a number of quality characteristics need to
be taken into account when designing and manufacturing fuse
links. These include the design of the fuse element with regard
to dimensions and punch dimension and its position in the
fuse body, as well as its compressive strength and the thermal
resistance of the body. The chemical purity, particle size and
the density of the quartz sand also play a key role.
The rated breaking capacity for AC voltage for NEOZED fuses –
and the majority of DIAZED fuses – is 50 kA, and in the case of
our LV HRC fuses (NH type), it is even 120 kA. The various type
ranges of SITOR semiconductor fuses have different switching
capacities ranging from 50 to 100 kA.
Faster arcing and precise arc quenching are the requirements for a
reliable breaking capacity.
Operational classes
Fuses are categorized according to function and operational
classes. The first letter defines the function class and the second
the object to be protected:
1st letter
a = Partial range protection
Fuse links that carry currents at least up to their specified rated
current and can switch currents above a specific multiple of their
rated current up to their rated breaking current.
g = Full range protection
Fuse links that can continuously carry currents up to at least their
specified rated current and can switch currents from the smallest melting current through to the breaking current. Overload
and short-circuit protection.
2nd letter
G= Cable and line protection
M= Switching device protection in motor circuits
R, S = Semiconductor protection/thyristor protection
L= Cable and line protection
B= Mine equipment protection
Tr= Transformer protection
The designations "slow" and "quick" still apply to DIAZED fuses.
These are defined in IEC/CEE/DIN VDE.
In the case of "quick" characteristics, the fuse blows in the breaking range faster than those of operational class gG.
In the case of DIAZED fuse links for DC railway network protection, the "slow" characteristic is particularly suitable for switching
off direct currents with greater inductance. Both characteristics
are also suitable for the protection of cables and lines.
Full range fuses (gG, gR, quick, slow) reliably break the
current in the event of non-permissible overload and shortcircuit currents.
Partial range fuses (aM, aR) exclusively serve short-circuit
protection.
The time/current characteristic curve specifies the virtual time
(e.g. the melting time) as a function of the prospective current
under specific operating conditions.
Melting times of fuse links are presented in the time/current
diagrams with logarithmic subdivision as a function of their currents. The melting time characteristic curve extends from the
lowest melting current, which still just causes the melting conductor to melt asymptotically to the I
values in the range of higher short-circuit currents, which specifies the constant melting heat value I
the time/current characteristics diagrams omit the I
9
10
[s]
t
5
10
a
2
t line of equal Joulean heat
2
t. For the sake of simplicity,
2
t lines (c).
Fuse Systems
Introduction
Virtual time t
The virtual time is the time span calculated when an I2t value is
divided by the square of the prospective current:
The time/current characteristic curve specifies the prospective
current I
Prospective short-circuit current I
The prospective short-circuit current is the rms value of the
line-frequency AC component, or the value of direct current to
be expected in the event of a short-circuit occurring downstream
of the fuse, were the fuse to be replaced by a component of
negligible impedance.
Let-through current characteristic curves
The let-through current characteristic curve specifies the value
of the let-through current at 50 Hz as a function of the prospective current.
The let-through current I
of the current reached during a switching operation of a fuse.
The fuse element of the fuse links melts so quickly at very high
currents that the surge short-circuit current I
occurring. The highest instantaneous value of the current
reached during the breaking cycle is called the let-through
current I
diagrams, otherwise known as let-through current diagrams.
v
and the virtual melting time tvs.
p
p
is the maximum instantaneous value
c
is prevented from
p
. The current limits are specified in the current limiting
c
1
10
1234
10101010
General representation of the time/current characteristic curve of a fuse
link of operational class gL/gG
I
: Smallest melting current
min
a: Melting time/current characteristic
b: Breaking time characteristic curve
2
c: I
t line
min
b
c
I201_06996a
[A]
The curve of the characteristic depends on the outward heat
transfer from the fuse element. DIN VDE 0636 specifies tolerance-dependent time/current ranges within which the characteristic curves of the fuse must lie. Deviations of ± 10 % are permissible in the direction of the current axis. With Siemens LV HRC
fuse links of operational class gG, the deviations work out at
less than ± 5 %, a mark of our outstanding production accuracy.
For currents up to approx. 20 I
teristic curves are the same as the breaking time characteristic
curves. In the case of higher short-circuit currents, the two
characteristic curves move apart, influenced by the respective
arc quenching time.
The difference between both lines (= arc quenching time) also
, the melting time/current charac-
n
depends on the power factor, the operational voltage and the
breaking current.
The Siemens characteristic curves show the mean virtual melting time characteristic curves recorded at an ambient temperature of (20 ± 5) °C. They do not apply to preloaded fuse links.
Oscillograph of a short-circuit current breaking operation through
a fuse link
As well as a fail-safe rated breaking capacity, the current-limiting
effect of a fuse link is of key importance for the cost effectiveness
of a system. In the event of short-circuit breaking by a fuse, the
short-circuit current continues to flow through the network until
the fuse link is switched off. However, the short-circuit current
is only limited by the system impedance.
The simultaneous melting of all the bottlenecks of a fuse element
produce a sequence of tiny partial arcs that ensure a fast breaking operation with strong current limiting. The current limitation is
also strongly influenced by the production quality of the fuse –
which in the case of Siemens fuses is extremely high. For example, an LV HRC fuse link, size 2 (224 A) limits a short-circuit current with a possible rms value of approximately 50 kA to a letthrough current with a peak value of approx. 18 kA. This strong
current limitation provides constant protection for the system
against excessive loads.
c
100 A
50 A
10 A
6 A
Rated power dissipation
Rated power dissipation is the power loss during the load of
a fuse link with its rated current under prescribed conditions.
The cost effectiveness of a fuse depends largely on the rated
power dissipation (power loss). This should be as low as possible and have low self-heating. However, when assessing the
power loss of a fuse, it must also be taken into account that there
is a physical dependence between the rated breaking capacity
and the rated power dissipation. On the one hand, fuse elements
need to be very thick in order to achieve the lowest possible
resistance value, on the other, a high rated breaking capacity
requires the thinnest possible fuse elements in order to achieve
reliable arc quenching.
Siemens fuses have the lowest possible rated power dissipation while also providing the highest possible load breaking
reliability.
These values lie far below the limit values specified in the r
egulations. This means a low temperature rise, reliable breaking
capacity and high cost effectiveness.
2
I
t value
2
t value (joule integral) is the integral of the current squared
The I
over a specific time interval:
I201_06998a
eff
Current limiting diagram
Let-through current diagram of LV HRC fuse links, size 00
Operational class gL/gG
Rated currents 6 A, 10 A, 50 A, 100 A
Legend
= Virtual melting time
t
vs
I
= Max. let-through current
c
=rms value of the prospective short-circuit current
I
rms
2
I
ts= Melting I2t value
2
I
ta=Breaking I2t value
= Rated current
I
n
P
= Rated power dissipation
v
= Temperature rise
k
= Correction factor for I2t value
A
= Recovery voltage
U
w
Û
= Peak arc voltage
s
I
= Peak short-circuit current
p
$ = Peak short-circuit current with largest DC component
% = Peak short-circuit current without DC component
U =Voltage
i =Current
t
= Melting time
s
= Arc quenching time
t
L
Specifies the I
the breaking cycle ((I
2
I
t value). The melting I2t value, also known as the total I2t value
or breaking I
2
t values for the melting process (I2ts) and for
2
tA, , – sum of melting and quenching
2
t value, is particularly important when dimension-
ing SITOR semiconductor fuses. This value depends on the
voltage and is specified with the rated voltage.
Peak arc voltage Û
s
The peak arc voltage is the maximum value of the voltage
that occurs at the connections of the fuse link during the arc
quenching time.
Residual value factor RV
The residual value factor is a reduction factor for determining the
permissible load period of the fuse link with currents that exceed
the permissible load current I
is applied when dimensioning SITOR semiconductor fuses.
’ (see rated current In). This factor
n
Varying load factor VL
The varying load factor is a reduction factor for the rated current
with varying load states. This factor is applied when dimensioning SITOR semiconductor fuses.
Recovery voltage U
w
The recovery voltage (rms value) is the voltage that occurs at the
connections of a fuse link after the power is cut off.
6
Siemens · 10/2015
■
More information
Load capability with increased ambient temperature
The time/current characteristic curve of the NEOZED/DIAZED
and LV HRC fuse links is based on an ambient temperature of
20 °C ± 5 °C in accordance with DIN VDE 0636. When used in
higher ambient temperatures (see diagram) a reduced load-car-
rying capacity must be planned for. At an ambient temperature
of 50 °C, for example, an LV HRC fuse link should be dimensioned for only 90 % of the rated current. While the short-circuit
behavior is not influenced by an increased ambient temperature,
it is influenced by overload and operation at rated value.
120
100
90
80
60
40
Current carrying capacity [%]
20
0
Influence of the ambient temperature on the load capability of
NEOZED/DIAZED and LV HRC fuses of operational class gG with
natural convection in the distribution board.
When gG fuses are assigned for cable and line protection
against overloading, the following conditions must be met in
order to comply with DIN VDE 0100 Part 430:
(1) I
= In = Iz (rated current rule)
B
= 1.45 × Iz (tripping rule)
(2) I
2
: Operational current of electrical circuit
I
B
: Rated current of selected protective device
I
n
: Permissible current carrying capacity of the cable or line
I
z
under specified operating conditions
I
: Tripping current of the protective device under specified
2
operating conditions ("high test current").
These days, the factor 1.45 has become an internationally
accepted compromise of the protection and utilization ratio of a
line, taking into account the breaking response of the protective
device (e.g. fuse).
In compliance with the supplementary requirements for
DIN VDE 0636, Siemens fuse links of operational class gG
comply with the following condition:
"Load breaking switching with I
test duration under special test conditions in accordance with
the aforementioned supplementary requirements of
DIN VDE 0636".
This therefore permits direct assignment.
Fuse Systems
Introduction
=1.45 × In during conventional
2
Siemens · 10/2015
7
Fuse Systems
NEOZED Fuse Systems
NEOZED fuse links
■
Overview
The NEOZED fuse system is primarily used in distribution technology and industrial switchgear assemblies. The system is easy
to use and is also approved for domestic installation.
The MINIZED switch disconnectors are primarily used in switchgear assemblies and control engineering. They are approved for
switching loads as well as for safe switching in the event of short
circuits. The MINIZED D02 is also suitable for use upstream of
the meter in household applications in compliance with the
recommendations of VDEW according to TAB 2007.
Due to its compact design, the MINIZED D01 fuse switch
disconnector is primarily used in control engineering.
The NEOZED fuse bases are the most cost-effective solution for
using NEOZED fuses. All NEOZED bases must be fed from the
bottom to ensure that the threaded ring is insulated during removal of the fuse link. The terminals of the NEOZED bases are
available in different versions and designs to support the various
installation methods.
• On top of one another, with vertical standard
mounting rail
Degree of protection acc. to IEC 60529
Terminals
With touch protection acc. to BGV A3
Ambient temperature°C
Terminal versions
Conductor cross-sections
• Solid and strandedmm
• Flexible, with end sleevemm
• Finely stranded, with end sleevemm
Tightening torqueNm
1)
Degree of protection IP20 is tested according to regulations using a
straight test finger (from the front), with the device mounted and equipped
with a cover, housing or some other enclosure.
The DIAZED fuse system is one of the oldest fuse systems in
the world. It was developed by Siemens as far back as 1906.
It is still the standard fuse system in many countries to this day.
It is particularly widely used in the harsh environments of industrial applications.
The series is available with rated voltages from 500 V to 750 V.
All DIAZED bases must be fed from the bottom to ensure an
insulated threaded ring when the fuse link is being removed.
Reliable contact of the fuse links is only ensured when used
together with DIAZED screw adapters.
The terminals of the DIAZED bases are available in different versions and designs to support the various installation methods.
The high-performing EZR bus-mounting system for screw fixing
is an outstanding feature. The busbars, which are particularly
suited for bus-mounting bases, have a load capacity of up to
150 A with lateral infeed.
DIAZED cap for fuse bases
DIAZED collar for fuse bases
DIAZED fuse bases
DIAZED cover for fuse bases
DIAZED screw adapter
DIAZED fuse link
DIAZED screw cap
DIAZED fuse base (with touch protection BGV A3)
3
4
9
10
i201_18300
8
DIII fuse bases with terminal version BS
• Outgoing feeders (top), saddle terminal S
• Incoming feeders (bottom), clamp-type terminal B
DIII fuse bases with terminal version BB
• Outgoing feeders (top), clamp-type terminal B
• Incoming feeders (bottom), clamp-type terminal B
CharacteristicAcc. to DIN VDE 0635
Rated voltage U
Rated current I
Rated breaking capacitykA AC
Overvoltage category
Mounting position
Non-interchangeability
Degree of protection Acc. to IEC 60529
Resistance to climate°CUp to 45, at 95 % rel. humidity
Ambient temperature°C
1)
Degree of protection IP20 is tested according to regulations using a
straight test finger (from the front), with the device mounted and equipped
with a cover, housing or some other enclosure.
n
n
DIN VDE 0636
V AC500, 690, 750
V DC
A2...100
kA DC
IEC 60269-3; DIN VDE 0635; DIN VDE 0636-3; CEE 16
gG
Slow and quick
500, 600, 750
50, 40 at E16
8, 1.6 at E16
III
II (DIAZED fuse bases made of molded plastic for use at 690 V AC / 600 V DC)
Size: DIII
Operational class: Quick (railway network protection)
Rated voltage:750 V AC/750 V DC
Rated current: 2 ... 63 A
Time/current characteristics diagram
Fuse Systems
DIAZED fuse systems
Melting I2t values diagram
Typ eI
Current limiting diagram
Peak short-circuit current with largest DC component
$
% Peak short-circuit current without DC component
5SD601
5SD602
5SD603
5SD604
5SD605
5SD606
5SD607
5SD608
5SD610
5SD611
n
AWA2sA2s
22.80.72
444.513
64.81029
104.850135
165.978220
206.3125380
258.3265800
35135501600
5016.518005 500
631831009 600
P
v
I2t
s
I2t
a
4ms500 V AC
Siemens · 10/2015
23
Fuse Systems
Cylindrical Fuse Systems
Cylindrical fuse links and cylindrical fuse holders
■
Overview
Cylindrical fuses are standard in Europe. There are a range of
different cylindrical fuse links and holders that comply with the
standards IEC 60269-1, -2 and -3, and which are suitable for use
in industrial applications. In South West Europe they are also
approved for use in residential buildings.
The cylindrical fuse holders are also approved according to
UL 512. The cylindrical fuse holders are tested and approved as
fuse disconnectors according to the switching device standard
IEC 60947-3. They are not suitable for switching loads.
Cylindrical fuse holders can be supplied with or without signal
detectors. In the case of devices with signal detector, a small
electronic device with LED is located behind an inspection
window in the plug-in module. If the inserted fuse link is tripped,
this is indicated by the LED flashing.
The switching state of the fuse holder can be signaled over a
laterally retrofitted auxiliary switch, which enables the integration
of the fuses in the automation process.
■
Technical specifications
Sizemm × mm
Standards
Operational class
Rated voltages U
Rated current I
Rated breaking capacity
• 500 V versionskA AC
• 400 V versionskA AC
Mounting position
n
n
VAC400400 or 500
A 2...200.5 ... 324...508...1000.5 ... 322...5010 ... 100
• Devices with pole number 1P+N are available in a single
modular width. This reduces the footprint by 50 %
• The sliding catch for type ranges 8 x 32 mm and 10 x 38 mm
enables the removal of individual devices from the assembly
• Space for a spare fuse in the plug-in module enables the
fast replacement of fuses. This saves time and money and
increases system availability
• A flashing LED signals that a fuse link has been tripped.
This enables fast detection during runtime
Cylindrical fuse links
3NW63..3NW60..3NW61..3NW62..3NW80..3NW81..3NW82..
8×3210 × 3814 × 5122 × 5810 × 3814 × 5122 × 58
IEC 60269-1, -2, -3; NF C 60-200; NF C 63-210, -211; NBN C 63269-2, CEI 32-4, -12
gGaM
--120100
20120120
Any, preferably vertical
20
120100
20
Cylindrical fuse holders
3NW73..3NW70..3NW71..3NW72..
Sizemm × mm
Standards
ApprovalsAcc. to UL
Rated voltage U
Rated current I
Rated breaking capacitykA
Breaking capacity
• Utilization categoryAC-20B (switching without load), DC-20B
No-voltage changing
of fuse links
Sealable
when installed
Mounting position
Degree of protection Acc. to IEC 60529
Terminals with touch protection
according to BGV A3 at incoming
and outgoing feeder
Ambient temperature°C-5 to +40, humidity 90 % at +20
Conductor cross-sections
• Rigidmm
•Strandedmm
• Finely stranded, with end sleevemm
• AWG (American Wire Gauge)AWG
Tightening torqueNm
1)
Degree of protection IP20 is tested according to regulations using a
straight test finger (from the front), with the device mounted and equipped
with a cover, housing or some other enclosure.
2)
Max. cross-section 10 mm2 with K28 crimper from Klauke.
n
n
Acc. to CSA
Acc. to UL/CSAV AC
VAC400690
AAC 203250100
2
2
2
8×3210 × 3814 × 5122 × 58
IEC 60269-1, -2, -3; NF C 60-200, NF C 63-210, -211; NBN C 63269-2-1; CEI 32-4, -12;
UL 4248-1