Fuses Contents
Fuse Information 30
Fuse Cross Reference Table 32
British Standard Fuses 34
Miniature Fuses 46
Cartridge Fuses 56
American Standard Fuses 76
NH Blade Fuses 86
European Semiconductor Fuses 94
Bottle Fuses 104
Automotive Fuses 108
Medium Voltage Fuses 112
P: 1300 387 326
F: (03) 9555 3944
W: www.fuseco.com.au
Fuse Information
Is choosing the right fuse important?
Does it really matter what fuse I use?
Is the voltage rating important?
Yes, very important! The voltage rating of the selected fuse must be greater
than or equal to the circuit voltage. Since fuses have such low resistance, the
voltage rating becomes critical only when the fuse is trying to open. The fuse
must be able to open quickly, extinguish the arc after the fuse element has
melted and prevent the system open circuit voltage from re-striking across
the open fuse element.
Choosing the right fuse for your application is vital. A fuse is a protective
device so if it’s not selected with care, the level of protection that your
circuit will experience may be compromised. When your machine/circuit
was designed, the designer carefully considered the level of protection
that was required, so getting it wrong may have serious consequences.
Also, please refer to ‘What is a Utilisation Category?’ in this section.
Can I use an AC rated fuse in a DC application?
What are fuses used for?
Fuses serve two main purposes:
1. T o protect components and equipment from costly damage caused
by overcurrents.
2. To isolate sub-systems from the main system once a fault has occurred.
Also, please refer to ‘Can I replace a fuse with a circuit breaker?’
in this section.
What are Overcurrents?
Overcurrents exist when the normal load for a circuit is exceeded and
they can be either (1) overloads, or (2) short circuits. An overload is any
current flowing within the normal circuit path that is higher than the
circuit normal full load current. A short circuit is an overcurrent which
greatly exceeds the normal full load current of the circuit. Also, as the
name infers, a short circuit leaves the normal current carrying path of the
circuit and takes a “short cut” around the load and back to the power
source. Short circuits are also referred to as ‘fault currents’. Components
and equipment can be seriously damaged by both types of overcurrents.
However if they are not immediately cut-off or limited, short circuits can
have catastrophic consequences.
Direct currents are very difficult to stop or interrupt when compared to
alternating currents. Alternating current sources reverse the flow of current
many times a second (in some locations 100 times a second on 50 Hz
systems). Each time the current reverses, it goes to zero in magnitude.
A zero current is very easy for a melting fuse to stop or interrupt—it is
already stopped, and there is no force trying to sustain an arc across the
fuse element.
DC currents, as the name implies, are currents that travel in one direction
only. They do not reverse. Fuses bear the entire burden (with no help from
the current) of acting to stop these currents. The internal elements of a fuse
must react to an over-current condition (usually by melting) and as they
react, they must do so with enough capability to interrupt the current from
flowing while extinguishing any arc that might form. DC fuses are relatively
sophisticated devices that have many different internal elements that must
work together.
There are fuses with equal AC and DC voltage ratings but in most cases,
the DC voltage rating is significantly less than the AC voltage rating. If a
fuse only has an AC voltage rating, it most probably was not designed for
DC applications and hence has never been tested within a DC environment.
If you would like to ask if a specific AC rated fuse can be used in a DC
environment, please call Fuseco.
How do I identify & replace a blown fuse?
Is the current rating important?
In most cases, people contact Fuseco when they need to replace an
existing fuse that has blown. In such cases, it is paramount that either the
identical fuse or an exact equivalent is provided. Care must be taken to
make sure that the fuse provided is of the same utilisation category and
has the same electrical performance of the original. If you need assistance
with this, I welcome you to contact us and we would be very happy to
assist you. Also, we provide many types of cross-reference charts in this
catalogue, on our website or in a wall chart format. These tools can help
you identify equivalent fuse types.
Yes, very important! Each fuse is marked with a nominal current rating.
The current rating of the fuse must be higher than the circuit’s normal
operating current. As to how much greater, it depends on a number of
factors, including what type of opening characteristic you desire.
Contact Fuseco for more specific advice.
How do I select a fuse for a new application?
During normal conditions, the fuse must carry the load current of the
circuit without blowing and opening the circuit. However, when an
overcurrent occurs, the fuse must interrupt the overcurrent and
withstand the voltage across the fuse after arcing. It is important that
designers take account of temporary conditions such as surges & spikes
during fuse selection. To properly select a fuse the following items must
be considered:
• Available short circuit current
• Full load current
• Characteristics of components to be protected
• Any in-rush characteristics of the circuit (eg. Motor start-up)
• The available space
• The ambient conditions
• Any standards requirements
• Suitability to the proposed fuse holder (eg. Power loss)
P: 1300 387 326
HRC means high rupturing capacity. Also known as high breaking capacity
(HBC) or interrupting capacity. Usually ceramic and measured in kA.
Is the breaking capacity important?
Yes, very important! A fuse must be able to open the circuit during a short
circuit without losing physical integrity. In other words, it should be able
to exist under a maximum fault level load without physically cracking or
disintegrating. The breaking capacity of a fuse is the maximum available
current, at the rated voltage that the device can safely open without
physically rupturing. The breaking capacity of the fuse must be greater than
the potential fault (short circuit) current of the circuit.
The Breaking Capacity is also known as the ‘Interrupting Rating’. It is
expressed in amps (A) but breaking capacity values are often large numbers.
For example, a breaking capacity of 120,000A is usually expressed as 120kA.
• Voltage rating (AC or DC)
30
What does HRC mean?
F: (03) 9555 3944
Should I care about standards and approvals?
Yes, it’s an important consideration. The IEC standards are followed by
many European and Asian countries while the UL standards are followed by
North America. Both of these standards have different ways of defining and
measuring their criteria so UL and IEC rated fuses are not interchangeable. If
you are replacing fuses, it is a good idea to replace with a fuse that complies
to the same standard as the original fuse. If you are sourcing fuses to be
used in exported equipment, make sure that the fuses comply with the
destination country’s required standards.
W: www.fuseco.com.au
Prices do not include GST
Fuse Information
What is a Utilisation Category?
All fuses are designed to open a circuit to protect other valuable components
from overcurrents. However, they are not all designed to do it in the same
way! There are many different types of fuse performance options and
selecting the correct performance for your application is vital. For this
purpose, the IEC created ‘Utilisation Categories’ (please refer to the inside
cover of the Fuse separator in this catalogue).
For example, fuses that are designed to protect sensitive semiconductor
devices are designed to open very quickly and let through a minimum
amount of energy during an overcurrent yet motor protection fuses are
designed to withstand large in-rush currents in multiple start-up situations.
Some fuses only protect against short circuits when others also protect
against overloads. There are many differences. Choosing the wrong fuse
could potentially cause serious damage by under-protecting or could cause
excessive down time due to nuisance-blowing. Fuseco can assist you to
make the right choice.
What are the main fuse groups?
There are literally millions of different fuses that exist around the world,
however most of them belong to one of the following groups:
1. Sub-miniature and SMD fuses
Can I enclose a semiconductor fuse
in a fuse holder?
Semiconductor fuses run hotter than most fuses. In order to achieve a very
accurate melting temperature, these fuses have been engineered with a high
proportion of pure silver in their element and their body filling is high quality
silica, which helps to draw heat away from the fuse element. Due to this
fact, it is generally accepted that they should not be enclosed so as to ensure
sufficient cooling of the fuses so they can operate as specified. Fuse cooling
is very challenging if the fuse holder doesn’t allow sufficient airflow around
the fuse.
The ‘power loss’ value of a fuse is a measure of the heat emanating from the
fuse under full load. It is used to determine how quickly the fuse dissipates
its heat. This is also known as the ‘heat loss’, ‘watts loss’ or ‘heat dissipation
value’. Power loss is measured in Watts.
If any fuse is to be used in a fully enclosed holder, then the power loss
rating of the fuse holder used must be greater than that of the fuse to
ensure that there is sufficient dissipation of the heat around the fuse. In
other words, the fuse holder’s ability to tolerate heat must be higher than
the heat the fuse produces. If this is not followed, the fuse holder may warp,
melt or explode. Due to the fact that semiconductor fuses run much hotter
than type gG or type aM fuses, extra care must be taken when choosing
fuse holders for them.
2. Miniature fuses
3. Cartridge fuses
4. British Standard fuses
5. DIN NH Blade fuses
6. Automotive & DC fuses
7. European Standard & Bottle Fuses
Can I replace a semiconductor fuse with a
standard gG fuse?
8. American Standard fuses
Please don’t! If you do, then in the event of an overcurrent, you run the risk
of experiencing critical damage to the semiconductor devices in the circuit.
In plain words, your expensive components will blow before your fuse does.
9. Medium Voltage fuses
What is the I²t of a fuse?
The I²t value of a fuse is a measure of the energy which is required to open
the fuse element and to interrupt the current. It is determined by factors
such as the design of the fuse element, the type of filler, etc.
The I²t value is also a direct measure for the let-through energy which is
exposed to the item being protected by the fuse in case of an overcurrent
situation. It is a function of current squared and time, hence it is expressed in
A²s (amps x amps x seconds).
What is a semiconductor fuse?
Semiconductor fuses are fuses that have been specifically designed to protect
semiconductor devices. They are often also referred to as solid state fuses,
rectifier fuses or ultra-rapid fuses. Semiconductor devices are extremely
sensitive to current fluctuations and require special protection. To perform
this function, semiconductor fuses are able to open the circuit (blow)
significantly quicker than other fuse types, and it is extremely important that
they are replaced by direct equivalents when required. Semiconductor fuses
belong to the utilisation categories aR, gR and gS.
How do I choose the right semiconductor fuse?
Semiconductor fuses are not selected like other fuse types. The main
selection criteria for a semiconductor fuse is its I2t value…. even more
important than its current rating! This is because semiconductor devices are
extremely sensitive to current fluctuations and the maximum amount of letthrough energy that they are exposed to during an overcurrent needs to be
accurately controlled. This is super-important when selecting fuse protection
for semiconductor devices.
If you are replacing an existing fuse, make sure that the new selected fuse
has an I2t value that within ±10% of the original fuse’s I2t value. In this case,
I2t values need to be compared at the same system voltage.
Prices do not include GST
If you are selecting a semiconductor fuse for a new application, the I2t value
of the selected fuse must be lower (or quicker) than the lowest I2t value of
any of the components being protected. This ensures that the fuse opens
before allowing any damaging let-through current to reach the components.
In addition, refer to the question ‘Can I enclose a semiconductor fuse in a
fuse holder?’ in this section.
P: 1300 387 326
Can I replace a fuse with a circuit breaker?
Circuit breakers have the advantage of being resettable and operationally
cheaper and they have certainly taken over the downstream protective
role where the potential fault currents are lower. So if you have a fuse in
a downstream role, then in some cases, YES you can replace it with
a circuit breaker.
However, due to their unique qualities, fuses are still required upstream in
the critical role. They are, in essence, the ‘gatekeepers’ of the protection
system. They are actually the most important protective device in the system.
Fuses have three unique characteristics:
1. They are safe. Modern fuses have extremely high breaking capacities –
can withstand very high fault currents without rupturing.
2. Properly applied, fuses prevent ‘blackouts’. Only the fuse nearest the fault
opens without upstream fuses (feeders or mains) being affected. Fuses can
provide selective co-ordination.
3. Fuses provide optimum component protection by keeping fault currents to
a low value… They are said to be current limiting.
So if you have a fuse in a critical upstream role. Then NO you cannot replace
it with a circuit breaker.
We welcome you to contact the team at Fuseco to assist you with any
questions or projects. Also, please explore our website www.fuseco.
com.au as you will find plenty of useful information, tools and crossreference charts.
F: (03) 9555 3944
W: www.fuseco.com.au
31
Fuse Cross Reference Table
Competitor
Fuseco
Page
TCP
TC
LC
4200..
MD
36
37
58
59
70
TF
NIT
NS
MP205DA
M205
DA205
MP205
41NM
4220..
AUTO
MINI
MAXI
37, 39
35
34
46
46
46
46
49
72
108
108
108
MF
3AG
3AGDA
3AB
TKF
3ABDA
TIA
NH1F
NH2F
NH00F/NH000F
NH3F
75
47
47
47
37
47
35
86
87
86
87
TMF
TM
37
38
TTM
1000504
1000704
1000904
1000507
1000707
1000907
1002804
38
104
105
105
104
105
105
106
TIS
35
189020
189140
53
53
TLM
PL
38
52
1
2
200B_C
20B
20C
215
217
218
219
225
22G
257
297
299
3
3057F
312
313
314
315B_C
326
32B
3NA21
3NA22
3NA28
3NA33
4
400B_C
404B_C
5
504B_C
5SB2
5SB4
5SC4
5SD2
5SD4
5SD5
5SE2
6
63B
7
7006563
7006565
8
32
Fuseco
Page
L25S
L50S
L60S
L70S
JLLN
JLS
JLLS
JTD
TIS
3AB
TBC
CCK
CCL
SLC
3AG
7AG
8AG
CNL
CNN
AUTO
CCMR
KLKD
KLKR
FLQ
KLDR
81
82
83
83
79
78
79
78
35
47
37
111
111
63
47
52
52
110
110
108
62
61
61
61
62
BLF
BLN
TIS
BLS
TB
5007606
5005306
5005406
5007306
5007706
5007406
5007106
2055920
5007506
60
60
35
58
36
40
41
41
41
40
41
42
42
42
4205..
4200..
4210..
4220..
41NM
CCK
CCL
TC
TCP
480032
480332
485201
485205
485301
485305
485301
5007706
56
59
67
72
49
111
111
37
36
65
65
69
69
73
73
73
40
A
100B
100B_C
1026F
10G
1329F
804B_C
8AB
Competitor
P: 1300 387 326
A25X
A50P
A60X
A70P
A3T
A4J
A6T
AJT
AAO
ABC
AC
ACK
ACL
AG
AGC
AGW
AGX
ANL
ANN
ATC
ATDR
ATM
ATMR
ATQ
ATQR
C
C08G
C10G
C14G
C22G
C520
ACK
ACL
CD
CEO
CH101
CH103
CH141
CH143
CH221
CH223
CMS221
CT
F: (03) 9555 3944
Fuseco
Page
1000201
1000504
1000704
TF
TFP
NH00-3DS
NH1-3DS
NH2-3DS
NH3-3DS
FLU
104
104
105
37
36
93
93
93
93
64
TKF
TMF
2055920
TKM
TM
MES
5007306
37
37
42
37
38
34
41
NS
NIT
TTM
TT
RS20H
RS32BW
RS32H
RS63H
480032
480332
485201
FLM
FLQ
KLDR
FLNR
FLSR
FLU
L50S
A100P
L70S
L25S
34
35
38
38
39
39
39
39
65
65
69
60
61
62
66, 77
77
64
67, 82
85
68, 83
81
D
B
BAF
BAN
BAO
BBS
BC
BSUR1
BSUR2
BSUR3
BSUR4
BSUR5
BSUR6
BSUR7
BSUR8
BSUR9
Competitor
W: www.fuseco.com.au
D16
D27
D33
DD
DEO
DIND003S
DIND013S
DIND023S
DIND033S
DMM
E
ED
ED
EET
EFS
EF
ES
ET
F
F06
F21
FF
FG
FM20H
FM32BW
FM32H
FM63H
FMC101
FMC103
FMC141
FNM
FNQ
FNQ-R
FRN-R
FRS-R
FSM
FWH
FWJ
FWP
FWX
Prices do not include GST
Fuse Cross Reference Table
Competitor
Fuseco
Page
MP205
M205
DA205
TLM
TLT
5005406
5005306
5007106
5007606
5007406
5007306
5007506
5007706
5007306
5007406
5007506
5007506
2055920
5007306
5007406
5007506
5007406
5007506
5007506
2055920
5007306
2055920
46
46
46
38
38
41
41
42
40
41
41
42
40
41
41
42
42
42
41
41
42
41
42
42
42
41
42
TIA
SFH22BW
SFH22FW
SFH30BW
SFH30FW
35
71
71
75
75
JLLN
JLLS
JLS
79
79
78
TIS
TB
TBC
L25S
2258F
35
36
37
81
71
G
GDA
GDB
GDC
GF
GG
GSA 125-250A
GSA 25-100A
GSA 300-600A
GSA 5-20A
GSB 100-250A
GSB 25-80A
GSB 300-500A
GSB 5-20A
GSG1000 16-55A
GSG1000 170, 190A
GSG1000 175A
GSG1000 200-500A
GSG1000 75-160A
GSGB 16-63A
GSGB 170, 190A
GSGB 175, 200A
GSGB 225, 250A
GSGB 300-800A
GSGB 235A
GSGB 75A
GSGB 80A
GSGB 85-160A
J
JJN
JJS
JKS
K
K07
K08
K09
KAB
KR85
L
L09
L14
LA30QS
LA50QS
LA70QS
LCT
LD
LET
LK
LK
LKC
LKC
LMMT
LMT
LP-CC
LPJ-SP
LR85
Fuseco
Page
TF
TFP
MAXI
3ABDA
3AGDA
2258F
ESD/MES
5007506
5007406
37
36
108
47
47
71
34
42
41
N09
N100B
N100B_C
N11
N200B
N200B_C
N20B
N20C
N315B_C
N315BS_C
N32B
N400B_C
N404B_C
N40TB_C
N504B_C
N630B_C
N63B_C
N63B_C
N804B_C
N805B_C
NHC00G
NHG00
NHG1
NHG2
NHG3
NITD
NON
NOS
NSD
NVK
NYK
NZ01
NZ02
TKF
TCP
TC
TKM
TFP
TF
NIT
NS
TKF
TKM
TIA
TMF
TM
TB
TTM
TT
TIS
TBC
TLM
TLT
NH00F
NH00F
NH1F
NH2F
NH3F
NIT
NLN
NLS
NS
2258F
3057F
1002804
1002804
37
36
37
37
36
37
35
34
37
37
35
37
38
36
38
38
35
37
38
38
86
86
86
87
87
35
66, 76
76
34
71
75
106
106
OT
OTM
OTS
NLN
BLF/BLN
NLS
66, 76
60
76
TMF
TM
1451F
37
38
67
TTM
TT
2258F
2258F
3057F
38
38
71
71
75
M
H
H07
HSH22B/W
HSH22F/W
HSH30B/W
HSH30F/W
Competitor
TC
TCP
A30QS
A50QS
A70QS
5007606
MD
5005306
LC
1735F
LC
MD
5007106
5005406
CCMR
JTD
3057F
Prices do not include GST
37
36
81
82
84
40
70
41
58
70
58
70
42
41
62
78
75
M09
M14
MAX
MDA
MDL
ME
MES
MMT
MT
Competitor
Fuseco
Page
TLM
TLT
M205
MP205
DA205
MP205DA
DA205
SFH22BW
SFH22FW
SFH30BW
SFH30FW
NIT
TIA
TIS
BLS
SLC
TCP
TFP
TB
TBC
TC
TF
TKF
TMF
TKM
TLM
TM
TTM
MD
NS
MES
SS
LST
TLT
TT
38
38
46
46
46
46
46
71
71
75
79
35
35
35
58
63
36
36
36
37
37
37
37
37
37
38
38
38
70
34
34
34
35
38
38
PL
FLNR
FLM
FLSR
52
66, 77
60
77
1751F
70
S
N
S11
S12
S500
S501
S504
S505
S506
S71002ABWS
S71002AFWS
S71002BBW
S71002BFW
SA2
SB3
SB4
SBS
SC
SD5
SD6
SE4
SF3/SF4
SF5
SF6
SF7
SF8
SG7
SH10
SH8
SH9
SK
SN2
SP
SSD
STD
SY10
SY9
T
TDC180
TR-R
TRM
TRS-R
U
UK
P
P09
P11
PK
R
R11
R12
RHB
RHF
RHLF
P: 1300 387 326
F: (03) 9555 3944
W: www.fuseco.com.au
33