Bussmann Fuse Technology

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Circuit Protection

Electrical distribution systems are often quite complicated. They

cannot be absolutely fail-safe. Circuits are subject to destructive

overcurrents. Harsh environments, general deterioration, acci-

dental damage, damage from natural causes, excessive expan-

sion, and/or overloading of the electrical distribution system are

factors which contribute to the occurrence of such overcurrents.

Reliable protective devices prevent or minimize costly damage to

transformers, conductors, motors, and the other many compo-

nents and loads that make up the complete distribution system.

Reliable circuit protection is essential to avoid the severe mone-

tary losses which can result from power blackouts and prolonged

downtime of facilities. It is the need for reliable protection, safety,

and freedom from fire hazards that has made the fuse a widely

used protective device.

Overcurrents

An overcurrent is either an overload current or a short-circuit cur-rent. The overload current is an excessive current relative to nor-

mal operating current, but one which is confined to the normal

conductive paths provided by the conductors and other compo-

nents and loads of the distribution system. As the name implies,

a short-circuit current is one which flows outside the normal con-

ducting paths.

Overloads

Overloads are most often between one and six times the normal

current level. Usually, they are caused by harmless temporary

surge currents that occur when motors are started-up or trans-

formers are energized. Such overload currents, or transients, are

normal occurrences. Since they are of brief duration, any tem-perature rise is trivial and has no harmful effect on the circuit

components. (It is important that protective devices do not react

to them.)

Continuous overloads can result from defective motors (such as

worn motor bearings), overloaded equipment, or too many loads

on one circuit. Such sustained overloads are destructive and

must be cut off by protective devices before they damage the

distribution system or system loads. However, since they are of

relatively low magnitude compared to short-circuit currents,

removal of the overload current within minutes will generally pre-

vent equipment damage. A sustained overload current results in

overheating of conductors and other components and will cause

deterioration of insulation, which may eventually result in severedamage and short-circuits if not interrupted.

Short-Circuits

Whereas overload currents occur at rather modest levels, the

short-circuit or fault current can be many hundred times larger

than the normal operating current. A high level fault may be

50,000 amperes (or larger). If not cut off within a matter of a few

thousandths of a second, damage and destruction can become

rampant—there can be severe insulation damage, melting of

conductors, vaporization of metal, ionization of gases, arcing,

and fires. Simultaneously, high level short-circuit currents can

develop huge magnetic-field stresses. The magnetic forces

between bus bars and other conductors can be many hundreds

of pounds per linear foot; even heavy bracing may not be ade-

quate to keep them from being warped or distorted beyond

repair.

Fuses

The fuse is a reliable overcurrent protective device. A “fusible” link

or links encapsulated in a tube and connected to contact termi-

nals comprise the fundamental elements of the basic fuse.

Electrical resistance of the link is so low that it simply acts as a

conductor. However, when destructive currents occur, the link

very quickly melts and opens the circuit to protect conductors

and other circuit components and loads. Fuse characteristics are

stable. Fuses do not require periodic maintenance or testing.Fuses have three unique performance characteristics:

1. Modern fuses have an extremely “high interrupting

rating”—can withstand very high fault currents without

rupturing.

2. Properly applied, fuses prevent “blackouts.” Only the

fuse nearest a fault opens without upstream fuses

(feeders or mains) being affected—fuses thus provide

“selective coordination.” (These terms are precisely

defined in subsequent pages.)

3. Fuses provide optimum component protection by

keeping fault currents to a low value…They are said to

be “current limiting.”

Voltage Rating

The voltage rating of a fuse must be at least equal to or greater

than the circuit voltage. It can be higher but never lower. For

instance, a 600 volt fuse can be used in a 208 volt circuit.

The voltage rating of a fuse is a function of its capability to

open a circuit under an overcurrent condition. Specifically,

the voltage rating determines the ability of the fuse to suppress

the internal arcing that occurs after a fuse link melts and an arc

is produced. If a fuse is used with a voltage rating lower than the

circuit voltage, arc suppression will be impaired and, under some

fault current conditions, the fuse may not clear the overcurrent

safely. Special consideration is necessary for semiconductor fuseand medium voltage fuse applications, where a fuse of a certain

voltage rating is used on a lower voltage circuit.

Ampere Rating

Every fuse has a specific ampere rating. In selecting the ampere

rating of a fuse, consideration must be given to the type of load

and code requirements. The ampere rating of a fuse normally

should not exceed the current carrying capacity of the circuit. For

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instance, if a conductor is rated to carry 20 amperes, a 20

ampere fuse is the largest that should be used. However, there

are some specific circumstances in which the ampere rating is

permitted to be greater than the current carrying capacity of the

circuit. A typical example is the motor circuit; dual-element fuses

generally are permitted to be sized up to 175% and non-time-

delay fuses up to 300% of the motor full-load amperes. As a rule,

the ampere rating of a fuse and switch combination should be

selected at 125% of the continuous load current (this usually

corresponds to the circuit capacity, which is also selected at

125% of the load current). There are exceptions, such as when

the fuse-switch combination is approved for continuous opera-

tion at 100% of its rating.

Interrupting Rating

A protective device must be able to withstand the destructive

energy of short-circuit currents. If a fault current exceeds the

capability of the protective device, the device may actually rup-ture, causing additional damage. Thus, it is important when

applying a fuse or circuit breaker to use one which can sustain

the largest potential short-circuit currents. The rating which

defines the capacity of a protective device to maintain its integ-

rity when reacting to fault currents is termed its “interrupting

rating”. The interrupting rating of most branch-circuit, molded

case, circuit breakers typically used in residential service entrance

panels is 10,000 amperes. (Please note that a molded case

circuit breaker’s interrupting capacity will typically be lower than

its interrupting rating.) Larger, more expensive circuit breakers

may have interrupting ratings of 14,000 amperes or higher. In

contrast, most modern, current-limiting fuses have an interrupt-

ing rating of 200,000 or 300,000 amperes and are commonly

used to protect the lower rated circuit breakers. The National

Electrical Code, Section 110-9, requires equipment intended to

break current at fault levels to have an interrupting rating sufficient

for the current that must be interrupted.

Selective Coordination – Prevention of Blackouts

The coordination of protective devices prevents system power

outages or blackouts caused by overcurrent conditions. When

only the protective device nearest a faulted circuit opens and

larger upstream fuses remain closed, the protective devices are

“selectively” coordinated (they discriminate). The word “selective”

is used to denote total coordination…isolation of a faulted circuit

by the opening of only the localized protective device.

This diagram shows the minimum ratios of ampere ratings of LOW-PEAK YELLOW fuses that are required to provide “selective coordination”(discrimination) of upstream and downstream fuses.

Unlike electro-mechanical inertial devices (circuit breakers), it is a

simple matter to selectively coordinate fuses of modern design.

By maintaining a minimum ratio of fuse-ampere ratings between

an upstream and downstream fuse, selective coordination is

assured.

Current Limitation – Component Protection

A non-current-limiting protective device, by permitting a short-circuit current to build up to its full value, can let an immense amount ofdestructive short-circuit heat energy through before opening the circuit.

A current-limiting fuse has such a high speed of response that it cuts off ashort-circuit long before it can build up to its full peak value.

If a protective device cuts off a short-circuit current in less than

one-quarter cycle, before it reaches its total available (and highly

destructive) value, the device is a “current-limiting” device. Most

modern fuses are current-limiting. They restrict fault currents to

such low values that a high degree of protection is given to circuit

components against even very high short-circuit currents. They

permit breakers with lower interrupting ratings to be used. They

can reduce bracing of bus structures. They minimize the need of

other components to have high short-circuit current “withstand”

ratings. If not limited, short-circuit currents can reach levels of

30,000 or 40,000 amperes or higher in the first half cycle (.008

seconds, 60 hz) after the start of a short-circuit. The heat that

can be produced in circuit components by the immense energy

of short-circuit currents can cause severe insulation damage or

even explosion. At the same time, huge magnetic forces

developed between conductors can crack insulators and distort

and destroy bracing structures. Thus, it is important that

a protective device limit fault currents before they reach their

full potential level.

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Fuse Technology

KRP-C1200SP

2:1 (or more)

LPS-RK 600SP

LPS-RK 200SP

2:1 (or more)

Normalload current

Initiation ofshort-circuitcurrent

Circuit breaker tripsand opens short-circuitin about 1 cycle

Areas within waveformloops represent destructiveenergy impressed uponcircuit components

Fuse opens and clearsshort-circuit in lessthan cycle



Operating Principles of Bussmann® Fuses

The principles of operation of the modern, current-limiting Buss

fuses are covered in the following paragraphs.

Non-Time-Delay Fuses The basic component of a fuse is the link. Depending upon the

ampere rating of the fuse, the single-element fuse may have one

or more links. They are electrically connected to the end blades (or

ferrules) (see Figure 1) and enclosed in a tube or cartridge sur-

rounded by an arc quenching filler material. BUSS® LIMITRON®

and T-TRON® fuses are both single-element fuses.

Under normal operation, when the fuse is operating at or near its

ampere rating, it simply functions as a conductor. However, as

illustrated in Figure 2, if an overload current occurs and persists for

more than a short interval of time, the temperature of the link even-

tually reaches a level which causes a restricted segment of the link

to melt. As a result, a gap is formed and an electric arc estab-

lished. However, as the arc causes the link metal to burn back, the

gap becomes progressively larger. Electrical resistance of the arc

eventually reaches such a high level that the arc cannot be sus-

tained and is extinguished. The fuse will have then completely cut

off all current flow in the circuit. Suppression or quenching of the

arc is accelerated by the filler material. (See Figure 3.)

Single-element fuses of present day design have a very high

speed of response to overcurrents. They provide excellent short-

circuit component protection. However, temporary, harmless

overloads or surge currents may cause nuisance openings unless

these fuses are oversized. They are best used, therefore, in cir-

cuits not subject to heavy transient surge currents and the tem-

porary over-load of circuits with inductive loads such as motors,transformers, solenoids, etc. Because single-element, fast-acting

fuses such as LIMITRON and T-TRON fuses have a high speed of

response to short-circuit currents, they are particularly suited for

the protection of circuit breakers with low interrupting ratings.

Whereas an overload current normally falls between one and

six times normal current, short-circuit currents are quite high.

The fuse may be subjected to short-circuit currents of 30,000

or 40,000 amperes or higher. Response of current limiting fuses

to such currents is extremely fast. The restricted sections of the

fuse link will simultaneously melt (within a matter of two or three-

thousandths of a second in the event of a high-level fault current).

The high total resistance of the multiple arcs, together with thequenching effects of the filler particles, results in rapid arc sup-

pression and clearing of the circuit. (Refer to Figures 4 & 5) Short-

circuit current is cut off in less than a half-cycle, long before the

short-circuit current can reach its full value (fuse operating in its

current limiting range).

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Fuse Technology

Figure 2. Under sustained overload, a section of the link melts and an

arc is established.

Figure 3. The “open” single-element fuse after opening a circuit

overload.

Figure 4. When subjected to a short-circuit current, several

sections of the fuse link melt almost instantly.

Figure 5. The “open” single-element fuse after opening a short circuit.

Figure 1. Cutaway view of typical single-element fuse.



Dual-Element, Time-Delay Fuses as Manufactured

by Bussmann

Unlike single-element fuses, the dual-element, time-delay fuse

can be applied in circuits subject to temporary motor overloads

and surge currents to provide both high performance short-

circuit and overload protection. Oversizing in order to prevent

nuisance openings is not necessary. The dual-element, time-

delay fuse contains two distinctly separate types of elements

(Figure 6). Electrically, the two elements are series connected.

The fuse links similar to those used in the non-time-delay fuse

perform the short-circuit protection function; the overload ele-

ment provides protection against low-level overcurrents or over-

loads and will hold an overload which is five times greater than

the ampere rating of the fuse for a minimum time of 10 seconds.

As shown in Figure 6, the overload section consists of a copper

heat absorber and a spring operated trigger assembly. The heat

absorber bar is permanently connected to the heat absorberextension (left end of illustration) and to the short-circuit link on

the opposite end of the fuse by the “S”-shaped connector of the

trigger assembly. The connector electrically joins the short-circuit

link to the heat absorber in the overload section of the fuse.

These elements are joined by a “calibrated” fusing alloy. As

depicted in Figure 7, an overload current causes heating of the

short-circuit link connected to the trigger assembly. Transfer of

heat from the short-circuit link to the heat absorbing bar in the

mid-section of the fuse begins to raise the temperature of the

heat absorber. If the overload is sustained, the temperature of the

heat absorber eventually reaches a level which permits the trig-

ger spring to “fracture” the calibrated fusing alloy and pull the

connector free of the short-circuit link and the heat absorber. As

a result, the short-circuit link is electrically disconnected from the

heat absorber, the conducting path through the fuse is opened,

and overload current is interrupted (See Figure 8.). A critical

aspect of the fusing alloy is that it retains its original characteris-

tic after repeated temporary overloads without degradation.

When subjected to a short circuit current, the restricted sections

of the short-circuit link will simultaneously melt (within a matter of

two or three-thousandths of a second in the event of a high-level

fault current). The high total resistance of the multiple arcs,

together with the quenching effects of the filler particles, results in

rapid arc suppression and clearing of the circuit. (Refer to Figures

9 & 10.)BUSS dual-element fuses, typically LOW-PEAK YELLOW™ and

FUSETRON® fuses, utilize the spring-loaded design in the over-

load element.

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Trigger Assembly

Spring

Overload

Element

Short-CircuitElement

Heat Absorber

Short-CircuitLink

Calibrated Fusing Alloy and “S” Connector

Figure 7. Under sustained overload conditions, the trigger spring fracturesthe calibrated fusing alloy and releases the “connector”.

Figure 8. The “open” dual-element fuse after opening under an overloadcondition.

Figure 10. The “open” dual-element fuse after opening under a short-circuit condition.

Figure 9. Like the single element fuse, a short-circuit current causes the

restricted portions of the short-circuit elements to melt. Arcing to burnback the resulting gaps occurs until the arcs are suppressed by the arc

quenching material and the increased arc resistance.

Figure 6. The true dual-element fuse has distinct and separate overload

and short-circuit elements.



Fuse Time-Current Curves

When a low level overcurrent occurs, a long interval of time will

be required for a fuse to open (melt) and clear the fault. On the

other hand, if the overcurrent is large, the fuse will open very

quickly. The opening time is a function of the magnitude of the

level of overcurrent. Overcurrent levels and the corresponding

intervals of opening times are logarithmically plotted in graph

form as shown to the right. Levels of overcurrent are scaled on

the horizontal axis; time intervals on the vertical axis. The curve is

thus called a “time-current” curve.

This particular plot reflects the characteristics of a 200 ampere,

250 volt, LOW-PEAK YELLOW dual-element fuse. Note that at

the 1,000 ampere overload level, the time interval which is

required for the fuse to open is 10 seconds. Yet, at approximate-

ly the 2,200 ampere overcurrent level, the opening (melt) time of

a fuse is only 0.01 seconds. It is apparent that the time intervals

become shorter as the overcurrent levels become larger. Thisrelationship is termed an inverse time-to-current characteristic.

Time-current curves are published or are available on most com-

monly used fuses showing “minimum melt,” “average melt”

and/or “total clear” characteristics. Although upstream and

downstream fuses are easily coordinated by adhering to simple

ampere ratios, these time-current curves permit close or critical

analysis of coordination.

Better Motor Protection in Elevated Ambients

The derating of dual-element fuses based on increased ambient

temperatures closely parallels the derating curve of motors in ele-

vated ambient. This unique feature allows for optimum protection

of motors, even in high temperatures.

Affect of ambient temperature on operating characteristics of FUSETRONand LOW-PEAK YELLOW Dual-Element Fuses.

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Fuse Technology

400

300

200

10080

60

40

30

20

108

6

4

3

2

1.8

.6

.4

.3

.2

.1.08

.06

.04

.03

.02

.01

1 0

0

2 0

0

3 0

0

4 0

0

6 0

0

8 0

0

1 , 0 0

0

2 , 0 0

0

3 , 0 0

0

4 , 0 0

0

6 , 0 0

0

8 , 0 0

0

1 0 , 0 0

0

T I M E I N S E C O N D S

CURRENT IN AMPERES

LOW-PEAK YELLOWLPN-RK200 SP (RK1)

150

140

130

120

110

100

90

80

70

60

50

40

30

AMBIENT

P E R C E N T O F R A T I N G O R

O P E N I N G T I M E

Affect on CarryingCapacity Rating

Affect onOpening Time

–76°F( –60°C)

–40°F( –40°C)

–4°F( –20°C)

–32°F(0°C)

68°F(20°C)

104°F(40°C)

140°F(60°C)

176°F(80°C)

212°F(100°C)



In the above illustration, a grooved ring in one ferrule provides the

rejection feature of the Class R fuse in contrast to the lower

interrupting rating, non-rejection type.

Branch-Circuit Listed Fuses

Branch-circuit listed fuses are designed to prevent the installationof fuses that cannot provide a comparable level of protection to

equipment.

The characteristics of Branch-circuit fuses are:

1. They must have a minimum interrupting rating of 10,000

amps.

2. They must have a minimum voltage rating of 125 volts.

3. They must be size rejecting such that a fuse of a lower

voltage rating cannot be installed in the circuit.

4. They must be size rejecting such that a fuse with a current

rating higher than the fuseholder rating cannot be installed.

Better Protection Against Motor Single Phasing

When secondary single-phasing occurs, the current in the remain-

ing phases increases to approximately 200% rated full load

current. (Theoretically 173%, but change in efficiency and power

factor make it about 200%.) When primary single-phasing

occurs, unbalanced voltages occur on the motor circuit causing

currents to rise to 115%, and 230% of normal running currents

in delta-wye systems.

Dual-element fuses sized for motor running overload protection

will help to protect motors against the possible damages of

single-phasing.

Classes of Fuses

Safety is the industry mandate. However, proper selection, overall

functional performance and reliability of a product are factors

which are not within the basic scope of listing agency activities.

In order to develop its safety test procedures, listing agencies

develop basic performance and physical specifications or stan-

dards for a product. In the case of fuses, these standards have

culminated in the establishment of distinct classes of low-voltage

(600 volts or less) fuses; classes RK1, RK5, G, L, T, J, H and CC

being the more important.

The fact that a particular type of fuse has, for instance, a classifi-

cation of RK1, does not signify that it has the identical function or

performance characteristics as other RK1 fuses. In fact, the LIM-

ITRON® non-time-delay fuse and the LOW-PEAK YELLOW™

dual-element, time-delay fuse are both classified as RK1.

Substantial differences in these two RK1 fuses usually requires

considerable difference in sizing. Dimensional specifications of

each class of fuse does serve as a uniform standard.Class R Fuses

Class R (“R” for rejection) fuses are high performance, ⁄Ω¡º to 600

ampere units, 250 volt and 600 volt, having a high degree of cur-

rent limitation and a short-circuit interrupting rating of up to

300,000 amperes (rms symmetrical). BUSS Class R's include

Classes RK1 LOW-PEAK YELLOW™ and LIMITRON® fuses, and

RK5 FUSETRON® fuses. They have replaced BUSS K1 LOW-

PEAK and LIMITRON fuses and K5 FUSETRON fuses. These

fuses are identical, with the exception of a modification in the

mounting configuration called a “rejection feature”. This feature

permits Class R fuses to be mounted in rejection type fuseclips.

“R” type fuseclips prevent older type Class H, ONE-TIME and

RENEWABLE fuses from being installed. The use of Class R fuse-

holders is thus an important safeguard. The application of Class R

fuses in such equipment as disconnect switches permits the

equipment to have a high interrupting rating. NEC Articles 110-9

and 230-65 require that protective devices have adequate capac-

ity to interrupt short-circuit currents. Article 240-60(b) requires

fuseholders for current-limiting fuses to reject non-current-limiting

type fuses.

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Fuse Technology



Bussmann®

199

Fuse Diagnostic Chart

E l e c t r i c

H e a t

( N . E . C . 4 2 4 )

E l e c t r i c S p a c e H e a t i n g

E l e c t r i c B o i l e r s w i t h

R e s i s t a n c e T y p e I m m e r s i o n

H e a t i n g E l e m

e n t s i n a n A S M E

R a t e d a n d S t a m p e d V e s s e l .

I n d o o r

O u t d o o r

B a l l a s t s

O n l o a d s i d

e o f

m o t o r r u n n

i n g

o v e r c u r r e n t d e v i c e

C a p a c i t o r s

( N . E . C . 4 6 0 )

P r o t e c t e d b y

T i m e - D

e l a y

F u s e s

P r o t e c t e d b y

N o n - T i m e D e l a y

F u s e s

1 5 0 % t o

1 7 5 %

o f f u l l l o a d c u r r e n t

2 5 0 % t o

3 0 0 %

o f f u l l l o a d c u r r e n t

0 - 2 5 0 V L P N - R K_

S P ,

F R N - R

2 5 1 - 6 0 0 V L P S - R K_

S P ,

F R S - R

0 - 6 0 0 V F N Q - R ,

L P J_

S P ,

L P - C

C

0 - 2 5 0 V K T N - R ,

N O N

0 - 3 0 0 V J J N

2 5 1 - 6 0 0 V K T S - R ,

N O S

0 - 6 0 0 V J K S ,

K T K - R

3 0 1 - 6 0 0 V J J S

P r o t e c t i o n r e c o m m e n d e d

a s s h o w n b e l o w ,

b u t n o t

r e q u i r e d

M e r c u r y ,

S o d i u m ,

e t c .

A l l O t h e r

( M e r c u r y ,

S o d i u m ,

e t c . )

F l u o r e s c e n t

C o n s u l t f i x t u r e m a n u f a c t u r e r f o r s i z e a n d t y p e .



S i z e a t 1 2 5 % o

r n e x t s i z e l a r g e r b u t i n n o c a s e l a r g e r t h a n 1 5 0 a m p e r e s f o r e a c h s u b d i v i d e d

l o a d .

S i z e a t 1 2 5 % o

r n e x t s i z e l a r g e r b u t i n n o c a s e l a r g e r t h a n 6 0 a m p e r e s f o r e a c h s u b d i v i d e d l o

a d .

0 - 2 5 0 V L P N - R K_

S P ,

F R N - R ,

N O N

0 - 3 0 0 V J J N

0 - 4 8 0 V S C

2 5 1 - 6 0 0 V L P S - R K_

S P ,

F R S - R ,

N O S

3 0 1 - 6 0 0 V J J S

0 - 6 0 0 V L P J_

S P ,

L P - C

C , F N

Q - R ,

J K S ,

K T K - R

F u s e

G L R

G M F

G R F

B A F

B A N

K T K

F N M

F N Q

F N W

B A F

B A N

K T K

F N M

F N Q

F N W

H o l d e r

H L R

H P F

H P S

H E B

H E X

H P C - D

F u s e

G L Q

G M Q

K T K - R

F N Q - R

L P - C

C

K T Q

B B S

K T K - R

F N Q - R

L P - C

C

H o l d e r

H L Q

H P S - R R

H P F - R R

H P S - L

H P F - L

H E Y

F u s e

S C - 0 - 1 5

S C 2 0

S C 2 5 - 3 0

H o l d e r

H P F - E E

H P S - E E

H P F - J J

H P S - J J

H P F - F F

H P S - F F

B a s e d o n

1 9 9 6 N . E . C . ®

F u s e

F u s e



Bussmann®

200

KRP-C, Class L Fuses

Time-Current & Current Limitation Curves

300

100

10

1

.1

.01

1 , 0 0 0

1 0 , 0 0 0

1 0 0 , 0 0 0

2 0 0 , 0 0 0

CURRENT IN AMPERES

T I M E I N

S E C O N D S

8 0 0 A

1 2 0 0

A

1 6 0 0

A

2 0 0 0

A

2 5 0 0

A

3 0 0 0

A

4 0 0 0

A

5 0 0 0

A

6 0 0 0

A

AMPERE

RATING400,000

10,000

1,000

1 0 ,

0 0 0

2 0 0 ,

0 0 0

I N S T A N T A N E O U S P E

A K L E T - T H R U

C U R R E N T I N A M P S

1 0 0 ,

0 0 0

100,000

A M P E R E

R A T I N G

6,0005,0004,0003,0002,5002,0001,6001,200

800

601

A

B

1 ,

0 0 0

KRP-C Time-Current Characteristic Curves—

Average Melt

KRP-C Current Limitation Curves

PROSPECTIVE SHORT-CIRCUIT CURRENTSYMMETRICAL RMS AMPERES



Bussmann®

201

LPN-RK (250V) Class RK1 Fuses

LPN-RK_SP (250V)

300

100

10

1

.1

.01

2 0

1 0 0

1 , 0

0 0

1 0

, 0 0 0

RMS SYMMETRICAL CURRENT IN AMPERES

T I M E I N

S E C O N D S

2 0 A

6 0 A

1 0 0 A

2 0 0 A

3 0 A

4 0 0 A

6 0 0 A

1 5 A AMPERE

RATING

LPN-RK_SP (250V)

1 / 1 0

2 / 1 0

1 5 / 1 0 0

3 / 1 0

4 / 1 0

6 / 1 0

1 / 2

8 / 1 0

1

1 - 1 / 4

1 - 6 / 1 0

2

2 - 1 / 2

3 - 2 / 1 0 4

5

6 - 1 / 4

8

1 0

1 2

AMPERERATING

300

10

1

.1

.01

T I M E I N

S E C O N D S

. 1 1 1 0

1 0 0

1 , 0

0 0

CURRENT IN AMPERES

Time-Current Characteristic Curves— Average Melt Time-Current Characteristic Curves— Average Melt


Current Limitation Curves

A

B

600

400

200

100

A M P E R E

R A T I N G

400,000

100,000

10,000

1,000

1 , 0

0 0

1 0 , 0

0 0

1 0 0 , 0

0 0

2 0 0 , 0

0 0

RMS SYMMETRICAL CURRENTS IN AMPERES

A–B=ASYMMETRICAL AVAILABLE PEAK (2.3 X SYMM RMS AMPS)

I N S T A N T A N E O U S P E A K

L E T - T

H R U


60

30

LPN-RK_SP (250V)



Bussmann®

202


LPS-RK (600V) Class RK1 Fuses

2 0 A

6 0 A

1 0 0

A

2 0 0

A

3 0 A

4 0 0

A

AMPERERATING 6 0 0

A

LPS-RK(600V)

3 0

1 0 0

1 , 0

0 0

1 0 , 0

0 0

2 0 , 0

0 0

300

100

10

1

.1

.01

CURRENT IN AMPERES

T I M E I N

S E C O N D S

. 1 . 2

. 1 5

. 3 . 4 . 6

. 5

. 8 1

1 . 2

5

1 . 6 2

2 . 5

3 . 2 4 5

6 . 2

5

8 1 0

1 2 AMPERE RATING

300

100

10

1

.1

.01 . 1 1

1 0

1 0 0

1

, 0 0 0

T I M E I N

S E

C O N D S



60

30

A

B

600

400

200

A M P E R E

R A T I N G

400,000

100,000

10,000

1,000

1 , 0

0 0

1 0 , 0

0 0

1 0 0 , 0

0 0

2 0 0 , 0

0 0

I N S T A N T A N E O U S P E A K L

E T - T H R U


100


LPS-RK(600V)



Bussmann®

203

FRN-R (250V) Class RK5 Fuses


2 0

1 0 0

1 , 0

0 0

1 0

, 0 0 0

2 0

, 0 0 0

10

1

.1

.01

T I M E I N

S E C O N D S

CURRENT IN AMPERES

FRN-R(250V)

6 0 A

1 0 0 A

2 0 0 A

3 0 A

4 0 0 A

AMPERERATING 6

0 0 A

1 5 A

300

100FRN-R (250V)

1 / 1 0

2 / 1 0

1 5 / 1 0 0

3 / 1 0

4 / 1 0

6 / 1 0

1 / 2

8 / 1 0

1

1 - 1

/ 4

1 - 6

/ 1 0

2

2 - 1

/ 2

3 - 2

/ 1 0 4

5

6 - 1

/ 4

8

1 0

1 2

AMPERERATING

300

100

10

1

.1

.01

T I M E I N

S E C O N

D S

. 1 1 1 0

1 0 0

1 , 0

0 0

CURRENT IN AMPERES



I N S T A N T A N E O U S P E A K L E

T - T H R U C U R R E N T A M P E R E S

PROSPECTIVE SHORT CIRCUIT CURRENTSYMMETRICAL RMS AMPERES

400,000

100,000

10,000

1,000

1 , 0

0 0

1 0 , 0

0 0

1 0 0 , 0

0 0

2 0 0 , 0

0 0

60

600

100

A M P E R E

R A T I N G

400

200

B

A

30

FRN-R (250V)



Bussmann®

204

FRS-R (600V) Class RK5 Fuses


CURRENT IN AMPERES

2 0

1 0 0

1 , 0

0 0

1 0 , 0

0 0

3 0 , 0

0 0

300

100

10

1

.1

.01

T I M E I N

S E C O N D S

6 0 A

1 0 0 A

2 0 0 A

3 0 A

4 0 0 A

AMPERERATING 6

0 0 A

1 5 A

FRS-R600V

1 / 1 0

2 / 1 0

1 5 / 1 0 0

3 / 1 0

4 / 1 0

6 / 1 0

1 / 2

8 / 1 0

1

1 - 1

/ 4

1 - 6

/ 1 0 2

2 - 1

/ 2 3 - 2

/ 1 0

4 5

6 - 1

/ 4

8

1 0

1 2 AMPERE

RATING

FRS-R(600V)

300

100

10

1

.1

T I M E I N

S E C O

N D S

.01 . 1 1

1 0

1 0 0

1

, 0 0 0

CURRENT IN AMPERES



600

100

A M P E R E

R A T I N G

400

200

30

60

I N S T A N T A N E O U S P E A K

L E T T H R U

C U R R E N T A M P E R E S

PROSPECTIVE SHORT CIRCUIT CURRENTSYMMETRICAL RMS AMPERES

B

A

400,000

100,000

10,000

1,000

1 , 0

0 0

1 0

, 0 0 0

1 0 0

, 0 0 0

2 0 0

, 0 0 0

FRS-R (600V)



Bussmann®

205

KTN-R (250V) Class RK1 Fuses



T I M E I N

S E C O N D S

300

100

10

1

.1

.01

4 0

1 0 0

1 , 0

0 0

1 0

, 0 0 0

3 0 A

6 0 A

1 0 0

A

2 0 0

A

4 0 0

A

6 0 0

A

AMPERERATING

600

100

60

A M P E R E

R A T I N G

30

400

200

I N S T A N T A N E O U S

P E A K L E T - T

H R U


400,000

100,000

10,000

1,000

1 , 0

0 0

1 0

, 0 0 0

1 0 0

, 0 0 0

2 0 0

, 0 0 0

RMS SYMMETRICAL CURRENTS IN AMPERESA–B=ASYMMETRICAL AVAILABLE PEAK (2.3 X SYMM RMS AMPS)

A

B

Time-Current Characteristic Curves— Average Melt Current Limitation Curves

KTN-R(250V)

KTN-R(250V)



Bussmann®

206

KTS-R (600V) Class RK1 Fuses



T I M E I N

S E C O N D S

300

100

10

1

.1

.01

4 0

1 0 0

1 , 0

0 0

1 0 , 0

0 0

3 0 A

6 0 A

1 0 0

A

2 0 0

A

4 0 0

A

6 0 0

A

AMPERERATING

600

100

60

A M P E R E

R A T I N G

30

400

200

2 0 0 , 0

0 0

1 0 0 , 0

0 0

1 0 , 0

0 0

1 , 0

0 0

1,000

I N S T A N T A N E

O U S P E A K L E T - T H R U

C U R R E N T I N A M P S400,000

100,000

10,000


B

A

Time-Current Characteristic Curves— Average Melt Current Limitation Curves

KTS-R(600V)

KTS-R(600V)



Bussmann®

207

LPJ (600V), Class J Fuses


AMPERERATING 1 A

3 A

5 A

1 0 A

1 5 A

2 0 A

3 0 A

4 0 A

5 0 A

6 0 A

300

100

10

1

.1

.01

T I M E I N

S E C O N D S

1 0

, 0 0 0

1 , 0

0 0

1 0 0

1 0 1


1 0 0

A

1 2 5

A

2 0 0

A

2 2 5

A

4 0 0

A

6 0 0

A

I N S T A N T A N E O U S P E A K L E T - T H R U

C U R R E N T I N A M P S100,000

10,000

1,000

100

B

A

PROSPECTIVE SHORT-CIRCUIT CURRENTSYMMETRICAL RMS AMPS

1 0 0

1 , 0

0 0

1 0 , 0

0 0

1 0 0 , 0

0 0

2 0 0 , 0

0 0

600A400A

200A

100A60A50A40A30A20A15A

A M P E R E

R A T I N G

Time-Current Characteristic Curves—

Average Melt


LPJLPJ



Bussmann®

208

JJN & JJS, Class T Fuses



Current Limitation Curves Current Limitation Curves

600

400200

100

60

3015

A M P E R E

R A T I N G

8001200



RMS SYMMETRICAL CURRENTS IN AMPERESA-B = ASYMMETRICAL AVAILABLE PEAK (2.3 x SYMM RMS AMPS)

100,000

10,000

1,000

200

1 0 0

1 , 0

0 0

1 0

, 0 0 0

1 0 0

, 0 0 0

2 0 0

, 0 0 0

400,000B

A

600

400

200

10060

30

A M P E R E

R A T I N G

8001200



100,000

10,000

1,000

200

1 0 0

1 , 0

0 0

1 0

, 0 0 0

1 0 0

, 0 0 0

2 0 0

, 0 0 0

400,000B

A



T I M E I N

S E C O N D S

2 0

1 0 0

1 , 0

0 0

1 0

, 0 0 0

300

100

10

1

.1

.01

6 0 A

1 0 0 A

2 0 0 A

3 0 A

4 0 0 A AMPERE

RATING 6 0 0 A

1 5 A

JJN

1 A

3 A

5 A

1 0 A

3 0 A

1 5 A

6 0 A

2 0 0 A

4 0 0 A

5 0 0 A

1 0 0 A

8 0 0 A

AMPERERATING

1 0

, 0 0 0

1 , 0

0 0

1 0 0

1 0 1

300

100

10

1

.1

.01

CURRENT IN AMPERES

T I M E I N

S E C O N D S

(300V)

JJS(600V)

JJS(600V)

JJN(300V)



Bussmann®

209

LP-CC & FNQ-R Class CC Fuses


200

100

10

T I M E I N S E C O N D S

1

.1

.01

⁄ Ω ™ fl Ω ¡ º ° Ω ¡ º 1 1 ⁄ Ω ¢

3 3 ⁄ Ω ™

4 4 ⁄ Ω ™

6 8 1 0 1 2 1 5 2 0 2 5 3 0

AMPERE

RATING

. 4 1 1 0 1 0 0

1 0 0 0

CURRENT IN AMPERES

.

4 1

1

0

1 0

0

2 0

0


100

10

1

.1

.01

T I M E I N

S E C O N D S

1 / 2

1 3 5 7 - 1

/ 2

AMPERERATING


LP-CC FNQ-R



Bussmann®

210

KTK-R, Class CC Fuses



T I M E I N

S E C O N D S

1 0

1 0 0

4 0 0 1

1 0

A

2 0

A

3 A

AMPERERATING 2 A 1 A 5 A 8 A 1 5

A

3 0

A

300

100

10

1

.1

.01

Time-Current Characteristic Curves— Average Melt

KTK-R



Ampere

The measurement of intensity of rate of flow of

electrons in an electric circuit. An ampere is

the amount of current that will flow through a

resistance of one ohm under a pressure of onevolt.

Ampere Rating

The current-carrying capacity of a fuse. When

a fuse is subjected to a current above its

ampere rating, it will open the circuit after a

predetermined period of time.

Ampere Squared Seconds, l2t

The measure of heat energy developed within

a circuit during the fuse’s clearing. It can be

expressed as “melting l2t”, “arcing l2t” or the

sum of them as “Clearing l2t”. “l” stands for

effective let-through current (RMS), which is

squared, and “t” stands for time of opening, in

seconds.

Arcing Time

The amount of time from the instant the fuselink has melted until the overcurrent is inter-

rupted, or cleared.

Breaking Capacity

(See Interrupting Rating)

Cartridge Fuse

A fuse consisting of a current responsive ele-

ment inside a fuse tube with terminals on both

ends.

Class CC Fuses

600V, 200,000 ampere interrupting rating,

branch circuit fuses with overall dimensions of

⁄‹Ω£™∑ ≈ 1⁄Ω™∑ . Their design incorporates a rejec-

tion feature that allows them to be inserted

into rejection fuse holders and fuse blocks

that reject all lower voltage, lower interruptingrating ⁄‹Ω£™∑ ≈ 1⁄Ω™∑ fuses. They are available

from ⁄Ω¡º amp through 30 amps.

Class G Fuses

480V, 100,000 ampere interrupting rating

branch circuit fuses that are size rejecting to

eliminate overfusing. The fuse diameter is

⁄‹Ω£™∑ while the length varies from 1fiΩ¡§∑ to 2⁄Ω¢∑ .

These are available in ratings from 1 amp

through 60 amps.

Class H Fuses

250V and 600V, 10,000 ampere interrupting

rating branch circuit fuses that may be renew-

able or non-renewable. These are available in

ampere ratings of 1 amp through 600 amps.

Class J Fuses

These fuses are rated to interrupt a minimumof 200,000 amperes AC. They are labelled

as “Current-Limiting”, are rated for 600 volts

AC, and are not interchangeable with other

classes.

Class K Fuses

These are fuses listed as K-1, K-5, or K-9

fuses. Each subclass has designated I2t and lpmaximums. These are dimensionally the same

as Class H fuses, and they can have interrupt-ing ratings of 50,000, 100,000, or 200,000

amps. These fuses are current-limiting.

However, they are not marked “current-limit-

ing” on their label since they do not have a

rejection feature.

Class L Fuses

These fuses are rated for 601 through 6000

amperes, and are rated to interrupt a minimum

of 200,000 amperes AC. They are labelled

“Current-Limiting” and are rated for 600 volts

AC. They are intended to be bolted into their

mountings and are not normally used in clips.

Some Class L fuses have designed in time-delay

features for all purpose use.

Class R Fuses

These are high performance fuses rated ⁄Ω¡º-600 amps in 250 volt and 600 volt ratings. All

are marked “Current Limiting” on their label

and all have a minimum of 200,000 amp inter-

rupting rating. They have identical outline

dimensions with the Class H fuses but have a

rejection feature which prevents the user from

mounting a fuse of lesser capabilities (lower

interrupting capacity) when used with special

Class R Clips. Class R fuses will fit into either

rejection or non-rejection clips.

Class T Fuses

An industry class of fuses in 300 volt and 600

volt ratings from 1 amp through 1200 amps.

They are physically very small and can be

applied where space is at a premium. They are

fast acting and time-lag fuses, with an inter-rupting rating of 200,000 amps RMS.

Classes of Fuses

The industry has developed basic physical

specifications and electrical performance

requirements for fuses with voltage ratings of

600 volts or less. These are known as stan-

dards. If a type of fuse meets the requirements

of a standard, it can fall into that class. Typical

classes are K, RK1, RK5, G, L, H, T, CC, and J.

Clearing Time

The total time between the beginning of the

overcurrent and the final opening of the circuit

at rated voltage by an overcurrent protective

device. Clearing time is the total of the melt-

ing time and the arcing time.

Current Limitation

A fuse operation relating to short circuits only.

When a fuse operates in its current-limiting

range, it will clear a short circuit in less than ⁄Ω™

cycle. Also, it will limit the instantaneous peak

let-through current to a value substantially

less than that obtainable in the same circuit if

that fuse were replaced with a solid conduc-

tor of equal impedance.

Dual Element Fuse

Fuse with a special design that utilizes two

individual elements in series inside the fuse

tube. One element, the spring actuated trig-

ger assembly, operates on overloads up to5-6 times the fuse current rating. The other

element, the short circuit section, operates on

short circuits up to their interrupting rating.

Electrical Load

That part of the electrical system which actu-

ally uses the energy or does the work

required.

Fast Acting Fuse

A fuse which opens on overload and short

circuits very quickly. This type of fuse is not

designed to withstand temporary overload

currents associated with some electrical

loads.

Fuse

An overcurrent protective device with a fusible

link that operates and opens the circuit on anovercurrent condition.

High Speed Fuses

Fuses with no intentional time-delay in the

overload range and designed to open as

quickly as possible in the short-circuit range.

These fuses are often used to protect solid-

state devices.

Inductive Load

An electrical load which pulls a large amount

of current—an inrush current—when first

energized. After a few cycles or seconds the

current “settles down” to the full-load running

current.

Interrupting Capacity

See Interrupting RatingInterrupting Rating

(Breaking Capacity)

The rating which defines a fuse’s ability to

s afely interrupt and clear short circuits. This

rating is much greater than the ampere rating

of a fuse. The NEC® defines Interrupting

Rating as “The highest current at rated volt-

age that an overcurrent protective device is

intended to interrupt under standard test

conditions.”

Melting Time

The amount of time required to melt the fuse

link during a specified overcurrent. (See

Arcing Time and Clearing Time.)

“NEC” Dimensions

These are dimensions once referenced in theNational Electrical Code. They are common to

Class H and K fuses and provide inter-

changeability between manufacturers for

fuses and fusible equipment of given ampere

and voltage ratings.

Ohm

The unit of measure for electric resistance. An

ohm is the amount of resistance that will allow

one ampere to flow under a pressure of one

volt.

Bussmann®

211

Glossary of Terms



Threshold Current

The symmetrical RMS available current at the

threshold of the current-limiting range, where

the fuse becomes current-limiting when test-

ed to the industry standard. This value can beread off of a peak let-through chart where the

fuse curve intersects the A-B line. A threshold

ratio is the relationship of the threshold cur-

rent to the fuse’s continuous current rating.

Time-Delay Fuse

A fuse with a built-in delay that allows tempo-

rary and harmless inrush currents to pass

without opening, but is so designed to open

on sustained overloads and short circuits.

Voltage Rating

The maximum open circuit voltage in which a

fuse can be used, yet safely interrupt an over-

current. Exceeding the voltage rating of a fuse

impairs its ability to clear an overload or short

circuit safely.

Withstand Rating The maximum current that an unprotected

electrical component can sustain for a speci-

fied period of time without the occurrence of

extensive damage.

R.M.S. Current

The R.M.S. (root-mean-square) value of any

periodic current is equal to the value of the

direct current which, flowing through a resis-

tance, produces the same heating effect inthe resistance as the periodic current does.

Semiconductor Fuses

Fuses used to protect solid-state devices.

See “High Speed Fuses”.

Short Circuit

Can be classified as an overcurrent which

exceeds the normal full load current of a cir-

cuit by a factor many times (tens, hundreds or

thousands greater). Also characteristic of this

type of overcurrent is that it leaves the normal

current carrying path of the circuit—it takes a

“short cut” around the load and back to the

source.

Short-Circuit Rating

The maximum short-circuit current an electri-

cal component can sustain without the occur-rence of excessive damage when protected

with an overcurrent protective device.

Short-Circuit Withstand Rating

Same definition as short-circuit rating.

Single Phasing

That condition which occurs when one phase

of a three phase system opens, either in a low

voltage (secondary) or high voltage (primary)

distribution system. Primary or secondary sin-

gle phasing can be caused by any number of

events. This condition results in unbalanced

currents in polyphase motors and unless pro-

tective measures are taken, causes overheat-

ing and failure.

Ohm’s Law

The relationship between voltage, current,

and resistance, expressed by the equation E

= IR, where E is the voltage in volts, I is the

current in amperes, and R is the resistance inohms.

One Time Fuses

Generic term used to describe a Class H

nonrenewable cartridge fuse, with a single

element.

Overcurrent

A condition which exists on an electrical

circuit when the normal load current is

exceeded. Overcurrents take on two separate

characteristics—overloads and short circuits.

Overload

Can be classified as an overcurrent which

exceeds the normal full load current of a circuit.

Also characteristic of this type of overcurrent is

that it does not leave the normal current car-

rying path of the circuit—that is, it flows fromthe source, through the conductors, through

the load, back through the conductors, to the

source again.

Peak Let-Through Current, lp

The instantaneous value of peak current let-

through by a current-limiting fuse, when it

operates in its current-limiting range.

Renewable Fuse (600V & below)

A fuse in which the element, typically a zinc

link, may be replaced after the fuse has

opened, and then reused. Renewable fuses

are made to Class H standards.

Resistive Load

An electrical load which is characteristic of

not having any significant inrush current.When a resistive load is energized, the current

rises instantly to its steady-state value, with-

out first rising to a higher value.

Bussmann®

212

Glossary of Terms



CatalogSymbol Page

AAO 176

ABC 32

ABCNA 156

ABFNA 156

ABGNA 156

ABWNA 156

AC 177

AD 177

ADLSJ 155

ADOSJ 155

AGA 30

AGC 32

AGU 34

AGW 30

AGX 30

AMWNA 156

ANL 36

ANN 36

ATC 38

ATM 38

B22 43

BAF 22

BAN 22

BAO 176

BBS 21

BC 73, 177

BCCM 79

BC6031 79

BC6032 79

BC6033 79

BD 177

BDAUX 57

BDH 46, 47, 49, 54, 56, 59

BDNF 52, 56

BDS 47, 50, 56

BDST 47BDTA 48, 50

BDTL 48, 50, 57

BDTS 57

BDZX 57

BG 79

BG3011 79

BG3012 79

BG3013 79

BG3021 79

BG3022 79

BG3023 79

BG3031 79

BG3032 79

BG3033 79

BH-0_ _ _ 88, 122, 139

BH-1_ _ _ 88, 122, 139

BH-2_ _ _ 88, 122, 139

BH-3_ _ _ 88, 122, 139

BM 79

BM6031 79

BM6032 79

BM6033 79

BNQ21 107

BP/AGX 189

BP/GLH 189

BP/MAS 189

BP/XMAS 189

BQQ41 107

C515 27

CatalogSymbol Page

C517 27

C518 27

C519 27

C520 27

C5268 122, 142

CAV 156

CAVH 156

CD 177

CDAUX 48

CDBY 54

CDH 45, 47, 53, 55, 59

CDHX 46, 47, 54, 56

CDHXB 49, 59

CDHXY 49, 59

CDHZX 55

CDMC 54

CDN 170

CDNF 51, 53, 55

CDS 45, 46, 53, 54, 170

CDSWM 54

CEO 176

CFC 48

CFD 44, 45, 47

CFTS 48

CFZ 48

CGL 171

CH 80

CIF06 172

CIF21 172

CIH 174

CIK 174

CIL 174

CJ 173

CM_ _CF 174

CS/XMAS 189

CT 141C_ _F 179

DD 177

DEO 176

DIN 124-130

DLN-R 12

DLS-R 12

DRA 196

ED 177

EDA 25

EET 135, 142

EF 177

EFC 58, 59, 60, 61

EFJ 58, 59, 60, 61

EFL 58, 59, 60, 61

EFS 177

EK 172

ENA 25

ENF 62, 63, 64, 65

ERK-28 187

ESD 176

ET 141, 142

FD 44, 49

FDM 190

FE 141, 142

FEE 141, 142

FF 177

FG 177

FL11H _ _ 159

FL11K _ _ 159

CatalogSymbol Page

FL11T _ _ 159

FM 141, 142

FMM 141, 142

FNA 35

FNM 23

FNQ 23

FNQ-R 20

FP 183

FR-1000 186

FRN-R 10, 186

FRS-R 10, 186

FT 183

FWA 116, 143

FWC 145

FWH 31, 118, 144

FWJ 121, 146

FWK 147

FWL 148

FWP 120, 145-146

FWS 148

FWX 117, 144

G 79

GBA 35

GBB 33

GDA 28

GDB 28

GDC 28

GF 177

GG 177

GH 177

GLD 35

GLQ 37

GLR 37

GMA 29

GMC 29

GMD 29GMF 37

GMQ 37

GMT 167

GRF 37

H25 _ _ _ 66

H60 _ _ _ 68

HBH 84

HBV 84

HBW 84

HEB 94

HEC 94

HEG 94

HEH 94

HEJ 94

HET 94

HEX 94

HEY 94

HFA 93

HFB 92

HHB 92

HHC 95

HHD 95

HHF 95

HHG 95

HHL 95

HHM 95

HHT 93

HHX 95

HJL 91

CatalogSymbol Page

HK 91

HKL 91

HKP 86

HKR 91

HKT 91

HKU 91

HKX 91

HLD 91

HLQ 37

HLR 37

HLS 167

HLT 167

HM 93

HME 93

HMF 93

HMG 93

HMH 93

HMI 93

HMJ 93

HO7C 175

HPC-D 90

HPD 89

HPF 18, 89

HPG 89

HPM 90

HPS 89

HR 93

HRC 175, 179

HRE 93

HRF 93

HRG 93

HRH 93

HRI 93

HRJ 93

HRK 92

HTB 87-88HTC-140M 99

HTC-150M 99

HTC-15M 99

HTC-200M 99

HTC-210M 99

HTC-30M 85

HTC-35M 85

HTC-40M 85

HTC-45M 83

HTC-50M 83

HTC-55M 85

HTC-60M 83

HTC-65M 83

HTC-70M 85

HVA 157

HVB 157

HVJ 157

HVL 157

HVR 157

HVT 157

HVU 157

HVW 157

HVX 157

J-_ _ 184

J60030 70

J60060 70

J60100 70

J60200 70

J60400 70

CatalogSymbol Page

J60600 70

JCD 152

JCE 152

JCI 152

JCK 149

JCL 149

JCQ 152

JCT 152

JCU 154

JCW 152

JCX 153

JCY 153

JCZ 154

JDZ 154

JJN 17

JJS 17

JKS 16

JP60030 71

JT(N)60030 72-73

JT(N)60060 72-73

K 26

KAC 119

KAZ 36

KBC 119

KCA 26

KCB 26

KCC 26

KCD 26

KCE 26

KCF 26

KCH 26

KCJ 26

KCM 26

KCR 26

KCS 26

KCY 26KCZ 26

KDA 26

KDB 26

KDC 26

KDD 26

KDE 26

KDF 26

KDH 26

KDJ 26

KDM 26

KDP 26

KDR 26

KDT 26

KDY 26

KEW 26

KEX 26

KFH-A 26

KFM 26

KFT 26

KFZ 26

KIG 26

KLM 22

KLU 6

K07C 175

KPF 26

KQO 26

KQT 26

KQV 26

KRP-C 4-5

Bussmann®

213

Index by Part Number



CatalogSymbol Page

KT3 106

KT4 106

KTK 22

KTK-R 20

KTN-R 13

KTQ 21

KTS-R 13

KTU 6

L09C 175

L14C 175

LBS 181

LCT 140

LET 140, 142

LMMT 140, 142

LMT 140, 142

LP-CC 19

LPJ_SP 15

LPN-RK_SP 7-9

LPRK-28 187

LPS-RK_SP 7-9

M09C 175

M14C 175

MAX 38

MDA 34

MDL 33

MDQ 34

MIC 35

MIN 35

MIS 36

MMT 141

MT 141

MV055 151

MV155 151

N512 105

NC3 105

NDN 103NDN1 104

NDN111 104

NDN3 103

NDN63 103

NDNA 48, 104

NDNAS 104

NDNF1 108

NDNLFD1 108

NDNV4 103

NFT2 105

NFT3 105

NFTA 104

NH_G 180

NH_M 180

NH_G-690 180

NITD 176

NNB 184

NNB-R 184

NNC 184

NO. 1 185

NO. 140 188

NO. 15 186

NO. 2 185

NO. 200 189

NO. 201 189

NO. 205 189

NO. 213 184

NO. 216 184

NO. 220 184

CatalogSymbol Page

NO. 226 184

NO. 242 184

NO. 2621 184

NO. 263 184

NO. 2641 184

NO. 2642 184

NO. 2661 184

NO. 2662 184

NO. 2664 184

NO. 270 188

NO. 2880 189

NO. 3 185

NO. 36 187

NO. 4 185

NO. 5 185

NO. 6 185

NO. 626 184

NO. 7 185

NO. 8 185

NON 14

NOS 14

NRA 104

NSD 176

NSE3 105

NSS3 105

NTN-R 184

NTQ23 107

NTS-R 184

NZ_ _ _ 178

OEFMA 158

OEGMA 158

OHFMA 158

OHGMA 158

OLGMA 158

OPM-1038 39-40

OPM-CC 41OPM-SW 41

OPMRH 54

OSD 176

P09C 175

P11C 175

PCT 167

PFD-948 186

PLK3 106

PLU1 106

PLU3 106

PMP 113

PON 170

PS 113

PSU1 106

R11C 175

R25030 66-67

R25060 66-67

R25100 66-67

R25200 66-67

R25400 66-67

R25600 66-67

R60030 68-69

R60060 68-69

R60100 68-69

R60200 68-69

R60400 68-69

R60600 68-69

S 24

S-8000 96

CatalogSymbol Page

SA 25

SAMI 42

SB 181

SC 18

SCY 82

SDLSJ 155

SDMSJ 155

SDQSJ 155

SFC 183

SFLSJ 155

SFMSJ 155

SFQSJ 155

SKA 82

SKLSJ 155

SKMSJ 155

SL 24

SOA72 104

SOU 82

SOW 82

SOX 82

SOY 82

SOY-B 82

SRU 82

SRW 82

SRX 82

SRY 82

SSD 176

SSU 82

SSW 82

SSX 82

SSY 82

SSY-RL 82

SSY-L 82

STD 176

STY 82

T 24 TB 181

T30030 74-75

T30060 74-75

T30100 74-75

T30200 74-75

T60030 76-77

T60060 76-77

T60100 76-77

T60200 76-77

T60400 76-77

T60600 76-77

TDC10 32

TDC11 33

TDC180 31

TDC600 31

TL 24

TP15900-4 161

TP15914 160

TPA 161

TPA-B 161

TPL 164

TPN 165

TPS 162

TPSFH 183

TYPE D (_D_ _ ) 178

UB 108

VFNHA 150

VKNHA 150

VLB 181

CatalogSymbol Page

W 24

WDFHO 150

WDLSJ 150, 155

WDO 124

WDOH6 150

WDOSJ 155

WER 168

WFOH6 150

WFFHO 150

WFLSJ 150, 155

WFMSJ 150

WFNHO 150

WFOSJ 155

WJON6 150

WKFHO 150

WKLSJ 155

WKMSJ 150, 155

WKNHO 150

2499 96

4574 96

11 TYPE 168

11239 78

11240 78

11241 78

11242 78

11675 109

11725 109

14002 109

14004 109

15087 166

15100 163

15149 112

15200 163

15800 162

160_ _ _ 110

162_ _ _ 110163_ _ _ 110-111

165_ _ _ 110

170H_ _ _ _ 138

170M_ _ _ _ 125-137

1A1119 100

1A1120 100

1A1907 100

1A3398 100

1A3399 99

1A3400 101

1A4533 100

1A4534 100

1A5018 99

1A5600 101

1A5601 99

1A5602 99

24 TYPE 168

2NZ01 178

2601 78

2602 78

2604 78

2605 78

2607 78

2608 78

2610 78

2611 78

2960 157

3723 98

3742 98

CatalogSymbol Page

3743 98

3828 97

3835 98

4NZ01 178

4393 97

4421 98

4515 98

4520 97

4528 157

4529 157

4530 157

5591 102

5592 102

5672 102

5674 102

5681 102

5682 102

5956 102

5960 102

5TPH 183

6NZ01 178

64000 26

64200 26

64300 26

64400 26

64600 26

68000 26

68150 26

68200 26

68300 26

68400 26

68600 26

7 TYPE 168

70 SERIES 166

74 TYPE 169

75 TYPE 16976 TYPE 169

8000 96

80 TYPE 169

81 TYPE 168

Bussmann®

Index by Part Number

Bussmann Fuse Technology

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Transcript of Bussmann Fuse Technology