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FUSE ADVANTAGES EDUPACK TRAINING MODULE

2012

EduPack Trainng Modules – Fuse Technology and Operation - Mersen© 2012 2

SAFETY

Metallic elements inside the fuse melt directly upon the fault current

Arc extinction totally enclosed

The arc flash energy is drastically reduced when the peak current is limited by a

fuse

EduPack Trainng Modules – Fuse Technology and Operation - Mersen© 2012 3

SPEED - PEAK-LET-THRU CURRENT

Current-limiting Circuit Breaker

i Non-limiting Circuit Breaker

t

Fuse

EduPack Trainng Modules – Fuse Technology and Operation - Mersen© 2012 4

BREAKING CAPACITY

100,000A 200,000A…

and even 300,000A!

EduPack Trainng Modules – Fuse Technology and Operation - Mersen© 2012 5

QUASI MAINTENANCE FREE

No maintenance before a short circuit

Maintenance after a short circuit = simplicity

EduPack Trainng Modules – Fuse Technology and Operation - Mersen© 2012 6

SELECTIVITY (DISCRIMINATION)

Transformer

F3

F2

Short circuit

Fault current

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POWER QUALITY

fuse current. per-unit

-25

0

25

1.52 1.56 1.6 1.64 time, sec

voltage at bus2, per-unit

1.52 1.56 1.6 1.64 time, sec

+2.4

0.0

-2.4

voltage at bus2, per-unit +2.4

0.0

-2.4

1.52 1.56 1.6 1.64 time, sec

-25

fault current. per-unit

0

25

1.52 1.56 1.6 1.64 time, sec

Transients in system protected by

non current-limiting devices

Transients in system protected by

current-limiting fuses

EduPack Trainng Modules – Fuse Technology and Operation - Mersen© 2012 8

FUTURE SYSTEM GROWTH

Fuses generally still comply owing to their initial large breaking capacities

Adding fuses upgrade the breaking capacity of the protection system

EduPack Trainng Modules – Fuse Technology and Operation - Mersen© 2012 9

LOW POWER LOSS

Cylindriucal

Fuse

Power loss in

Modulostar® fuse

holder

Circuit Breaker

32A gG or aM

Size 10x38 mm 3W 3.2W

50A gG or aM

Size 14x51 mm 5W 5W

125A aM

Size 22x58 mm 9.5W 14W

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RELIABILITY

Simplicity of the fuse concept

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UNIVERSALITY

Fuses can protect:

• Cables

• Transformers

• Motor circuits

• Capacitors

• Contactors

• Old circuit breakers

• Power electronic equipments

EduPack Trainng Modules – Fuse Technology and Operation - Mersen© 2012 12

PRICE

The most economical protection

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FUSE

Full overcurrent protection, Fdelity of operation

Universal use of Time-Delay fuse (ideal all-purpose fuse)

Selectivity, Simplicity, Safety

Economical, Energy limiting, Easy to use

F

U

S

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