Introduction to Fuse
β’β’ A fuse is a safety device used in electrical
circuits.
β’ β’ Protects electrical equipment from
overcurrent.
β’ β’ Works by melting the fuse wire when
current exceeds limit.
4.
Need for Fuse
β’β’ Prevents damage to appliances.
β’ β’ Avoids risk of fire due to overheating.
β’ β’ Provides simple and cost-effective
protection.
5.
Construction of Fuse
β’β’ Consists of a fuse element (wire/strip).
β’ β’ Enclosed in a holder or casing.
β’ β’ Made of materials like copper, silver, or
aluminum.
6.
Working Principle
β’ β’Fuse operates on the heating effect of
current.
β’ β’ Excess current β excessive heat β fuse wire
melts.
β’ β’ Circuit breaks instantly to prevent damage.
7.
Characteristics of Fuse
β’β’ Current rating
β’ β’ Voltage rating
β’ β’ Breaking capacity
β’ β’ Response time
8.
Types of Fuse(Classification)
β’ Fuses are broadly classified into:
β’ β’ AC Fuses
β’ β’ DC Fuses
β’ β’ Based on size: Cartridge, Rewirable, etc.
9.
AC Fuse
β’ β’Specifically designed for alternating current
circuits.
β’ β’ Used in household and industrial
applications.
10.
DC Fuse
β’ β’Designed for direct current circuits.
β’ β’ Requires special design to avoid arc
formation.
11.
Cartridge Fuse
β’ β’Cylindrical shape with metal caps.
β’ β’ Commonly used in domestic wiring.
β’ β’ High reliability and replacement ease.
12.
Rewirable Fuse
β’ β’Contains a fuse carrier and base.
β’ β’ Fuse wire can be replaced easily after
operation.
β’ β’ Economical and reusable.
13.
Drop-out Fuse
β’ β’Used in high-voltage transmission lines.
β’ β’ Fuse element drops out when blown.
β’ β’ Provides visible indication of operation.
14.
HRC Fuse (HighRupturing Capacity)
β’ β’ Designed for high fault current capacity.
β’ β’ Filled with quartz powder to absorb arc
energy.
β’ β’ Used in industrial applications.
15.
Advantages of Fuse
β’β’ Simple design and low cost.
β’ β’ Quick response to overcurrent.
β’ β’ Maintenance-free in most cases.
16.
Disadvantages of Fuse
β’β’ Needs replacement after operation.
β’ β’ Not suitable for repeated tripping.
β’ β’ Limited breaking capacity compared to
circuit breakers.
17.
Applications of Fuse
β’β’ Household electrical appliances.
β’ β’ Industrial machines.
β’ β’ Automotive circuits.
β’ β’ Power systems protection.
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