Skip to content

Electricalterminology

Best Blog for Basic Electrical Knowledge

Primary Menu
  • Electric
  • Manufacturers & Brands
  • Electronics
  • About Us
  • Contact
  • Affiliate Disclosure
  • Home
  • Electric
  • Cartridge Fuse: Basics, Working principle, Types, Advantages
  • Electric

Cartridge Fuse: Basics, Working principle, Types, Advantages

electricalterminology 2 years ago
What is a cartridge fuse

Cartridge fuses, also known as cylindrical fuses, are a type of electrical fuse that are designed to protect electrical circuits from damage caused by overcurrents. They are commonly used in industrial, commercial and residential applications and have a number of advantages over other types of fuses. In this article, we will take a closer look at the basics of cartridge fuses including their working principle, the different types available and the advantages they offer.

What is a Cartridge Fuse?

The cartridge fuse is a fast type of safety device that is used to protect cables, power lines and equipment against overloads and short circuits in electrical systems. The main function of a cartridge fuse is to protect systems and human life. It is made of ceramic, porcelain or glass.

Cartridge fuses have been produced for over 100 years and there is now an extremely large number in use throughout the world. They perform the vital duty of protecting equipment and electrical networks and ensure that the effects of faults which inevitably occur are limited and that the continuity of supply to consumers is maintained at a high level.

Although they have left their places to miniature circuit breakers in recent years, they can still be used in electrical applications.

If you want to define cartridge fuses with different definitions you can use these:

  • Cylindrical fuse
  • Cylindrical fuse link
  • Cartridge type fuse
  • Glass cartridge fuse
  • Mini cartridge fuse

How Does a Cartridge Fuse Work?

The cartridge fuse works according to the principle of conductor melting and must be replaced with a new one when it is blown.

There is a thin wire or metal alloy strip in the middle and two metal caps are used as contacts when connected in series to an electrical circuit. It is designed to melt at a certain temperature when more current than the nominal amount of electrical current flows through the thin wire. When the wire melts, it becomes an open circuit and no electricity flows.

How does a cartridge fuse work

Cartridge fuses are replaced inside a holder. This is called a cartridge fuse carrier or fuse holder.

Body and Filling Material of a Cartridge Fuse

The outer casing is made of ceramic to withstand pressure and thermal shock and has a high breaking capacity. Contact covers are made of silver-plated copper. Cartridge fuses filled with granular quartz of high chemical purity and grain sizes in the region of 300μm. The grain size is tailored to suit the element thickness and desired performance.

The filling material conducts some of the heat energy away from the fuse element to the body and therefore to obtain consistent performance it is necessary that the packing density of the filling material is maintained constant during production. This factor will significantly affect the behavior at high current levels because a low packing density may allow the arcs to expand more rapidly affecting the column voltage and thus the rate of the current change.

Cartridge fuse and holder

Cartridge fuses have ferrule, blade or screw-type methods of installation.  They are made in capacities of 1 to 1000 amperes for voltages of 125, 250, 600 and 1000 volts. Fuses intended for 600 and 1000-volt service is longer and will not fit the same fuse holders as fuses intended for 250-volt service. Fuses of different ampere capacities are also designed for different sizes of fuse holders. For example, fuses of 1 to 30 amperes fit one size of the holder and fuses with a capacity of 35 to 60 amperes fit a different size holder. Fuses above 60-ampere capacity have knife-blade contacts and are larger in diameter and length as the capacity increases.

Advantages of a Cartridge Fuse

Some benefits of cartridge fuse are:

  • It has a high breaking capacity.
  • There is no risk of reclosing after the trip.
  • It has good selectivity values.
  • Let-through energy performances are high.
  • It has a simple construction and compact size.
  • It is easy to replace.
  • It operates fast.
  • It is a low-cost solution. (Check price)
  • It can be used in low and high temperatures.

Disadvantages of a Cartridge Fuse

Some drawbacks of cartridge fuse are:

  • Risk of a one-phase trip on three-phase lines.
  • Slow recovery time on a trip.
  • Lack of accessories.
  • Capable to perform only once. It needs to be changed after tripping.
  • It is old technology.
  • Most of them should be used with a fuse carrier.
Cartridge fuse 1

Cartridge Fuse Types

There are two types of cartridge fuse available in the market:

1. gL or gG type

Quick cartridge fuses. It is designed for the protection of cables, lines and equipment.

2. aM type

Slow cartridge fuses. They open with a time delay to withstand the starting currents of motors and transformers.

Let’s illustrate the difference between the two as follows:

Let’s say we have 1A gG and aM cylindrical fuse. This fuse should be exposed to a current of 10A. In this case, while the gG-type fuse blows in approx. 1 second, aM type fuse blows in approx. 2 seconds. This is the difference between them. Trip time curves for different current levels are detailed in the manufacturer’s catalogs. You should check them.

Cartridge fuse connection

Cartridge Fuse Applications

Some applications of cartridge-type fuses are:

  • Automation and distribution panels.
  • Protection of measuring instruments.
  • Protection of isolated transformers.
  • Protection of surge arresters.
  • DC and solar applications.
  • Motor starting applications.

Cartridge Fuse Sizes

The sizes of and maximum rated current for cylindrical fuses according to IEC 60269-2 are given below:

Sizes of cartridge fuses and current levels
Cartridge fuse sizes

Color Codes of Cartridge Fuses

Cartridge fuses have different colors such as:

  • Pink: 2 A
  • Brown: 4 A
  • Green: 6 A
  • Red: 10 A
  • Grey: 16 A
  • Blue: 20 A
  • Yellow: 25 A
  • Black: 35 A
  • White: 50 A
  • Copper: 63 A

Continue Reading

Previous: Switch Disconnector: Function, Applications, Advantages
Next: HRC Fuse: Working Principle, Types, Applications, Basics

Related Stories

Arc Flash Relay Essential Guide to Arc Flash Relays and Protection
  • Electric

Essential Guide to Arc Flash Relays and Protection

electricalterminology 2 weeks ago
Dual Function Circuit Interrupter From A to Z: Dual Function Circuit Interrupters
  • Electric

From A to Z: Dual Function Circuit Interrupters

electricalterminology 3 weeks ago
Advantages and Disadvantages of Incandescent Lamps Advantages and Disadvantages of Incandescent Lamps
  • Electric

Advantages and Disadvantages of Incandescent Lamps

electricalterminology 1 month ago
VFD Parts and Functions VFD Parts: A Guide to Their Essential Functions
  • Electric

VFD Parts: A Guide to Their Essential Functions

electricalterminology 1 month ago
Applications of 3 Phase Induction Motors in Industries Applications of 3-Phase Induction Motors in Industries
  • Electric

Applications of 3-Phase Induction Motors in Industries

electricalterminology 1 month ago
Advantages of DC Motors Advantages of DC Motors: Power and Performance
  • Electric

Advantages of DC Motors: Power and Performance

electricalterminology 1 month ago

Posts List

Advantages of Transducers Advantages of Transducers for Optimal Measurement

Advantages of Transducers for Optimal Measurement

Advantages of Infrared Sensors Advantages of Infrared Sensors: Improved Accuracy and More

Advantages of Infrared Sensors: Improved Accuracy and More

VFD Faults Causes Prevention Techniques VFD Faults: Causes and Prevention Techniques

VFD Faults: Causes and Prevention Techniques

Advantages of PCB Advantages of PCB (Printed Circuit Board) in Electronics

Advantages of PCB (Printed Circuit Board) in Electronics

Diode Failures Causes Prevention Tips Diode Failures: Causes & Prevention Tips

Diode Failures: Causes & Prevention Tips

PLC Selection PLC Selection 101: Tips and Tricks for a Successful Choice

PLC Selection 101: Tips and Tricks for a Successful Choice

Categories

  • Electric
  • Electronics
  • Manufacturers & Brands
  • Uncategorized

Pages

  • About Us
  • Affiliate Disclosure
  • Contact

Recent Posts

  • Essential Guide to Arc Flash Relays and Protection
  • From A to Z: Dual Function Circuit Interrupters
  • Advantages of Transducers for Optimal Measurement
  • Advantages of Infrared Sensors: Improved Accuracy and More
  • Advantages and Disadvantages of Incandescent Lamps
Copyright © All rights reserved. | Magnitude by AF themes.