Cartridge fuses are safety devices designed to prevent overloads and short circuits by interrupting the power supply of higher voltages. They are supplied with dual contact points, one on each side. They are usually cylindrical and general-purpose and popular fuse types. A cartridge fuse comprises built-in resistors that trigger overload protection tasks. Furthermore, they are the most inexpensive, high-speed, and easy-to-replace fuses due to their cylindrical design. In addition, they come in various sizes and ratings with excellent compatibility features.
Why Use Cartridge Fuses?
A cartridge is a must-have safety device that offer various benefits, such as:
- These fuses provide a considerably cheaper and more handy way to protect electrical devices from overloads and short circuits, preventing damage.
- Furthermore, it is worth using due to its incredibly safe nature, as they do not produce arcs, flames, or gas during burnout or break the circuit.
How Do They Work?
These fuses are comprised of thin wires called resistors that melt during excessive current flow in the circuit. When the wire melts, it breaks the circuits and prevents the current flow. This phenomenon is referred to as "blowing out." It is relatively simple to replace the fuse to complete the circuit and restore the power supply.
Materials and Current Ratings of Cartridge Fuses
Cartridge fuses are made from durable materials, like ceramic, glass, or porcelain with internal resistor wires constructed from silver, copper, zinc, or aluminium.
When selecting fuses for your required application, it is crucial to consider the standard amperages available. It would be best to select a fuse with relatively higher ratings than the device it is used to protect. This will prevent the device from blowing even if a slight increase in power occurs.
Types of Cartridge Fuses
Basically, there are two types of cartridge fuses.
- Ferrule-type fuses: These fuses feature a cylindrical metallic cap on either end that resembles the fuses integrated into the plug ends of holiday lights.
- The knife-blade type fuse: They have a similar shape to the ferrule type but consist of a flat metallic blade on each side. They are ideal for protecting circuits over 60 amps up to 600 amps.
- Fuse Markings and Speed Codes: Fuse markings and speed codes given on cartridge fuses are crucial when choosing the right fuse in terms of speed and protection of electrical equipment. The following are some of the familiar markings:
- H = High Breaking Capacity
- L = Low Breaking Capacity
- FF = Very Fast Acting (Flink Flink)
- TT = Very Slow Acting (Trage Trage)
- F = Fast Acting (Flink)
- T = Slow Acting (Trage)
- M = Medium Acting (Mitteltrage)
What are the Typical Applications of Cartridge Fuses?
The bespoke fuses are ideal for high-voltage circuits such as dryers and electric ranges. They are also widely employed to protect electrical devices where high voltage ratings and currents are needed, like:
- Motors
- Air-Conditions
- Refrigerators
- Pumps
- Industries
- Commercial, and
- Home Distribution Panels.
