In industrial installations, fuses serve as protective components in circuits for motors and other electrical machines. They are typically installed at the beginning of electrical systems to provide overall circuit protection.
Fuses are classified and distinguished by their categories and characteristics, including their response time. There are various types of fuses developed with specific features to meet different operational demands.
This text will explore some characteristics, main types, and composition of fuses:
A fuse comprises the following elements:
– Base: Holds the frame of the fuse.
– Fuse holder: Secures the entire assembly of the fuse.
– Protection ring: Safeguards the base thread to prevent contact with the electrical circuit.
– Fuse or fuse link: Component that is replaced in the event of a short circuit.
– Indicator: Part where the fuse’s operation status is visually displayed.
There is also a nomenclature specifically developed to characterize the different types of fuses . It is made using two letters, the first letter is lowercase and the second letter is uppercase, as shown below.
For example: Fuse “gLgG”, Fuse “aR”, see other models on our website: https://fuses.com.br/produtos/
Fuse characteristics
The fuse has some characteristics that are very important when purchasing it. These characteristics are generally described on the fuse body:
– Nominal current: Represents the electrical current for which the fuse is designed to operate safely.
– Breaking current: The value of current that causes the fuse to interrupt the electrical supply in the circuit.
– Characteristic curve: Describes the relationship between the electric current value and the time required for the fuse to interrupt the circuit.
Fusible link : type of metallic material that forms the internal link of the fuse , which melts when necessary.
The fuse characteristic curve is very important information when choosing this item. This is because each fuse reacts differently to a short circuit. The fuse can have ultra-fast, fast, medium, slow or very slow action, also called delayed action.
What types of fuses does THS have in its portfolio? Let’s present some of them:
NH fuse:
NH fuses are used to protect industrial electrical installations from overcurrents and short circuits. They have the “gL/gG” usage category, can have up to six different sizes and have a high breaking current value, being 120KA at 690VAC.
Ultra Fast Fuse
As its name suggests, the ultra-fast type fuse ‘s main characteristic is ultra-fast action in cases of short circuit and overcurrent. It is used to protect rectifier and frequency converter circuits, as the devices used in these circuits are very sensitive to irregularities in the electrical network.
HH fuse
HH type fuses are mainly used in primary cabinets, they also protect transformers, capacitor banks and motors connected to medium voltage.
Cartridge Fuse
The cartridge type fuse has a low purchasing value, its base has the characteristic of adapting to fuses with various nominal current capacities, which puts the installation at risk if this replacement is carried out incorrectly. It also does not follow the guidelines established in the NBR 5410 and NBR 11840 standards.
In addition to these, there are other fuse models that we will talk about in the next posts, as well as more detailed information about each of them. THS has a complete line of fuses . Among them, we have fuses for DC, Photovoltaic, Standard, Semiconductor Fuse , low and medium voltage, subway, underground, etc…
Did you like to know a little more about our products?
Visit our website and see our complete line of Industrial Fuses .
