![]() Normally, the carbon black makes the mixture conductive. They contain carbon black particles embedded in organic polymers. Like their name suggests, these fuses are self-resetting. Some of these types are also used in other high-power circuits. They come in ‘blade’ form (a transparent plastic envelope with flat contacts) and are colour coded according to rated current. These fuses are specifically designed for automotive systems that run up to 32V and occasionally 42V. SMD variants of cartridge fuses also exist for direct PCB mounting. This is to prevent arcing between the two ends of the fuse after it has blown. Fuses for high voltage applications are filled with sand or oil. ![]() Some variants of this fuse are encased in ceramic to withstand high temperatures. Fast blow fuses react instantly to current spikes. Slow blow fuses have a larger element that can handle overcurrent for a relatively short period of time and are unaffected by spikes in the appliance. There are many variants of this design, including slow blow fuse and fast blow fuse. Since the glass envelope is clear, it is easy to visually determine if the fuse is blown. The fuse is placed in an appropriate holder. The fuse element is encased in a glass envelope that is terminated by metal caps. We will discuss each fuse in brief in our article. The below block diagram illustrates the different types of the fuse under each category. However, the IEC fuse is slightly different:įuses can be divided into two major categories, AC fuses, and DC fuses. The standard IEEE/ANSI symbols for the fuse is as follows: The element must not oxidize or corrode over time. The thickness and length of the resistive element determine the rated current.įuse elements are made of zinc, copper, silver, aluminium or other alloys to provide predictable trip currents. The resistive element melts and the circuit is interrupted. However, if the current draw exceeds the rated current of the fuse, the melting point is quickly reached. For normal currents, this temperature increase is not enough to melt the filament. The temperature of the element thus increases. When a current passes through this element, a small voltage drop (small enough so the circuit downstream won’t be affected) is created across the element, and some power is dissipated as heat. The simplest kind of fuse consists of a resistive element, selected carefully for its melting point. The primary job of a fuse is to break the circuit if a current higher than desired is drawn by the circuit, thus preventing damage due to short circuits. In this article, we will learn how a fuse works and about the different types of the fuse. Fuses are found in every circuit in one form or another in various shapes, sizes, and ratings. A fuse is probably the simplest electrical device, but its function is critical in protecting electrical circuits from damage.
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