![]() Look for the markings in the chart above to determine the speed of the fuse. The manufacturer's label should read either fast or slow. The label on the fuse is the manufacturer's label, which will indicate fuse speed. Here is a step-by-step instruction guide to help you determine if a fuse is a fast or slow blow fuse.įirstly, look for a sticker or label around the fuse. How can you tell if the fuse is a fast-blow fuse or a slow-blow fuse? When looking to replace a fuse, you must get the right one. It either suffers and survives the brunt of an overflowing current or burns out. How To Tell If A Fuse Is A Fast Or Slow Blow?įor the most part, a fuse is a sacrificial element in a circuit. The fuse can either be ultra, fast, slow or dual-element. Here is a simple chart to help you determine the type of fuse. Ensure the fuse's I²t value is less than the electric device it will protect during purchase. Semiconductor fuses operate at very high temperatures, providing a limited capability to protect against low overcurrent.Ĭonsequently, ultra-rapid fuses use low melting point alloys. Slow fuses either accommodate or handle surge currents and temporary current overloads.Īn ultra-rapid or semiconductor fuse is a short circuit in diodes, transistors, or thyristors. All slow fuses will, however, open and stop current over time. Short-acting fuses are motor start fuses. Slow-acting fuses or time-delay fuses temporarily allow current overflow through a circuit. This fuse is also a fast blow fuse or a general-purpose fuse. In hindsight, this fuse protects cables from melting or catching fires when an electrical overload occurs. A multi-element provides short current protection, high performance, and a reliable overflow balance.Ī fast-acting fuse or a general application fuse protects sensitive electrical components. These are:ĭual-element fuses or time delay elements are very similar to slow-blow fuses. These fuse speeds also create four different fuse categories. There are four main fuse speeds, and these apply to either fast or slow blow fuses. The time taken when the fuse is first open to catch the overflow current is fuse speed. As a result, a fast-blow fuse has a quicker reaction to counter any electric overflow. Since most home appliances are sensitive to changes in electric currents, fast-acting fuses are the best option. Home appliances or small motors categorically use fast-blow fuses. Moreover, this enables the motor to start without risking the fuse blowing. With this in mind, you need a fuse that can withstand the brunt of the current without blowing. When turning on a motor engine, a high electric current flows through the circuit. They have proven to be a go-to over the years because of their properties. Slow-blow fuses are popular in the motor industry. The first difference between these two types of fuses is their use. Let us look at the differences between the two. Now that you have a proper definition of a fast-blow fuse and a slow-blow fuse. On the other hand, slow blow fuses can withstand high current overflow over a short period without bursting. ![]() These fuse blocks overflow current from shorting out electrical devices and appliances.įast-blow fuses are fast-acting and burst immediately with any hint of an overflowing current. A fast blow fuse is the most common in household appliances. There are two types of fuses available today: fast-blow fuses and slow-blow fuses. As a result, this stops the overflow current from damaging the remaining parts of the circuit. ![]() All fuses have a metal wire or strip that melts or burns out when too much current occurs. They are responsible for the interruption and consequent stopping of overcurrent. Fuses are an integral part of an electric circuit.
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