Each parameter will help define which technology will function correctly in the circuit. Some of the methods used to provide fusing action are similar. One of the fastest-growing markets for fusing resistors is in telecommunications. If the power dissipated on the resistor does not exceed its characteristic limit value, this component behaves like a normal resistor. The official e-commerce Division of NTE Electronics, Inc. FOR QUESTIONS AND ASSISTANCE: This application note aims to simplify the processes of value selection and design verification, and should be read in conjunction with the full product datasheet. FWxxA Series Fusible Power Resistors Fusing Performance Temperature Rise Power Derating Curve Pulse Performance 1.2/50 μs Peak Voltage Limit (10 pulses at 10 sec. 0000004920 00000 n The lead material and lead diameter are also important. The development of a market in fusible resistors has been one of the fastest growing specialty segments of the otherwise mature fixed-resistor industry. (line) input applications. This axial leaded series is an integrated solution as it provides both inrush current protection and fusible overcurrent protection. Fusing within 1 s can require an overload at 60 times rated power or more, and the minimum power required to fuse (15 to 20 times rated power) can take 30 s or longer to cause fusing. Back Filter Options. Russ_Verdon Guest. Wirewound technology offers the designer much more control over fusing power and time, although some less expensive wirewound fusing resistors offer characteristics quite similar to film products. Fusible resistors. Future developments The next development in the evolution of the fusing resistor will be in the surface-mount arena. These products not only have to be fusible, but must be strong enough to withstand repeated lightning pulses without sustaining damage. The cost may be justified due to the speed and precision of the blow time, as this product is usually applied in applications where it is triggering a missile circuit or offering fast overload protection for semiconductors and other components worth hundreds of dollars. 0000001650 00000 n 0000001672 00000 n Fig. Typical blow times with five times rated power range from 50 ms to 10 s, and with 10 times rated power from 10 to 200 ms. Generally, this type of product costs several dollars each or more, depending on the degree of manufacturing difficulty and testing required. Although a variable resistor isn’t common in electrical … Mouser offers inventory, pricing, & datasheets for fusible resistor. Film fusing resistors typically offer a wide fusing band, often beginning at 15 times rated power or more, and stretching out to 40 to 60 times rated power. Variable Resistor: A variable resistor has 3 components, 2 of which are fixed, and the 3rd is a slider which is meant for adjusting. 0000007642 00000 n 0000007027 00000 n •. 0000090552 00000 n 1. The less expensive wirewounds blow faster than films and open completely. Product CRP CRF RF BWF RXG3 RXB RXB1 RXB2 Picture Type CRP252-1, CRP254-1 and CRP257-1 … As long as the resistor is not subjected to currents in excess of the rated steady-state current, the product operates as a resistor. Metal Film Resistors, Axial, Special Purpose, Fusible, Flameproof FEATURES • Special filming and coating processes • Fusible - circuit protection in case of other component failure • Flameproof - meets EIA RS-325, will not flame when overloaded • Tape and reel packaging is standard • Material categorization: for … Generally this type of product is wound on fiberglass cores, terminated using crimped end caps, and molded with high-temperature silicone or epoxy. The higher-resistance values typically blow from 4 times rated power in 60 to 100 s to 20 times rated power in 5 to 60 s. The lower values may take 5 to 10 times rated power to blow within 100 s or 20 times rated power to blow within 20 s (saee Fig. As adherence to safety agency requirements such as UL, CSA, and TUV are adopted by more manufacturers and their customers, the growth of products designed to open a circuit should continue. Normally considered a defect, the short spiral causes an abnormal, concentrated hot spot, which brings the temperature of the film to the melting point quickly, negating the usual uniform heat dissipation pattern of the core, and canceling the heat-sinking effect of one of the leads. When the circuit works normally, it acts as a resistor; when the circuit fails, when the current flowing through the fuse resistor reaches a certain level, the fuse resistor quickly blows, acting as an over current fuse. intervals, ΔR < 5 %) NOTE: The voltage shown in these curves is the voltage across the resistor. 0000098636 00000 n Selecting fusing resistors for equipment safety Choosing the right part is made more difficult by the many different technologies and configurations available BY JIM McGONNELL IRC, Inc., Boone, NC The development of a market in fusible resistors has been one of the fastest growing specialty segments of the otherwise mature fixed-resistor industry. Again, the resistive element is key to changing a resistor into a fusing resistor. 2 Watt Fusible Resistors from NTEPartsDirect.com. Mouser offers inventory, pricing, & datasheets for fusible resistor. FUSIBLE RESISTOR - Futaba Electric Co., Ltd. FUSIBLE RESISTOR (Standard Type) FUSIBLE RESISTOR (Small Type) Fusible Resistor contain both functions, as being Resistor in normal condition and changed into fuse while abnormal Current comes in to protect machine and equipment. • Resistor-capacitor-diode (RCD) networks- ICs that … Fusible resistors have the benefit of combining overcurrent protection and inrush current protection in one component. Metal-film resistors. As a result, most of the electronic equipment manufactured today has been designed with the ability to deenergize before a fire or other calamity can occur. Its benefits are the ability to hit a tight blow window by using different cores, wire, and other proprietary techniques. Fusing resistors are available in several different technologies and many different configurations. In this way, a fusible resistor serves dual functions. Axial leads operate as heat sinks, drawing heat from the resistor body and shunting it into the pc board. Additional Feature FLAME PROOF PRECISION. One characteristic that is different is the time required to fuse relative to resistance value–in wirewound parts this characteristic is reversed compared to that of film resistors. A handful of manufacturers already have introduced products ranging from a surface-mount fusible MELF (an axial film without the leads) to thick-film flat chips. fusible resistor are available at Mouser Electronics. A fusible resistor can pass the pulse of a high voltage of 500v without failure. 0000002306 00000 n Fusing Time 30. MELF Fusible Resistor-MEFRN: There are some similarities between Resistor and Fuses in material and structure. Fusible Resistors FUSIBLE RESISTOR. Prices for 1/4-W parts are typically under $0.10 each in medium to large volumes. Fusible resistor series is a new type of component, it is a compound function resistor with the dual function of resistor and fuse. By winding to the resistance value with much thinner diameter wire on ceramic substrates using welded terminations and encapsulation in epoxy or ceramic shells, resistors can be designed to consistently blow at a predetermined current within a 50-ms window (see graphs). The fusing characteristic is measured under constant voltage. 0000007242 00000 n Wirewound technology also offers a greater selection of products, ranging from inexpensive resistors that operate and cost in the same range as films, to precision fast-acting fuse resistors. 0000038135 00000 n It will typically use the same resistor film alloy and materials as a basis for a fusible part . 0000098430 00000 n 0000067626 00000 n Terminal strength No evidence of mechanical damage. Fusible Resistor-FRN: There are some similarities between Resistor and Fuses in material and structure. Since two functions performed by one resistor, the cost therefore saved. 0000003217 00000 n Fuse & Fusible Resistor from Changzhou Southern Electronic Element Factory Co., Ltd.. Search High Quality Fuse & Fusible Resistor Manufacturing and Exporting supplier on Alibaba.com. These products will undoubtedly replace the 1/4- and 1/2-W axial films more than the higher wattage and precision wirewounds. Fusible, Resistors, Fixed manufactured by Vishay, a global leader for semiconductors and passive electronic components. This fusible resistor used in the circuit operates high voltage with small or lower current such as 100ma, 250ma. The fusible resistor provides a guarantee of the safety of the whole circuitry by Fuse itself quickly. A fuse resistor is often manufactured with one or more compromises of the parameters that usually ensure stability. 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