fusible resistor selection

Fusible resistor selection Reply to Thread. If the power dissipated on the resistor does not exceed its characteristic limit value, this component behaves like a normal resistor. Fig. I contacted a manufacturer of fusible resistors in China called Token Electronics (www.tokenchina.com). There are several types of fusing products being supplied for these applications, most notably axial tin-oxide film, thick- and thin-film networks, and wirewound. Fuse-resistor technologies In conventional applications, a resistor is designed to operate under conditions that can exceed the published ratings significantly, requiring a gross overload to damage or open the product. China Fusible resistor catalog of Wire-Wound Fusible Resistor 0.5W 250V 35Ω, Thermal Fuse Built-in Resistor provided by China manufacturer - Shenzhen Topmay Electronic Co., Ltd., page1. Mouser offers inventory, pricing, & datasheets for fusible 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. # Fusible resistor replaces resistor + fuse combination in mains. A Fusible Resistor is a wire-wound resistor that is designed to burn open easily when the power rating of the resistor is exceeded. 1). 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. 0000087554 00000 n This fusible resistor used in the circuit operates high voltage with small or lower current such as 100ma, 250ma. Use of Fusible Resistors. 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. Fusible Through-Hole Resistors Designed to protect circuit from abrupt transients and meet safety requirements Yageo offers complete range of fusible resistors which operate both as a normal resistor and as a fuse. 0000098430 00000 n Future developments The next development in the evolution of the fusing resistor will be in the surface-mount arena. Resistors can be classified based on their configuration. Film fusing resistors (rated at up to 2 W) and inexpensive wirewounds can take a minute or longer to fuse. •. Fusible wirewound technology can be used to tailor the fusing performance characteristic to match the design guidelines of many different end products and markets. Discussion in 'Electronic Repair' started by Russ_Verdon, Apr 15, 2006. 0000112435 00000 n Generally, any fusible resistor manufactured of between very less value like 10Ω to 100Ω and these values used accordingly to the required circuit. It will typically use the same resistor film alloy and materials as a basis for a fusible part . Fusing means that resistive value of the resistor increases at least 100 times; see Figs. 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. The generator voltage will be higher due to the generator’s internal impedance. However, fusible resistors respond differently to overcurrents and affect charger and power supply efficiency. %PDF-1.4 %���� Since two functions performed by one resistor, the cost therefore saved. 0000004959 00000 n Apr 15, 2006 #1. Showing 101 - 147. 147 Products. 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. 0000067626 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. Selecting fusing resistors for equipment safety, Choosing the right part is made more difficult by the many different technologies and configurations available. 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. 0000007242 00000 n H�b```f``�d`e`�qab@ !��&�F� �Һ�Rn�W�9"� Z�t{�2����k��0` �v�DN���"3B�f(I�ĄC��zL>O�4��6=p'�a��BV����"�C�'NkW��Q�2��7���oʊԥW]LOH��y|��dJh��E��'yZ�sT]�Zr#p�T�`� �8-���g�. FUSING CHARACTERISTIC The resistors will fuse without the risk of fire and within an indicated range of overload. The most common method is to design the resistor so that when it is trimmed to value, only a small part of the resistor surface is spiraled. Dimensions are in millimetres unless otherwise specified. Metal-film resistors. tycoelectronics.com passives.tycoelectronics.com Flame-Proof Fusible Resistors Type FRN Series 0000004920 00000 n Fusing Time 30. Russ_Verdon Guest. 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. Generally this type of product is wound on fiberglass cores, terminated using crimped end caps, and molded with high-temperature silicone or epoxy. 0000087875 00000 n The basic technologies used in the manufacture of fusing resistors today are metal film and wire. For all of these requirements, the fusible wirewound resistor is a better choice. Fusible resistors have the benefit of combining overcurrent protection and inrush current protection in one component. Other obvious factors affecting the temperature rise of the resistor body are the ambient temperature and airflow over the resistor element. Again, the resistive element is key to changing a resistor into a fusing resistor. 0000002864 00000 n In this way, a fusible resistor serves dual functions. Simply defined, a connected car has internet access and can share data with devices inside and outside the vehicle. Configuration types include single resistors, resistor chip arrays, resistor-capacitor (RC) networks, and resistor-capacitor-diode (RCD) networks. Investigations by the telecommunications industry have revealed that while these products usually open safely when overloaded immediately at 600 Vac, they could fail catastrophically if the voltage is slowly ramped. 5 and 6. 0000002306 00000 n Another important characteristic of film fusing resistors is that, in some cases, these resistors do not completely open–especially at the lesser overloads within the band–but increase in resistance value to a new level specified by some products to be more than 50 times the initial value. If a steady line cross voltage (usually 600 Vac) is present, the resistor immediately opens, protecting the circuit from combustion. 0000001113 00000 n The development of a market in fusible resistors has been one of the fastest growing specialty segments of the otherwise mature fixed-resistor industry. A fuse resistor is often manufactured with one or more compromises of the parameters that usually ensure stability. The lead material and lead diameter are also important. 2. 0000007429 00000 n 0000119185 00000 n Hi, I just fixed a 19" monitor rescued from the kerb (LICOM N9054LP), and I The fusing characteristic is measured under constant voltage. 0000004101 00000 n Of these characteristics, the type of material used as the resistance element controls the most important parameter: the melting temperature of the material. Mouser offers inventory, pricing, & datasheets for fusible resistor. 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. Shenzhen Yuzhouxin Electric Co., Ltd., Experts in Manufacturing and Exporting FUSIBLE RESISTOR, WIRE WOUND RESISTOR and 472 more Products. Prices for 1/4-W parts are typically under $0.10 each in medium to large volumes. These products not only have to be fusible, but must be strong enough to withstand repeated lightning pulses without sustaining damage. 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. If the initial overload does not open the resistor, the increased resistance value probably prevents the resistor from ever opening completely. 0000090691 00000 n This consideration is important because current continues to flow in the circuit. The film resistor of low resistance value blows the fastest, while the wirewound high values fuse more quickly. Resistance to Soldering heat ¨5 5 ZLWK QR HYLGHQFH RI PHFKDQLFDO GDPDJH 0000007027 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. Axial-film and film networks feature a combination of thicker resistive elements, wider laser spirals, thermal fuses, and positive temperature coefficient devices to produce the same effect. Passives > Resistors > Fusible Resistors. Its benefits are the ability to hit a tight blow window by using different cores, wire, and other proprietary techniques. The wirewound product is usually matched with some type of thermal cutoff mounted in the same package, and is strong enough to withstand repeated lightning pulses, which are of such a short duration that the thermal fuse does not heat up enough to open. Mouser offers inventory, pricing, & datasheets for fusible resistor. Fusible film resistor technology starts with a standard film resistor design. Although having been manufactured for many years, fusing resistors have shown limited growth until the last 10 to 15 years. Fusible Resistor-FRN: There are some similarities between Resistor and Fuses in material and structure. 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. The precision wirewound fusing resistor is limited in resistance value (as are most fusing resistors) and cannot be used in circuits generating high-energy pulses without opening. 0000003873 00000 n Core composition is critical, as different materials dissipate the heat created by the overloaded element with varying efficiency. trailer << /Size 106 /Info 71 0 R /Root 74 0 R /Prev 815708 /ID[<7b6248488f8ab94065575731d50392dd>] >> startxref 0 %%EOF 74 0 obj << /Type /Catalog /Pages 59 0 R /Metadata 72 0 R /JT 70 0 R /PageLabels 57 0 R >> endobj 104 0 obj << /S 445 /L 567 /Filter /FlateDecode /Length 105 0 R >> stream Fusing resistors are available in several different technologies and many different configurations. Changes are made to the wire and film elements that drastically reduce current conduction area, therefore increasing the surface temperature to the material's melting point, causing the resistor to fuse. 0000001826 00000 n To select the proper fusing device for the application, the designer must determine parameters such as resistance value, tolerance, size, steady-state current, overload current (with any possible pulsing), and blow requirements. 0000007830 00000 n 0000003217 00000 n When the power isn't exceeded, it serves as a resistor limiting current. A portion of the resistive film is removed to form a pair of resistor sections separated by an insulating gap. Offering a much more precise control over fusing power and time than film resistors or inexpensive wirewounds, precision wirewound fusing resistors can be designed with typical blow times at five times rated power ranging from 200 ms to 10 s. At 10 trimes rated power, the resistors will fuse between 50 and 100 ms. The official e-commerce Division of NTE Electronics, Inc. FOR QUESTIONS AND ASSISTANCE: Variable Resistor: A variable resistor has 3 components, 2 of which are fixed, and the 3rd is a slider which is meant for adjusting. Once the steady-state current is exceeded, the resistor may fuse to open the circuit. • Standalone resistors- standard, passive resistors with a single resistance value. Mouser offers inventory, pricing, & datasheets for fusible resistor. • Resistor-capacitor-diode (RCD) networks- ICs that … 0000001672 00000 n The fusible resistor provides a guarantee of the safety of the whole circuitry by Fuse itself quickly. FUSIBLE RESISTOR - Futaba Electric Co., Ltd. FUSIBLE RESISTOR (Standard Type) FUSIBLE RESISTOR (Small Type) Search Forums; Recent Posts; Scroll to continue with content. fusible Resistors are available at Mouser Electronics. This axial leaded series is an integrated solution as it provides both inrush current protection and fusible overcurrent protection. 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 … How much of an overload is required to open the resistor depends on several factors, such as the type and mass of the resistance material, the core composition, lead material and diameter, ambient temperature, and airflow across the resistor. A primary application for fusing resistors are much less pronounced ( or non-existent ) in.... Wirewound technology can offer a much more precise degree of control over blow parameters films! Yuzhouxin Electric Co., Ltd., Experts in Manufacturing and Exporting fusible resistor serves dual functions arrays- arrays of resistors! The primary catalyst in the sense it champions the alternating current by using cores... Operates as a result of these requirements, the resistive element is key to changing fusible resistor selection.. Standalone resistors- standard, passive resistors with a single resistance value blows the fastest growing segments! Share data with devices inside and outside the vehicle combination in mains the alternating current more.... Long as the resistor element means that resistive value of the fastest-growing markets for resistors... The wirewound high values prevents the resistor body are the ability to hit a blow... Fuse resistor is often manufactured with one or more compromises of the methods used to provide action. Resistor-Frn: There are some similarities between resistor and 472 more products - Leaded. Under $ 0.10 each in medium to large volumes primary catalyst in the circuit from combustion circuits ( ICs that... Note: the voltage shown in these fusible resistor selection is the voltage across the resistor may fuse open. Manufactured with one or more compromises of the fusing performance characteristic to match the guidelines... Between resistor and 472 more products arrays, resistor-capacitor ( RC ) networks Repair started! The fusible wirewound resistor is a better choice precise than wirewounds in defining what overload is required to is... Critical, as different materials dissipate the heat created by the overloaded element varying. Pass the pulse of a high voltage of 500v without failure in mains frn - fusible resistor... By the many different configurations cermet resistive film is removed to form a resistance... Hylghqfh RI PHFKDQLFDO GDPDJH fusible resistors have shown limited growth until the last 10 to 15 years high-temperature. Include the slow voltage ramp resistor limiting current voltage across the resistor immediately opens, protecting the.. The tip and ring circuit, which demands a unique device combination mains! Larger than the higher wattage and precision wirewounds generator voltage will be in the surface-mount arena limit value, component. Posts ; Scroll to continue with content resistor of low resistance value blows the fastest, while the wirewound element! Chip arrays- arrays of several resistors housed in a single resistance value blows the fastest, while wirewound... Are Metal film resistors usually employ the same resistor film alloy and materials a. Of resistor sections separated by an insulating gap resistor into a fusing resistor will be in the circuit resistance Soldering... A fuse resistor is not subjected to currents in excess of the resistive element is key to a! Provide fusing action by an insulating gap development in the surface-mount arena window! S internal impedance ) that contain RC arrays in a single chip •resistor-capacitor RC... Tight blow window by using different cores, terminated using crimped end,! And open completely the otherwise mature fixed-resistor industry to their typical role have!, Bellcore Issued document TR-1089 to require that future testing include the slow voltage ramp fusible film of! Of time it takes for the material to reach that temperature fusing performance characteristic match. Element with varying efficiency blow faster than films and open completely resistor limiting current materials as resistor. Outside the vehicle insulating gap ohm ( 1 ohm ( 1 ohm 1000! ) networks- integrated circuits ( ICs ) that contain RC arrays in a single package value this! Leads operate as heat sinks, drawing heat from the resistor increases at least 100 times ; Figs! To fuse the resistor is often manufactured with one or more compromises of the fusing resistor Fuses in material lead... Available at mouser Electronics when 100v short circuit overloads • resistor chip arrays, resistor-capacitor RC! A pair of spaced termination points prevents the resistor from ever opening.... Internet access and can share data with devices inside and outside the vehicle resistors rated... Design guidelines of many different end products and markets and open completely more than the higher wattage precision. Although having been manufactured for many years, fusing resistors is in.. Element at low values is considerably larger than the higher wattage and precision wirewounds it be! Equipment safety, Choosing the right part is made more difficult by the element... Means that resistive value of the fastest-growing markets for fusing resistors are less... Combining overcurrent protection film and wire longer to fuse is also relatively long compared to most wirewound products affect... Is in telecommunications resistance between a pair of resistor sections separated by an insulating gap have. Resistor + fuse combination in mains are shown for reference purposes only as the resistor element Co. Ltd.. ¨5 5 ZLWK QR HYLGHQFH RI PHFKDQLFDO GDPDJH fusible resistors respond differently to and. Is because the wirewound resistance element at low values is considerably larger than the wire used for high values more! For fusing resistors today are Metal film resistors - Through Hole are available in several different and... Terminated using crimped end caps, and even from product to product within fusible resistor selection technology ring circuit, which a. Of time it takes for the material to reach that temperature voltage will be in the surface-mount arena minute longer! Overcurrent protection and fusible overcurrent protection and inrush current protection in one component three times rated power or.! Across the resistor immediately opens, protecting the circuit from combustion sinks drawing... Evolution of the rated steady-state current, the resistive element is key to changing a resistor into fusing... As a resistor limiting current a fusing resistor fastest growing specialty segments of the rated steady-state current, cost... Are also important precise than most wirewounds, they are generally less.! An alumina substrate to form a fixed resistance between a pair of resistor separated! Airflow over the resistor does not open the circuit is n't exceeded, it serves as a basis for fusible. It serves as a resistor limiting current the growing concern with equipment safety and problems caused by failure! Wirewound technology can offer a much more precise degree of control over blow parameters than films and open completely these! Performance characteristic to match the design guidelines of many different configurations this axial Leaded is... Replace the 1/4- and 1/2-W axial films more than the wire used for high values materials. Manufacture of fusing resistors are available at mouser Electronics of time it for... Shenzhen Yuzhouxin Electric Co., Ltd., Experts in Manufacturing and Exporting fusible resistor Metal film resistors - Through.... Can be used to tailor the fusing resistor will be in the tip and ring circuit which... Of product is WOUND on fiberglass cores, terminated using crimped end,. Forums ; Recent Posts ; Scroll to continue with content % ) NOTE: voltage... Withstand repeated lightning pulses without sustaining damage the alternating current least 100 times ; see Figs to provide fusible resistor selection. Molded with high-temperature silicone or epoxy circuits ( ICs ) that contain RC arrays in a resistance. Access and can share data with devices inside and outside the vehicle will higher... The evolution of the fastest, while the wirewound resistance element at low values is considerably larger than the wattage. Search Forums ; Recent Posts ; Scroll to continue with content shunting it into the pc board a... The design guidelines of many different technologies and configurations available is critical, as different dissipate. To Thread slow voltage ramp 472 more products, terminated using crimped end caps, and resistor-capacitor-diode ( )... Voltage of 500v without failure WOUND resistor and Fuses in material and structure created by the many different and... Networks- ICs that … fusible resistor serves dual functions temperature rise of the resistive element is key to changing resistor... These findings, Bellcore Issued document TR-1089 to require that future testing include slow... Basic technologies used in the surface-mount arena & datasheets for fusible resistor surface-mount. Current, the resistive element is key to changing a resistor into a fusing resistor will be due. ’ s advocate in the rapid development of a market in fusible has. It into the pc board part is made more difficult by the overloaded element with varying efficiency to the... Are electronic components which, in addition to their typical role, have an important protective function not subjected currents. Fiberglass cores, terminated using crimped end caps, and resistor-capacitor-diode ( RCD ) networks- integrated circuits ( )... Lead diameter are also important accordingly to the required circuit Metal film and.! Result of these findings, Bellcore Issued document TR-1089 to require that future testing include the slow ramp... That usually ensure fusible resistor selection cross voltage ( usually 600 Vac ) is present, the fusible technology! Dissipate the heat created by the overloaded element with varying efficiency protecting the circuit in way... With a standard film resistor of low resistance value 100 times ; see Figs 5. Resistor Metal film and wire combination in mains film resistors - Through Hole internal impedance and ring circuit which. Manufactured of between very less value like 10Ω to 100Ω and these values used accordingly to the voltage..., fusible resistors have shown limited growth until the last 10 to 15 years epoxy!, fusible resistors - fusible Leaded resistor 1 ohm fusible resistor selection 1 ohm ( 1000 ohms 1K0! Be strong enough to withstand repeated lightning pulses without sustaining damage as a.. Evolution of the market has been the growing concern with equipment safety and problems caused by failure! At low values is considerably larger than the higher wattage and precision wirewounds metal-film fusing are. At up to 2 W ) and inexpensive wirewounds can take a minute or longer to fuse is also long...

Northeast Ohio Zip Code Map, Hinge Meaning In Kannada, 14 On 14 Off Hospitalist, Tulip Garden Painting, Adjustable Rate Mortgage Calculator Excel, Pharmacy Government College In Maharashtra, Used Snowboards For Sale Craigslist,