What Is a Fusible Resistor?

A resistor is a type of passive two-terminal electrical component, commonly implemented within an electronic circuit for the means of providing electrical resistance. Resistors can serve many roles ranging from the reduction of current flow to the termination of transmission lines, and various types may be used for particular needs or requirements. The fusible resistor, commonly known as a fuse resistor, is one that may be used for the protection of a circuit. Capable of guarding a system against current load jumps, such resistors are regularly implemented in series with the input main power supply of a device or assembly.

The fuse resistor is most commonly used for circuit applications that exhibit high sensitivity and low power requirements. Additionally, such components may also be present in systems where overload and surge handling requirements are not too rigorous. Circuit faults may occur due to various reasons, often being the result of a faulty component or a short circuit condition. When a surge occurs, an excess amount of voltage will quickly travel through the circuit, posing the risk of creating heat, damage, and flames. As such conditions can destroy a system or pose fire risks to the surrounding area, having protection is paramount.

While the fuse resistor may be used as a safety fuse, they should not be confused with standard fuses that are similarly implemented within electronic circuits. With a standard glass tube fuse, high surge current load devices can be protected with ease. During an overload condition, the fuse will quickly break down, immediately stopping the flow of electricity until the sacrificial device is replaced. Generally, fuses are produced with copper or silver elements, featuring melting temperatures that range between 962 and 1083 degrees Celsius.

The fuse resistor, on the other hand, is best for systems exhibiting high voltage and lower currents, featuring a melting point of around 1400 degrees Celsius. While capable of handling certain high voltage conditions, such components must be able to stop current without producing any flames. The biggest advantage of the fuse resistor is that it is capable of limiting inrush current with its resistive element. With a resistance value of 10 Ω, a fuse resistor is well capable of serving as the main overcurrent protection element for a power supply or charger. Fuse resistors also can save space as they are combined with a thermistor, creating a more compact assembly as compared to a separate fuse and thermistor.

As fuses typically cater to much more rigorous standards, they can act as a powerful overcurrent protection device. Despite this, the compact assembly of the fuse resistor makes it an optimal space-saving device for low wattage power supplies and chargers. They may also be used for applications where overcurrent protection is provided for wattage upwards of 15 W. When procuring fuse resistors, the most common variations seen across devices and applications are wirewound resistors.

If you find yourself in need of resistors, current protection devices, and other various components, look no further than Accelerating RFQs. As a leading distributor of aircraft parts, we can help customers procure all the items that they need with rapid lead-times and competitive prices. Take the time to explore our vast part and manufacturer catalogs, and our team of industry experts is always readily on standby 24/7x365 to assist customers through the purchasing process as necessary. Fully dedicated to quality assurance and export compliance initiatives, Accelerating RFQs conducts operations with AS9120B, ISO 9001:2015, and FAA AC 00-56B certification and accreditation. Give our team members a call or email at your earliest convenience and see how we can help you fulfill all your operational requirements quickly and easily.


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