Enameled Wirewound Resistors: What Are They Used For?

Wirewound resistors are among the most reliable and versatile solutions for electrical energy dissipation in power electronics.

Thanks to their construction — a resistive wire wound on a ceramic tube and coated with a vitreous enamel layer — they ensure high mechanical strength, thermal stability, and precision.

But why are these resistors used in virtually every industrial and electronic sector? Let’s find out.

Why Choose an Enamelled Wirewound Resistor

Enamelled wirewound resistors on ceramic supports are designed to handle high currents and power levels safely and efficiently.

The resistive wire (usually made of nickel-chromium or constantan alloy) is wound on a tubular ceramic core and then coated with enamel, improving resistance to heat, humidity, and chemical agents.

This design offers:

  • a wide range of resistance values and power ratings;
  • excellent heat dissipation capability;
  • long-term stability;
  • strong mechanical resistance and reliability, even in harsh environments.

In short, enamelled wirewound resistors combine stability and robustness, making them ideal for applications that require continuous operation and electrical safety.

Applications of Enamelled Wirewound Resistors

Thanks to their versatility, enamelled wirewound resistors are used in a wide variety of industrial and technological fields. Main applications include:

  • inrush current limitation in capacitor banks, motors, and transformers;
  • charge and discharge resistors for storage systems and power circuits;
  • test benches requiring controlled energy dissipation;
  • power supply and conversion systems (UPS, inverters, DC/DC and AC/DC converters).

The Fairfild Resistor Families

Fairfild offers a complete range of wirewound resistors designed to meet a wide variety of design and power requirements. The lineup includes eight families, divided into four cemented series (RC, RS, RCA, RSA) and four enameled series (RCPO, RSPO, RCE, RSE), covering a broad spectrum of resistance values and nominal power ratings. Each series is engineered to deliver long-term reliability, excellent resistance to thermal shock, and full compliance with international industrial standards.

Choosing Fairfild’s enameled wirewound resistors means relying on a company with over thirty years of experience in the design and production of power resistors and industrial components. A wide product range and the possibility of custom-made solutions allow Fairfild to meet any technical requirement — from prototype development to complex industrial systems.

Fairfild’s enameled wirewound resistors offer high performance, precision, and durability across all application sectors. Visit www.fairfild.com to explore all the series, and find the most suitable solution for your design needs. Contact us today for a personalized technical consultation: our experts will help you select the most effective and high-performing resistor for your application.