17721020 - 25W 20 Ohm Non-Inductive Aluminum Housed Resistor

Restore Your Machine with Quality Components

When a welding machine goes down, production stops. Often, the culprit is a small, overlooked electronic component like a power resistor. The 25W 20 Ohm Non-Inductive Resistor is a premium replacement part designed to get your equipment back up and running. Built to withstand the rigors of industrial use, this resistor features a tough aluminum housing that screws directly onto a chassis or heat sink. This design maximizes heat transfer, preventing the overheating that causes lesser components to fail.

Why Non-Inductive Matters

In the world of welding electronics—especially with TIG and Plasma cutters—high-frequency (HF) noise is a constant factor. Standard resistors can inadvertently act as coils, introducing inductance that messes with sensitive control signals or HF start mechanisms. This resistor is Non-Inductive (NI), meaning it is wound in a specific way to cancel out magnetic fields. This ensures that it behaves purely as a resistor, even when subjected to the rapid switching frequencies of modern inverter welders. Using the correct non-inductive part is crucial for maintaining the stability of your arc and the longevity of your machine's control boards.

Technical Specifications

Rated for 25 Watts and providing 20 Ohms of resistance, this unit is built for power. The 1% tolerance ensures that the electrical characteristics of your machine remain within factory specifications after the repair. Unlike cheap ceramic resistors that can crack under thermal stress, the aluminum housing provides physical protection and superior thermal management. Whether you are a professional technician or a DIYer fixing your shop welder, using high-quality components like this ensures the repair lasts.

Installation Tips

When installing this chassis-mount resistor, ensure the mounting surface is clean and flat. For optimal performance, it is recommended to apply a thin layer of thermal compound (heat sink grease) between the bottom of the resistor and the chassis. This maximizes heat transfer and ensures the resistor can handle its full rated power without overheating.