TRW FRWA21 Wirewound Power Resistor 750Ω 40W

The TRW FRWA21 is a robust wirewound power resistor designed for high-power dissipation in industrial and electronic applications. Featuring a resistance of 750 ohms and a power rating of 40 watts, this chassis-mount resistor is encased in an aluminum housing for efficient heat dissipation and durability. It is commonly used in power supplies, motor controls, load banks, and braking systems where reliable energy absorption is critical. Key benefits include excellent thermal stability, high overload capacity, and resistance to vibration and shock, making it suitable for harsh environments. Compared to similar products like those from Vishay or Ohmite, the FRWA21 offers superior heat sinking due to its finned design, reducing the need for additional cooling. However, it may have a higher cost for custom values and requires proper mounting for optimal performance. Drawbacks include potential inductance in high-frequency applications and the need for derating at elevated temperatures. This unit appears used based on visual inspection, with minor wear but intact terminals and labeling. Ideal for OEM replacements or prototyping, it provides precise resistance with low temperature coefficients for consistent operation.