PWR220T-20-1200F

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Through Hole Resistors represent a common resistor component of circuit boards with a variety of applications. The specific component, PWR220T-20-1200F, is a high-power series Through Hole resistor. Below, we explain the application field and working principle of this component.

Application Field

The PWR220T-20-1200F was developed primarily for current-limiting applications in a variety of circuits. The component is capable of handling currents as high as 20 Amp, making it well-suited for use with vast power supplies. Additionally, this component is designed to carry high power necessary for circuits operating at high voltages.

The PWR220T-20-1200F is particularly well-suited for various audio/video applications, either as a current-limiting device, or as a load resistor. Some other applications of this component include suppression of in-line noise from power supplies and surge protection of connected equipment.

Working Principle

This Through Hole Resistor is based on a simple voltage divider principle. In this voltage divider, the total voltage drop across the resistor is equal to the input voltage, while the power dissipated in the resistor is equal to the input current multiplied by the resistor resistance value. The resistor shifts the voltage potential from the input to a lower value.

The PWR220T-20-1200F component consists of two part\'s, a ceramic body and a metal alloy plate which helps dissipate heat in order to prevent overheating. The ceramic body is insulated from the voltage by a dielectric layer, to protect both the resistor and sensitive components, such as delicate integrated circuits. This ceramic body, along with the metal alloy plate, contains the current, allowing it to not exceed the maximum power rating.

When the current exceeds the maximum rating, the component begins to heat up. As the resistor continues to heat up, the thermal protection feature of the Metal Film Resistor kicks in, reducing current to a safe level. This prevents the circuit from burning out or suffering other damages. The resulting safe voltage level of the resistor is then diverted to a ground connection or other safe location.

Conclusion

The PWR220T-20-1200F is a Through Hole Resistor, principally designed for current-limiting applications in various types of circuits. This component is capable of carrying high power necessary for circuits operating at high voltages, and is suitable for use with both audio/video applications and surge protection of connected equipment. The component works on the simple voltage divider principle and contains a ceramic body with metal alloy plates, which help dissipate heat to prevent overheating. If the current exceeds the maximum rating, the resistor will activate its thermal protection feature, reducing current to a safe level.

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