Wirewound Fuse Resistors

Fuse Resistor Applications | Fuse Resistor Color Code

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What is Fuse Resistor?

Fuse Resistors are used to protect circuits from overheating, voltage spikes, and lightning. They are typically made from a semiconductor material such as a resistive wire or a metal strip and are used in series with other components to reduce the risk of short-circuiting. Fuse Resistors have a resistance that decreases as they warm up. When they reach a certain temperature, the Fuse Resistors turn off, preventing the current from flowing through them.

Wirewound Fuse Resistors

Wirewound Fuse Resistors

Wirewound Fuse Resistor

Wirewound Fuse Resistors are designed to function as a normal resistor under normal conditions and as a fuse at high loads. In the WWF series, resistors up to 5W are color-coded with a resistance value of 3 bands as well as a tolerance band. An additional white stripe indicates that the resistor is fusible. For resistors 6W and above, the value is printed on the resistor.

Which resistor is used for the fuse?

Fusible Film Resistors are used in a variety of low power and low surge applications. These include low-level fire safety, surveillance and maintenance, high-end audio/video systems, environmental management systems and controls, and laser printers.

Applications of Fuse Resistor

  1. Overload or surge production
  2. Low-level fire safety
  3. Used in laser printers

Fuse Resistor Color Code

Queen Mao resistors color-coding system is applicable to carbon films, metal films, metal oxide films, fusible and coiled axial wires. This system is used for resistors when the area is large enough to print the last resistance value.

fuse resistor color code

fuse resistor color-code

Currently, Queen Mao’s resistance color-coding system requires automation. The first three bands closest to one end of the resistance are used to determine the resistance. The fourth band indicates the resistance tolerance. Additional information can be obtained from the first band.

Usually, if the additional fifth band is black, the resistor is a wireless resistor. If the fifth additional band is white, the resistor is a fusible resistor. If there is only one black band in the center, the resistance is called the zero-ohm resistance. The colors of the first two bands indicate the numerical value of the resistance. The third band represents the power-off multiplier -10.

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