What is FIW wire?

Fully insulated wire (FIW) is a type of wire that has multiple layers of insulation to prevent electrical shocks or short circuits. It is often used for building switching transformers that require high voltage and high FIW has some advantages over triple insulated wire (TIW), such as lower cost, smaller size, better windability and solderability FIW is also approved by various safety standards

According to the thickness of the insulating paint film, there are seven grades of FIW3 to FIW9, among which the thickest FIW9 has the strongest pressure resistance. Tianjin Ruiyuan is one of the few companies in the world that can make the FIW9.

Here are the advantages of FIW
1. Effectively isolating the wires from contact with the surrounding environment can ensure the safety and stability of the electrical system.
2. Able to work normally in high-voltage environments, not easily affected by electrical interference and damage.
3. Good durability and anti-aging performance, it can be used for a long time without deterioration of the insulation layer.
4. Excellent high-temperature resistance, able to withstand the effects of high-temperature environments, not easy to deform or melt.

Here is the example how FIW works on an ordinary transformer

One example of a product that uses FIW is a switching transformer. A switching transformer is a device that converts an input voltage to a different output voltage by using a high-frequency switching circuiSwitching transformers are widely used in power supplies, chargers, adapters, and other electronic devices that require voltage conversion
FIW is suitable for building switching transformers because it can withstand high voltage and high frequency without causing electrical shocks or short circuit If you want to see how FIW is used in a switching transformer