The left portion of PowerEsim is modules area. User can access Magnetic Builder through here. User can click "More tools" to see more modules.

Magnetic Builder is designed to help user to design magnetic component with least information. User can firstly select an application of the magnetic components. For examples user can click the "Current Xformer" in the Application region, the expert system will recommend a toroid to the user as shown below.

To give sufficient information to our expert system behind, user should enter the operating condition of the application. Then click the button "Recommend Xformer", a transformer's winding details will be shown.