The coil body is static, so no current brush is needed. As in the 2 previous models, the magnetic field produced by the electric current attracts the disc, which catches the set of interior and exterior laminae, braking the shaft on which the core is mounted. They must work in a lubricated medium. The following table shows the sizes available with the corresponding torques of the series 4.25 brakes. More technical information is available by downloading the product's datasheet.