It has a static coil body that creates a magnetic field when it receives electrical current. This field attracts the armature that rubs against the rotor causing the clutching. As well as the bending spring, the armature can have a core and bearings to make it easier to fit on the shaft on which it is to be braked. The following table shows the sizes available with the corresponding torques of the series 4.60 / 4.61 / 4.61A brakes. More technical information is available by downloading the product's datasheet.