The direction of rotation of an engine is invertible only in the case of three-phase motors (the single-phase motor always rotates in the right direction independently of the terminals connection). It is one of the features that must be checked when installing a three-phase pump, the rotation direction must always be the correct one to ensure the right operation. Each manual of our products tell you how to verify the correct direction of rotation, when the pump is already installed and before installation. If the direction of rotation is incorrect, remove the current and reverse two of the three phase conductors. Refer to the specific product manual here on our site or in our DNA software.