AURORA’s Design “B” Energy Efficient and Design “C” High Torque motors are designed to withstand the most demanding severe duty application requirements. These TEFC motors are all cast iron construction, with enclosures rated IP55 to handle wet and extremely dirty applications. The AURORA line is conservatively rated at a 1.15 Service Factor on all HP ratings. This line is also rated for dual frequency and dual voltage. All motors are inverter capable with a VFD between 10-90Hz.