A PLANETARY GEARBOX is used to transfer the highest torque in the most compacted form. Its three main components are a sun gear, a planetary gear, and a ring gear. The sun gear is usually in the middle, with planet gears orbiting around it and receiving torque from it. The outer ring gear, which refers to the housing, meshes with planet gears in the ring gear. Planetary gearboxes have a wide range of applications for different industries.