The anti rotation switch is a level controller used for solid materials (including powder, block, granular, gel, etc.). It has the characteristics of good sealing, strong overload capacity, lightweight and easy to install, and large output contact capacity. For materials with different specific gravity, the tension of the spring can be adjusted to achieve this, and the contact part of the material is entirely made of stainless steel. The rotary switch has been widely used in industries such as chemical engineering, plastics, cement, pharmaceuticals, feed, and food. Three bearings support for more reliable operation; Unique sealing design can prevent dust infiltration (actual patent); Stable and reliable torque with adjustable torque size; The blades bear excessive load, and the clutch automatically slips to protect the motor from damage; Mechatronic separated structure, overall disassembly free and easy maintenance; The junction box has a protection level of IP65, good sealing performance, and can be used outdoors; Special blades can be used for low density materials.