Construction hoist elevator SRIBS safety devices SAJ30 40 50 60
The SAJ serials pinion and cone progressive safety device is the most important safety device in pinion-and-rack builder hoists, preventing the cage from running over speed and effectively reducing cage-dropping accidents.
The safety devices developed by the Shanghai Research Institute of Building Sciences passed evaluation presided over by the Ministry of Construction in 1989. The specialists at the meeting made a high appraisal of the reasonable compact structure, stable action speed, highly accurate calibration, safe and reliable braking, and light weight etc. features of the safety devices. 
The devices were recommended as high-tech products developed in the National Eighth Five-Year Plan by the Ministry of Construction, and also won the Shanghai Excellent New Product Prize.

The anti-drop safety device is consistent with China National Standards; it also meets Hong Kong COP Standards and European EN Standards.
SAJ40-1.2 is one of the safety devices for SC200/200. Other safety devices include:
Top and bottom limit, cage door electrical and mechanical interlock safety device, landing door electrical and mechanical interlock, anti-exceeding top device, safety hook, anti-overload device, etc.