Two-action Drill Accelerator Type SZJQ can be stored energy by hydraulic spring. It should be applied with Model QY? Hydraulic Drilling Jar jointly. The drill collar and Hydraulic Jar (below the Drill Accelerator ) can function an accelerated effect when jarring operates as for making the stuck point gain more jarring force.
ABB Switching Protection & Accessories 1SCA151419R1001
ABB Motor Protection Devices 1SAZ321201R1004
Schneider Electric Miniature Circuit Breakers A9XAH157 
