... gained in switching to double girders.Technical data of overhead cranes CapacityT50/1075/20100/20Spanm10.5~31.5Lifting heightMain hookm122022Aux ... trolleyWorking duty A5,A6,A7Power supplyAC380V/50HZ/3POther requests for overhad cranesPainting:Sand blasting, anti rust painting,Primer and ... the capacity, the crane will give a sharp warning for protection itself. 2. Emergency brake:If the operation staff ...