... and reasonable price CRANE CONTROL PUSHBUTTON, Position Spring Return Selector Switch. AC. 50 or 60HZ, rated voltage to 500V, rated current ... wharf, machine tools, textile machineries, etc. Other specifications: 10 lines, 8 lines, 6 lines, 4lines, 2 linesWork environ ment 1.Environment ... is 2-80HZ, the acceleration is 0.79; remote control switch