... quality and reasonable price CRANE CONTROL PUSHBUTTON, Position Spring Return Selector Switch. AC. 50 or 60HZ, rated voltage to 500V, rated current up ... lines, 8 lines, 6 lines, 4lines, 2 linesWork environ ment 1.Environment temperature:-25~+55 2.Air relative humidity : ≤85% 3Normal ... vibration frequency is 2-80HZ, the acceleration is 0.79; remote control switch