... in this field 4. reliable quality and reasonable price CRANE CONTROL PUSHBUTTON, Position Spring Return Selector Switch. AC. 50 or 60HZ ... current up to 5A as controlling start and stop of remote and widely used in wharf, machine tools, textile machineries, etc ... :-25~+55 2.Air relative humidity : ≤85% 3Normal work when the vibration frequency is 2-80HZ, the acceleration is 0.79; remote control switch