... construction machinery.Features 1. CE certificate2.Four channel switch signal and RS232 output3.Entirely industrial device4.Stable and ... -25 wide voltage power supply7.Reverse polarity protection8.Over loading short circuit protection9.Transistor drive,OC door ... block, Hoist, crane,2.Aerial platform vehicle, lifter3.Automatic orientation platform4.Mining mechanism, oil-well drilling equipment5.Security ...