HD Switch Spent Two Years Designing, Developing and Testing The HD Switch 20 AMP Series PTO Switches. This Design was Successfully Tested to 100,000 Cycles at 20 Amps, and Salt Spray Tested for 72 Hours to achieve IP53 Water Tight Certification. Most Factory PTO Switches are ONLY Rated at 5 AMPS; which is less than the fuse in most machine circuits. The HD Switch 10 AMP Water Tight PTO Switch is a Tough Upgrade Replacement. HD Switch - Engineered Performance