Controlling High-Power loads with the USB port is best accomplished with a combination of a large mechanical relay called a contactor and a solid-state relay controller. When paired together, the computer can safely control the solid-state relay, and the solid-state relay will block the induction of the contactor from the computer. Since a contactor contains a coil, it is an inductive load, and it must be managed accordingly with induction suppression components. Contactors can be rated at many load and coil voltages, but keep in mind, most solid-state relays are rated for AC switching only. A select few DC solid state relays are available, but care should be taken to choose a solid-state relay that matches the coil rating of the contactor. We can assist you in finding the correct solid-state relay and matching contactor if you need help.
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