An apparatus for electrical protection of an electrical system includes a protection circuit for detecting when silicon controlled rectifier or other control elements in an engine driven generator of a welding-type power source have failed. The bearing structure is connected to the supporting frame and has a bearing plate. The wire fibers may be interspersed with reinforcement such as carbon fibers, in tows or in a mesh of fibers. In another embodiment, a power source is coupled to the top shower plate and the bottom shower plate to generate a plasma between the bottom shower plate and the substrate support. The mixture is next flowed from the venturi assembly to a gasliquid separation tank, where a liquid component of the mixture is passed downstream with a selected dissolved oxygen content and a gas component is directed back for injection into the pressurized fluid flow. The reactions employ as catalyst a Group 2A or Group 2B metal complex of a ligand of formula I, as defined further herein.