A magnesium battery electrode assembly is described, including a current collector comprising a carbonaceous material and an electrode layer comprising an electrode active material disposed on the current collector. A beam is rotatably coupled to the platform such that the beam rotates about the y-axis. There is at least one aperture formed through a wall of the basket member. A polyphase circulating switch having a low switching delay is derived from a multi-rotator circulating switch by providing programmable rotators having adjustable relative rotator-cycle phases. }, each source having state pi,k selected from a set of states {p1,1, p1,2,. Said means comprises a member being of a material having a higher dielectric constant than the material of said active part and applied next to at least a portion of said active part where a high electric field occurs when a high voltage is applied across the device for obtaining a field grading for a condition of changing of said voltage.