Rotary mgba ọkụ bụ ụdị mgba ọkụ na-atụgharị aka iji jikwaa mgbanyụ nke kọntaktị bụ isi. E nwekwara ụdị ihe nhazi abụọ nke ntụgharị rotary, ya bụ, otu ihe owuwu otu ogwe osisi na ọtụtụ oghere dị iche iche. Single-pole unit rotary switches na-ejikarị ya na rotary potentiometers na ngwa, mgbe multi-pole multi-okwa rotary switches na-akasị ji maka ịmafe na-arụ ọrụ ala sekit.