A rotary switch is a switch operated by rotation. These are often chosen when more than 2 positions are needed, such as a three-speed fan or a CB radio with multiple frequencies of reception or "channels". Rotary switches were used as a channel selectors on television receivers until the early 1970s, as range selectors on electrical metering equipment, as band selectors on multi-band radios, etc.

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  • A rotary switch is a switch operated by rotation. These are often chosen when more than 2 positions are needed, such as a three-speed fan or a CB radio with multiple frequencies of reception or "channels". A rotary switch consists of a spindle or "" that has a contact arm or "spoke" which projects from its surface like a cam. It has an array of terminals, arranged in a circle around the rotor, each of which serves as a contact for the "spoke" through which any one of a number of different electrical circuits can be connected to the rotor. The switch is layered to allow the use of multiple poles; each layer is equivalent to one pole. Usually, such a switch has a detent mechanism so it "clicks" from one active position to another rather than stalls in an intermediate position. Thus a rotary switch provides greater pole and throw capabilities than simpler switches do. Rotary switches were used as a channel selectors on television receivers until the early 1970s, as range selectors on electrical metering equipment, as band selectors on multi-band radios, etc. Modern rotary switches use a "star wheel" mechanism to provide the switching positions, such as at every 30, 45, 60, or 90 degrees. Nylon cams are then mounted behind this mechanism and spring-loaded electrical contacts slide around these cams. The cams are notched or cut where the contact should close to complete an electrical circuit. Some rotary switches are user-configurable in relation to the number of positions. A special toothed washer that sits below the holding nut can be positioned so that the tooth is inserted into one of a number of slots in a way that limits the number of positions available for selection. For example, if only four positions are required on a twelve position switch, the washer can be positioned so that only four switching positions can be selected when in use. (en)
  • Поворо́тний (паке́тний) перемика́ч (вимика́ч) (англ. rotary switch, жарг. пакетник) — електричний, комутаційний апарат з ручним приводом обертового руху, зібраний з окремих блоків — пакетів, кожен з яких має комутувальний пристрій. Він може мати декілька сталих положень та декілька комутаційних елементів. За величинами навантаження (електричними струмами і напругами) поворотні перемикачі можна розділити на дві групи: пакетні вимикачі (перемикачі) навантаження та поворотні перемикачі радіоелектронної апаратури. (uk)
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  • Поворо́тний (паке́тний) перемика́ч (вимика́ч) (англ. rotary switch, жарг. пакетник) — електричний, комутаційний апарат з ручним приводом обертового руху, зібраний з окремих блоків — пакетів, кожен з яких має комутувальний пристрій. Він може мати декілька сталих положень та декілька комутаційних елементів. За величинами навантаження (електричними струмами і напругами) поворотні перемикачі можна розділити на дві групи: пакетні вимикачі (перемикачі) навантаження та поворотні перемикачі радіоелектронної апаратури. (uk)
  • A rotary switch is a switch operated by rotation. These are often chosen when more than 2 positions are needed, such as a three-speed fan or a CB radio with multiple frequencies of reception or "channels". Rotary switches were used as a channel selectors on television receivers until the early 1970s, as range selectors on electrical metering equipment, as band selectors on multi-band radios, etc. (en)
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  • Rotary switch (en)
  • Поворотний перемикач (uk)
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