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Panel switch district selector frame at the Connections Museum in Seattle. The Panel Machine Switching System is a type of automatic telephone exchange for urban service that was used in the Bell System in the United States for seven decades.
Alternatively, in some systems, the process of tap changing may be assisted using a rotary or slider switch. No-load tap changers are also employed in high-voltage distribution-type transformers in which the system includes a no-load tap changer on the primary winding to accommodate transmission system variations within a narrow band around the ...
In electrical engineering, a stepping switch or stepping relay, also known as a uniselector, is an electromechanical device that switches an input signal path to one of several possible output paths, directed by a train of electrical pulses. The major use of stepping switches was in early automatic telephone exchanges to route telephone calls ...
Switches can be designed to respond to any type of mechanical stimulus: for example, vibration (the trembler switch), tilt, air pressure, fluid level (a float switch), the turning of a key , linear or rotary movement (a limit switch or microswitch), or presence of a magnetic field (the reed switch). Many switches are operated automatically by ...
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 "rotor" that has a contact arm or "spoke" which projects from its surface like a cam.
Selector, electrical or mechanical component, a switch; Selector, music scheduling software for radio stations created by Radio Computing Services; Selector, of music, otherwise known as a disc jockey; Selector, a person who made a selection of crown land in some Australian colonies; Selector (sport), person that chooses players for a sports team