Reed switch facts for kids
A reed switch is an electrical switch that changes its position via magnetism. It is turned on by bringing a magnet near to the switch. Once the magnet is pulled away from the switch, the reed switch will go back to its original position. If the magnet is an electromagnet, it is a reed relay. The reed switch was invented at Bell Telephone Laboratories in 1936 by W. B. Ellwood.
Images for kids
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(from top) Single-pole reed switch, four-pole reed switch and single-pole reed relay. Scale in centimeters.
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Reed switch, contact detail.
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Reed switch diagrams from Walater B. Ellwood's 1941 patent, Electromagnetic switch. It illustrates a single pole, double-throw (SPDT) device. Descriptions from the patent text are as follows: Fig. 1 - device shown in nonoperated position Fig. 2 - device shown in operated position Fig. 3 - cross-section 1 - glass envelope 2 - terminal 3 - resilient magnetic member 4 - non-magnetic member 5 - conducting member 6 - magnetic member 7 - insulating piece
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A reed relay from a TXE-3 telephone exchange
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See also
In Spanish: Reed switch para niños
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