A reed switch consists of two ic contact tips (reeds) in a capsule filled with inert gas. Reed switches are used for touchless switching. To trigger the contact, a permanent approaches in such a way that one contact tip receives flux from the north pole and the other from the south pole, until they are sufficiently ised to attract and make contact. When the is removed or turned so that the two contact tips have flux from the same pole, the switch opens again. The figures illustrate the functional interaction between reed swit - ches and s. The switching behaviour of a -reed contact arrangement exhibits hysteresis, means, the closing position is diffe - rent from the opening position. The continuous lines show the clo - sing position when a approaches. The dashed lines show the reed contact opening position. Fig. 1: In the arrangement at the top of Fig. 1, the distance from to reed switch is the greatest. This results in a single throw switch. If the moves closer to the reed contact (lower arrangement), or if a stronger is used, the result is a triple throw switch. In this arrangement, very tight switching point tolerances are achie - ved, if the moves about in the region between the outer and inner lobes. This example illustrates the switching behaviour with a rectangular or disc . The same behaviour can be achieved with a ring slid over the reed contact.
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