Electrical engineering. Two flat, ferromagnetic reeds which are separated by a small gap and enclosed in a glass capsule filled with an inert gas. A magnetic field will cause the reeds to bend, and the contacts to pull together, thus completing an electrical circuit. The switch is reactivated when the magnetic field is removed.
Reed switches are used in cardiac pacemakers and implantable cardioverter defibrillators (ICDs). Closure of the reed switch by applying a permanent magnet disables sensing, resulting in temporary asynchronous pacing in a cardiac pacemaker or in temporary deactivation of an ICD.
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