Reed contacts feature many properties, by which they considerably outperform standard switching technologies. Components from the company Meder Electronic belong to the top in this segment.
This is an archive article published 08/23/2012. Some information may no longer be up to date and in line with the current state. Please contact us in case of interest.
A reed switch operates on a principle of deformation of magnetically conductive blades in a magnetic field
It can be said, that most of the reed switches outstanding properties result from the fact, that the reed themselves are small, light-weight, and distant only a few hundredths of millimeters (at small types). At the same time, they are hermetically sealed in a glass capsule in a vacuum, or more often - filled with an inert gas. Thanks to this construction, Meder electronic reed contacts (and on their basis produced reed relays and reed sensors) feature mainly these properties:● ability to switch up to 10 000V (common types up to approx. 350V)
● very short operating (switching) time (mS)
● ability to switch or carry extremely small currents (femtoAmper)
● very low parasitic capacitance, that´s why they´re able to transfer even HF signals up to 7 GHz with minimal signal loss
● high isolation resistance, up to 1015 Ohm
● long-term stable and low contact-on resistance (50 miliOhm)
● ability to work in a latching mode
● ability to work in an extreme temperature range (-55 to +200°C)
● reliable even in very demanding dusty, moisty or corrosive environment
● reliable even in vibrating devices (up to 2000 Hz)
● long lifetime. At 5V/10 mA switching, operates reliably up to 1010 cycles.
A reed contact can be considered to be a “sensor” controlled by a magnetic field, most often by a permanent magnet or by a coil, creating a reed relay.
Components with reed contacts can be divided into three basic groups:- reed contacts,
- reed sensors,
- reed relays.
Reed switch vs a mechanical switch
Much useful information can be found in the documents:
- „The Basic Reed Switch“,
- „Reedswitch used with permanent magnet“,
- „Reed Switch used as Reed Relay“
- „Parameters_of_Reed_Switch“.
Selected types are available directly from our stock, upon request, we´re able to provide you with any other type from the Standex-Meder portfolio. In case of interest, please contact us at sales@soselectronic.com.
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