Difference between revisions of "Switching Contacts"

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(Switching Contacts)
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contact: Gold rivet</caption>]]
 
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[[File:Influences on contact areas in relays.jpg|right|thumb|<caption>Influences on contact areas in relays</caption>]]
 
[[File:Influences on contact areas in relays.jpg|right|thumb|<caption>Influences on contact areas in relays</caption>]]
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Revision as of 09:31, 9 January 2023

Switching Contacts

    Effects during switching operations
    Figure 1: Contact opening with arc formation (schematic)

    Influence of out-gasing from plastics

    Figure 2: Histogram of the contact resistance RK of an electroplated palladium layer (3 μm) with and without hard gold flash plating (0.2 μm) after exposure with different plastic materials
    Figure 3: Contact resistance with exposure to out-gasing from plastics as a function of numbers of operations at 6 VDC,100 mA: 1 Silicon containing plastic; 2 Plastics with strongly out-gasing components; 3 Plastics with minimal out-gasing components


    Influence of corrosive gases on the contact resistance


    Figure 4: Distribution of cumulative frequency H of the contact resistance for solid contact rivets after 10 days exposure in a three-component test environment with 400 ppb each of H2S, SO2 and NO2 at 25°C, 75% RH; Contact force 10cN; Measuring parameters: ≤ 40 mVDC,10 mA; Probing contact: Gold rivet
    Figure 5: Influences on contact areas in relays

    /<figure>


    Contact Phenomena under the influence of arcing Matertia

      Material transfer
      <figure id="fig:Material transfer under DC load">
      Figure 5: Influences on contact areas in relays

    Arc erosion

    Figure 6: Arc erosion of a Ag/SnO2 contact pair after extreme arcing conditions a) Overall view; b) Partial detail view

    Contact welding

    Figure 7: Micro structure of a welded contact pair (Ag/SnO288/12 - Ag/CdO88/12) after extremely high current load. a) Ag/SnO288/12; b) Ag/CdO88/12

References

References