Difference between revisions of "Switching Contacts"

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===6.4.4 Switching Contacts===
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===<!--6.4.4-->Switching Contacts===
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<ul>
 +
<li>'''Effects during switching operations'''</li>
  
*'''Effects during switching operations'''
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<xr id="fig:Contact_opening_with_arc_formation_schematic"/><!--Fig. 6.7:--> Contact opening with arc formation schematic
  
Fig. 6.7 Contact opening with arc formation (schematic)
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<div class="multiple-images">
 +
<figure id="fig:Contact_opening_with_arc_formation_schematic">
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[[File:Contact opening with arc formation schematic.jpg|left|thumb|<caption>Contact opening with arc formation (schematic)</caption>]]
 +
</figure>
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</div>
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<div class="clear"></div>
  
*'''Influence of out-gasing from plastics'''
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<li>'''Influence of out-gasing from plastics'''</li>
Fig. 6.9:
 
Histogram of the contact
 
resistance R of an electroplated K
 
palladium layer (3 μm) with and
 
without hard gold flash plating
 
(0.2 μm) after exposure with
 
different plastic materials
 
  
Fig. 6.10: Contact resistance with exposure to out-gasing from plastics as a function of numbers of
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<xr id="fig:Histogram_of_the_contact_resistance_Rk"/><!--Fig. 6.9:--> 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
operations at 6 V ,100 mA: 1 Silicon containing plastic; 2 Plastics with strongly out-gasing DC
 
components; 3 Plastics with minimal out-gasing components
 
  
*'''Influence of corrosive gases on the contact resistance'''
+
<xr id="fig:Contact resistance with exposure to out gasing from plastics"/><!--Fig. 6.10:--> Contact resistance with exposure to out gasing from plastics as a function of numbers of operations at 6 V<sub>DC</sub>,100 mA: 1 Silicon containing plastic; 2 Plastics with strongly out-gasing components; 3 Plastics with minimal out-gasing components
  
Fig. 6.11: 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 H<sub>2</sub>S, SO<sub>2</sub> and
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<div class="multiple-images">
NO<sub>2</sub> at 25°C, 75% RH; Contact force 10cN; Measuring parameters: ≤ 40 mV<sub>DC</sub>,10 mA; Probing
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<figure id="fig:Histogram_of_the_contact_resistance_Rk">
 +
[[File:Histogram of the contact resistance Rk.jpg|left|thumb|<caption>Histogram of the contact resistance R<sub>K</sub> of an electroplated palladium layer (3 μm) with and without hard gold flash plating (0.2 μm) after exposure with different plastic materials</caption>]]
 +
</figure>
 +
 
 +
<figure id="fig:Contact resistance with exposure to out gasing from plastics">
 +
[[File:Contact resistance with exposure to out gasing from plastics.jpg|left|thumb|<caption>Contact resistance with exposure to out-gasing from plastics as a function of numbers of operations at 6 V<sub>DC</sub>,100 mA: 1 Silicon containing plastic; 2 Plastics with strongly out-gasing components; 3 Plastics with minimal out-gasing components</caption>]]
 +
</figure>
 +
</div>
 +
<div class="clear"></div>
 +
 
 +
 
 +
<li>'''Influence of corrosive gases on the contact resistance'''</li>
 +
 
 +
<xr id="fig:Distribution of cumulative frequency H of the contact resistance for solid contact rivets"/><!--Fig. 6.11:--> 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 H<sub>2</sub>S, SO<sub>2</sub> and NO<sub>2</sub> at 25°C, 75% RH; Contact force 10cN; Measuring parameters: ≤ 40 mV<sub>DC</sub>,10 mA; Probing
 
contact: Gold rivet
 
contact: Gold rivet
  
Fig. 6.8: Influences on contact areas in relays
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<div class="multiple-images">
 +
<figure id="fig:Distribution of cumulative frequency H of the contact resistance for solid contact rivets">
 +
[[File:Distribution of cumulative frequency H of the contact resistance for solid contact rivets.jpg|left|thumb|<caption>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 H<sub>2</sub>S, SO<sub>2</sub> and NO<sub>2</sub> at 25°C, 75% RH; Contact force 10cN; Measuring parameters: ≤ 40 mV<sub>DC</sub>,10 mA; Probing
 +
contact: Gold rivet</caption>]]
 +
</figure>
 +
</div>
 +
<div class="clear"></div>
 +
 
 +
 
 +
[[File:Influences on contact areas in relays.jpg|right|thumb|Influences on contact areas in relays]]
 +
 
 +
<li>'''Contact Phenomena under the influence of arcing Matertia'''</li>
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<ul>
 +
<li>'''Material transfer'''</li>
 +
 
 +
<xr id="fig:Material transfer under DC load"/><!--Fig. 6.12:--> Material transfer under DC load a) Cathode; b) Anode. <br /> Material: AgNi0.15; Switching parameters: 12V<sub>DC</sub>, 3 A, 2x10<sup>6</sup> operations
 +
 
 +
<div class="multiple-images"><figure id="fig:Material transfer under DC load">[[File:Material transfer under DC load.jpg|left|thumb|<caption>Material transfer under DC load a) Cathode; b) Anode. <br /> Material: AgNi0.15; Switching parameters: 12V<sub>DC</sub>, 3 A, 2x10<sup>6</sup> perations</caption>]]</figure></div>
 +
<div class="clear"></div>
  
 +
<li>'''Arc erosion'''</li>
  
*'''Contact Phenomena under the influence of arcing Matertia'''
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<xr id="fig:Arc erosion of a AgSnO2 contact pair after extreme arcing conditions"/><!--Fig. 6.13:--> Arc erosion of a Ag/SnO<sub>2</sub> contact pair after extreme arcing conditions a) Overall view; b) Partial detail view
*'''Material transfer'''
 
Fig. 6.12: Material transfer under DC load a) Cathode; b) Anode.
 
6 Material: AgNi0.15; Switching parameters: 12VDC, 3 A, 2x10 operations
 
  
*'''Arc erosion'''
+
<div class="multiple-images"><figure id="fig:Arc erosion of a AgSnO2 contact pair after extreme arcing conditions">[[File:Arc erosion of a AgSnO2 contact pair after extreme arcing conditions.jpg|left|thumb|<caption>Arc erosion of a Ag/SnO<sub>2</sub> contact pair after extreme arcing conditions a) Overall view; b) Partial detail view</caption>]]</figure></div>
 +
<div class="clear"></div>
  
Fig. 6.13 Arc erosion of a Ag/SnO<sub>2</sub> contact pair after extreme arcing conditions
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<li>'''Contact welding'''</li>
a) Overall view; b) Partial detail view
 
  
*'''Contact welding'''
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<xr id="fig:Micro structure of a welded contact pair after extremely high current load"/><!--Fig. 6.14:--> Micro structure of a welded contact pair (Ag/SnO<sub>2</sub>88/12 - Ag/CdO88/12) after extremely high current load. a) Ag/SnO<sub>2</sub>88/12; b) Ag/CdO88/12
Fig. 6.14: Micro structure of a welded contact pair (Ag/SnO<sub>2</sub> 88/12 - Ag/CdO88/12)  
+
 
after extremely high current load. a) Ag/SnO<sub>2</sub> 88/12; b) Ag/CdO88/12
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<div class="multiple-images">
 +
<figure id="fig:Micro structure of a welded contact pair after extremely high current load">
 +
[[File:Micro structure of a welded contact pair after extremely high current load.jpg|left|thumb|<caption>Micro structure of a welded contact pair (Ag/SnO<sub>2</sub>88/12 - Ag/CdO88/12) after extremely high current load. a) Ag/SnO<sub>2</sub>88/12; b) Ag/CdO88/12</caption>]]
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</figure>
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</div>
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<div class="clear"></div>
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</ul>
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</ul>
  
 
==References==
 
==References==
 
[[Application Tables and Guideline Data for Use of Electrical Contact Design#References|References]]
 
[[Application Tables and Guideline Data for Use of Electrical Contact Design#References|References]]
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[[de:Schaltende Kontakte]]

Revision as of 14:41, 17 September 2014

Switching Contacts

  • Effects during switching operations
  • Figure 1 Contact opening with arc formation schematic

    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


    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 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


    Influences on contact areas in relays
  • Contact Phenomena under the influence of arcing Matertia
    • Material transfer
    • Figure 5 Material transfer under DC load a) Cathode; b) Anode.
      Material: AgNi0.15; Switching parameters: 12VDC, 3 A, 2x106 operations

      Figure 5: Material transfer under DC load a) Cathode; b) Anode.
      Material: AgNi0.15; Switching parameters: 12VDC, 3 A, 2x106 perations
    • Arc erosion
    • Figure 6 Arc erosion of a Ag/SnO2 contact pair after extreme arcing conditions a) Overall view; b) Partial detail view

      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

      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