===<!--6.4.4 -->Switching Contacts===<ul>'''Effects during switching operations'''
*'''Effects during switching operations'''<div class="multiple-images"><figure id="fig:Contact_opening_with_arc_formation_schematic">[[File:Contact opening with arc formation schematic.jpg|left|thumb|<caption>Contact opening with arc formation (schematic)</caption>]]</figure></div><div class="clear"></div>
<xr id="fig:fig6.7"/> Fig. 6.7: Contact opening with arc formation schematic'''Influence of out-gasing from plastics'''
<div class="multiple-images">
<figure id="fig:fig6Histogram_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 (0.72 μm) after exposure with different plastic materials</caption>]]</figure> <figure id="fig:Contact resistance with exposure to out gasing from plastics">[[File:Contact opening resistance with arc formation schematicexposure to out gasing from plastics.jpg|rightleft|thumb|<caption>Contact opening 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 arc formation (schematic)strongly out-gasing components; 3 Plastics with minimal out-gasing components</caption>]]
</figure>
</div>
<div class="clear"></div>
*'''Influence of out-gasing from plastics'''
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 '''Influence of corrosive gases on the contact resistance with exposure to out-gasing from plastics as a function of numbers ofoperations at 6 V ,100 mA: 1 Silicon containing plastic; 2 Plastics with strongly out-gasing DCcomponents; 3 Plastics with minimal out-gasing components'''
*'''Influence of corrosive gases on the contact resistance'''
Fig. 6.11<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> andNO<sub>2</sub> at 25°C, 75% RH; Contact force 10cN; Measuring parameters: ≤ 40 mV<sub>DC</sub>,10 mA; Probingcontact: Gold rivet</caption>]]</figure><figure id="fig:Influences on contact areas in relays">[[File:Influences on contact areas in relays.jpg|right|thumb|<caption>Influences on contact areas in relays</caption>]]</figure></div><div class="clear"></div>
Fig. 6.8: Influences on contact areas in relays
'''Contact Phenomena under the influence of arcing Matertia'''
<ul>
'''Material transfer'''
*'''Contact Phenomena <div class="multiple-images"><figure id="fig:Material transfer under the influence of arcing Matertia'''*'''DC load">[[File:Material transfer'''Figunder DC load. 6.12: jpg|left|thumb|<caption>Material transfer under DC load a) Cathode; b) Anode.6 <br /> Material: AgNi0.15; Switching parameters: 12VDC12V<sub>DC</sub>, 3 A, 2x10 operations<sup>6</sup> perations</caption>]]</figure></div><div class="clear"></div>
*'''Arc erosion'''
Fig<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. 6.13 jpg|left|thumb|<caption>Arc erosion of a Ag/SnO<sub>2</sub> contact pair after extreme arcing conditionsa) Overall view; b) Partial detail view</caption>]]</figure></div><div class="clear"></div>
*'''Contact welding'''Fig<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. 6.14: 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>]]</figure></div><div class="clear"></div></ul></ul>
==References==
[[Application Tables and Guideline Data for Use of Electrical Contact Design#References|References]]
[[de:Schaltende Kontakte]]
