====<!--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>
Fig. 6.7 Contact opening with arc formation (schematic)'''Influence of out-gasing from plastics'''
*'''Influence of out<div class="multiple-gasing from plastics'''images">Fig. 6.9<figure id="fig:Histogram_of_the_contact_resistance_Rk">[[File:Histogram of the contact resistance Rk.jpg|left|thumb|<caption>Histogram of the contactresistance R <sub>K</sub> of an electroplated Kpalladium layer (3 μm) with andwithout hard gold flash plating(0.2 μm) after exposure withdifferent plastic materials</caption>]]</figure>
Fig. 6<figure id="fig:Contact resistance with exposure to out gasing from plastics">[[File:Contact resistance with exposure to out gasing from plastics.10: jpg|left|thumb|<caption>Contact resistance with exposure to out-gasing from plastics as a function of numbers ofoperations at 6 V <sub>DC</sub>,100 mA: 1 Silicon containing plastic; 2 Plastics with strongly out-gasing DCcomponents; 3 Plastics with minimal out-gasing components</caption>]]</figure></div><div class="clear"></div>
*'''Influence of corrosive gases on the contact resistance'''
Fig. 6.11: Distribution of cumulative frequency H '''Influence of corrosive gases on the contact resistance for solid contact rivetsafter 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'''
Fig. 6.8: Influences on contact areas in relays
<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>
<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>
*'''Contact Phenomena under the influence of arcing Matertia'''
*'''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 erosionContact Phenomena under the influence of arcing Matertia'''<ul>'''Material transfer'''
Fig<div class="multiple-images"><figure id="fig:Material transfer under DC load">[[File:Material transfer under DC load. 6jpg|left|thumb|<caption>Material transfer under DC load a) Cathode; b) Anode.13 Arc erosion of a Ag<br /SnO> Material: AgNi0.15; Switching parameters: 12V<sub>2DC</sub> contact pair after extreme arcing conditions, 3 A, 2x10<sup>6</sup> perations</caption>]]</figure></div>a) Overall view; b) Partial detail view<div class="clear"></div>
*'''Contact weldingArc erosion'''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
<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>
'''Contact welding'''
<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>]]
</figure>
</div>
<div class="clear"></div>
</ul>
</ul>
==References==
[[Application Tables and Guidance Guideline Data for the Use of Electrical ContactsContact Design#References|References]] [[de:Schaltende Kontakte]]
