Difference between revisions of "Switching Contacts"
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Fig. 6.14: Micro structure of a welded contact pair (Ag/SnO<sub>2</sub> 88/12 - 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 | after extremely high current load. a) Ag/SnO<sub>2</sub> 88/12; b) Ag/CdO88/12 | ||
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==References== | ==References== | ||
[[Application Tables and Guidance Data for the Use of Electrical Contacts#References|References]] | [[Application Tables and Guidance Data for the Use of Electrical Contacts#References|References]] |
Revision as of 14:28, 8 January 2014
6.4.4 Switching Contacts
- Effects during switching operations
Fig. 6.7 Contact opening with arc formation (schematic)
- 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 resistance with exposure to out-gasing from plastics as a function of numbers of 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
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 H2S, SO2 and NO2 at 25°C, 75% RH; Contact force 10cN; Measuring parameters: ≤ 40 mVDC,10 mA; Probing contact: Gold rivet
Fig. 6.8: Influences on contact areas in relays
- 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 erosion
Fig. 6.13 Arc erosion of a Ag/SnO2 contact pair after extreme arcing conditions a) Overall view; b) Partial detail view
- Contact welding
Fig. 6.14: Micro structure of a welded contact pair (Ag/SnO2 88/12 - Ag/CdO88/12) after extremely high current load. a) Ag/SnO2 88/12; b) Ag/CdO88/12