Difference between revisions of "Switching Contacts"
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Fig. 6.12: Material transfer under DC load a) Cathode; b) Anode. | Fig. 6.12: Material transfer under DC load a) Cathode; b) Anode. | ||
6 Material: AgNi0.15; Switching parameters: 12VDC, 3 A, 2x10 operations | 6 Material: AgNi0.15; Switching parameters: 12VDC, 3 A, 2x10 operations | ||
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**'''Arc erosion''' | **'''Arc erosion''' | ||
Revision as of 14:31, 1 April 2014
6.4.4 Switching Contacts
- Effects during switching operations
Figure 1 Fig. 6.7: Contact opening with arc formation schematic
- Influence of out-gasing from plastics
Figure 2 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
Figure 3 Fig. 6.10: 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 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