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→13.3.5 Testing Technology
Results of relay life testing using different contact materials are illustrated as an example in Fig. 13.9. For each contact material 10 relays were tested under the prescribed motor load until a failure due to non-opening was detected. For this specific load condition AgNiO. 15 was found to be the best suited contact
===13.3.6 Failure Analysis===
The full clarification of causes for switching device failures, for example relays, is most important for quality assurance. As a starting point the full history of the relay, such as electrical load, environmental conditions, etc. must be recorded. The process flow chart in Fig. 13.10 clearly describes a proven way to conduct a failure analysis.
Fig. 13.10:
Flow diagram for
evaluation of failure
cause in switching
devices for
communications
technology
Following all procedures of such a failure evaluation carefully, the root cause of the defect can most likely be established in order to implement preventive measures limiting future occurrences.
