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118 Relay Life
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•
Contact Resistance Maximum Value.
out, its contact resistance increases. When the resistance
exceeds a predetermined value, the relay should be replaced.
•
Contact Resistance Variance.
decreases with age. Using this method, the contact resistance is
measured several (5-10) times, and the variance of the
measurements is determined. An increase in the variance
indicates deteriorating performance.
•
Number of Relay Operations.
predetermined number of contact closures. However, this method
requires knowledge of the applied load and life specifications for
the applied load.
As the relay begins to wear
The stability of the contact resistance
Relays can be replaced after a
Appendix D
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