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102 Relay Life Appendix D
• Contact Resistance Maximum Value. As the relay begins to wear
out, its contact resistance increases. When the resistance
exceeds a predetermined value, the relay should be replaced.
• Contact Resistance Variance. The stability of the contact resistance
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. Relays can be replaced after a
predetermined number of contact closures. However, this method
requires knowledge of the applied load and life specifications for
the applied load.