Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum (src_forum@alionscience.com )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Original Message:

Posted by: Daniel Mahoney (dmahoney@draper.com )
Organization:Draper Laboratory
Date posted: Thu Jul 8 15:13:03 US/Eastern 1999
Subject: Relay reliability
Message:
MIL-39016/13 Relays have a life requirement of 100,000 cycles at high level (1 ampere at 28 V dc) and 1,000,000 cycles at low level (10 to 50 milli amperes). Question 1: Can an operational usage at .85 amperes be extrapolated to arrive at a life of 200,000 hours (i.e., a straight line fit of the two requirements above)? Question 2: Is it the load at opening/closing of the relay that is driving this requirement or is it the load while the relay is sitting there in the opened/closed position? A quick response would be grately appreciated.

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