Browse wiki
Jump to navigation
Jump to search
The following is a synopsis of information … The following is a synopsis of information received via E-mail:</br>On October 17, 2017, Palisades alerted Curtiss-Wright of the failure of the under-voltage dropout mechanism in a molded case circuit breaker to trip the breaker in an under-voltage condition. The specific component was a Westinghouse / Eaton Cutler Hammer P/N KD2200U18, containing CAT# UVH3LB08, Style 1492D79G24 under-voltage release mechanism (manufactured prior to 1999). Six of these components were supplied to Palisades in 1992.</br>Findings indicated that the under-voltage release mechanism's failure was a result of a misalignment of the solenoid due to excessive play in the design/manufacturing process which allowed the plunger to miss the target that would cause the breaker to trip in an under-voltage condition. Palisades identified this failure and mentioned two previous failures, one in 1996, and one in 2009.</br>The under-voltage trip mechanism was redesigned in the 1997-1998 time frame. The new design has not exhibited any reported failures. The observed failure on a 1992 breaker having failed in the installed condition took 50 trials to repeat the failure. Given that the excessive play could be a result of combined tolerances, worn tooling, as well as the design itself, and since the OEM has redesigned this mechanism almost 20 years ago, Curtiss-Wright would recommend end users to conduct their own evaluation to determine if a defect, which could create a substantial safety hazard, exists.reate a substantial safety hazard, exists. +
05:00:00, 17 October 2017 +
53,158 +
15:28:00, 9 January 2018 +
05:00:00, 17 October 2017 +
The following is a synopsis of information … The following is a synopsis of information received via E-mail:</br>On October 17, 2017, Palisades alerted Curtiss-Wright of the failure of the under-voltage dropout mechanism in a molded case circuit breaker to trip the breaker in an under-voltage condition. The specific component was a Westinghouse / Eaton Cutler Hammer P/N KD2200U18, containing CAT# UVH3LB08, Style 1492D79G24 under-voltage release mechanism (manufactured prior to 1999). Six of these components were supplied to Palisades in 1992.</br>Findings indicated that the under-voltage release mechanism's failure was a result of a misalignment of the solenoid due to excessive play in the design/manufacturing process which allowed the plunger to miss the target that would cause the breaker to trip in an under-voltage condition. Palisades identified this failure and mentioned two previous failures, one in 1996, and one in 2009.</br>The under-voltage trip mechanism was redesigned in the 1997-1998 time frame. The new design has not exhibited any reported failures. The observed failure on a 1992 breaker having failed in the installed condition took 50 trials to repeat the failure. Given that the excessive play could be a result of combined tolerances, worn tooling, as well as the design itself, and since the OEM has redesigned this mechanism almost 20 years ago, Curtiss-Wright would recommend end users to conduct their own evaluation to determine if a defect, which could create a substantial safety hazard, exists.reate a substantial safety hazard, exists. +
Has query"Has query" is a predefined property that represents meta information (in form of a <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
00:00:00, 9 January 2018 +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
01:41:13, 2 March 2018 +
15:28:00, 9 January 2018 +
84.395 d (2,025.47 hours, 12.056 weeks, 2.774 months) +
05:00:00, 17 October 2017 +
URL"URL" is a <a href="/Special:Types/URL" title="Special:Types/URL">type</a> and predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> to represent URI/URL values.