An Experimental Study on Re-interpretation of Minimum Arc Current of Electrical Contact Materials

Makoto HASEGAWA  Yusuke KAMADA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E88-C   No.8   pp.1616-1619
Publication Date: 2005/08/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.8.1616
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on Recent Development of Electro-Mechanical Devices--Selected Papers from International Session on Electro-Mechanical Devices 2004 (IS-EMD2004)--)
Category: Arc Discharge & Related Phenomena
Keyword: 
arc discharge,  minimum arc current,  Ag contacts,  Pd contacts,  

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Summary: 
Arc occurrence rates are measured for Ag and Pd contacts operated in a DC resistive load circuit. Based on the obtained results, it is confirmed that arc certainly occurs at current levels lower than the conventional minimum arc current value for each of the tested contact materials. Arc occurrence rate in general comes close to 100% at the conventional minimum arc current level. Accordingly, careful attention should be paid to use of the term "minimum arc current" in order to avoid misinterpretation thereof.