Measurement of Minimum Arc Current of Ag Contacts in DC Resistive and Inductive Load Conditions

Makoto HASEGAWA  Yusuke KAMADA  

IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.8   pp.1160-1163
Publication Date: 2006/08/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.8.1160
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on Recent Development of Electromechanical Devices (Selected Papers from IS-EMD2005))
Category: Arc Discharge & Related Phenomena
arc discharge,  minimum arc current,  Ag contacts,  

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Arc occurrence rates were measured for Ag contacts in DC resistive and inductive load circuits. In inductive load conditions, arc occurrence rates in general came close to 100% at around 0.4 A, the conventional minimum arc current level of Ag. In resistive load conditions, the similar results were obtained with 30 V, while arc occurrence rates close to 50% were still obtained at around 0.4 A with 14 V and 10 V. Careful attention should be paid to the term "minimum arc current" to avoid misinterpretation thereof.