[IEEE Proceedings of the 50th IEEE Holm Conference on Electrical Contacts and the 22nd International Conference on Electrical Contacts Electrical Contacts, 2004. - Seattle, WA, USA (20-23 Sept. 2004)] Proceedings of the 50th IEEE Holm Conference on Electrical Contacts and the 22nd International Conference on Electrical Contacts Electrical Contacts, 2004. - Arc erosion tests and study of surface of Ag-WC contacts after arc switching operations