Abstract
THE effects of contact resistance on temperature rise in switches are examined by R. W. J. Cockram in the Electrical Review of August 21. A factor complicating the control of electric circuits is the contact resistance set up between two mating surfaces of metal which at times have to be separated in order to break continuity of supply. The two main methods of decreasing contact resistance-excluding the use of special contact tips-are to increase the contact area and to increase the contact pressure. Contact pressure can be increased only to a certain limit, beyond which it results in a welding-in of contacts. Large contact surfaces are uneconomical; they are, in fact, made as small as possible consistent with a contact pressure low enough to preclude welding-in.
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CONTACT RESISTANCE. Nature 150, 355 (1942). https://doi.org/10.1038/150355a0
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DOI: https://doi.org/10.1038/150355a0