Direct current contact breaker points null for engine starter

摘要

PURPOSE:To provide good anti-corrosiveness during service in a high oxidative atmosphere, cold environment, and saulty maritime environment by combining stationary cpntacts consisting of Ag-oxide series alloy with a movable contact consisting of tough pitch Cu or Cu-Cr-Zr series alloy. CONSTITUTION:At least one of a pair of stationary contacts 1a, 1b is made of a material obtained through internal oxidation of an alloy consisting of 2-10wt.% Sn, 1-5wt.% In, 0.2-6wt.% Cd, 0.01-1wt.% one of Fe group elements, and Ag as residue, plus some inevitable impurities. A movable contact 2 is, on the other hand, made of a Cu series material consisting of 0.05-1wt.% Cr, 0.005-0.5wt.% Zr, 5-60ppm C, 0.001-0.2wt.% Mg, 0.001-0.2wt.% Si, and Cu as residue, plus some inevitable impurities.