■ the scope and purpose
     This series of mine flameproof (mobile substation) vacuum-fed switch (hereinafter referred to Feed Switch), applicable to the coal mine and other media around the presence of explosive gases (methane mixture) environment, the exchange of 50 Hz, 660V , 1140V, to the current 400 A, 500A, 630A of the neutral point is not grounded in the three-phase power grid, as a mobile substation to feed switch (open flat after docking in the mobile substation), or as a separate branch of power distribution master switch or switches Feed, but also for large-capacity starter motor does not frequently use.
■ main characteristics of
1, with under-voltage, overload and short circuit break phase, leakage atresia, leakage and other protection;
2, capacitive current compensation;
3, external afar at Reed button.