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</html><description>There are two sensitive auxiliary relay in one portion of DC control circuit (relay no.1 &amp; no.2) separated by one semiconductor diode. Two relays (R1, R2), their two run up contacts (C1, C2) and that mentioned diode bridge (D) is located in "H" form. When relay no.1 picks up via related N.O. dry contact, the &hellip;  Read More &raquo;</description><thumbnail_url>https://electrical-riddle.com/wp-content/uploads/2021/08/970599792_10.gif</thumbnail_url></oembed>
