The utility model provides a formula relay cut straightly, belongs to the electric power tech field. The utility model discloses a support, the first fixed plate of lateral part horizontal installation and the second fixed plate of support, the upper portion of second fixed plate installation electro -magnet, the upper portion installation current conducting plate of electro -magnet, electrical slot is led in two upper portion installations of current conducting plate, leads electrical slot including fixed pipe, graphite packing pipe and second silver strip, the utility model discloses a telescopic link can make two contacts with the same dynamics with lead electrical slot cooperation to make the contact and lead electrical slot to keep in close contact with, reduce contact resistance, avoid contact heating to damage. The utility model discloses a spring can make the contact and lead electrical slot to break away from with iron plate promotion when the electro -magnet is not switched on.