High-voltage direct current relay capable of improving insulation capability

A high-voltage direct current relay with improved insulation capability, comprising:

• a ceramic cover;
• two fixed contacts for respectively providing inflow and outflow current;
• and
• one movable contact spring,
• wherein, the two fixed contacts are respectively mounted at a top wall of the ceramic cover, lower parts of the two fixed contacts respectively extend inside a cavity of the ceramic cover, and two ends of the movable contact spring respectively are fitted with bottom ends of the two fixed contacts,
• the ceramic cover having the top wall and a side wall, a through holes for assembling the fixed contacts are provided at the top wall of the ceramic cover,
• each fixed contact of the two fixed contacts is constituted of a head and a body, and the head of the fixed contact is connected above the top wall of the ceramic cover, and one segment of the body of the fixed contact is inserted into the through hole of the ceramic cover;
• and
• wherein one segment of the body of the fixed contact is in clearance fitted with the through hole of the ceramic cover, a first step surface downward is provided at an outer peripheral wall of the one segment of the body of the fixed contact, at a corresponding position, a second step surface upward is provided at an inner peripheral wall of the through hole of the ceramic cover, a contour of a projection of one segment of the inner peripheral wall above the second step surface of the through hole of the ceramic cover on a horizontal plane is larger than a contour of a projection of one segment of the outer peripheral wall above the first step surface of one segment of the body of the fixed contact on the horizontal plane, the contour of a projection of one segment of the outer peripheral wall above the first step surface of one segment of the body of the fixed contact on the horizontal plane is larger than a contour of a projection of one segment of the inner peripheral wall below the second step surface of the through hole of the ceramic cover on the horizontal plane, the contour of a projection of one segment of the inner peripheral wall below the second step surface of the through hole of the ceramic cover on the horizontal plane is larger than a contour of a projection of one segment of the outer peripheral wall below the first step surface of one segment of the body of the fixed contact on the horizontal plane, and a distance between the first step surface and the second step surface is larger than zero, so as to prevent arc spatter from entering into a region of fitting clearance between the fixed contact and the through hole of the ceramic cover above a location where the first step surface fits with the second step surface by utilizing staggered fitting between the first step surface and the second step surface.