Dc relay for anti-short circuit current and arc extinction

A DC relay for anti-short circuit current and arc extinction, comprising:

• two static contact leading-out ends;
• a pushing rod assembly;
• a movable contact piece of a straight sheet type, installed in the pushing rod assembly such that movable contacts at two ends of the movable contact piece cooperate with the static contacts at bottom ends of the two static contact leading-out ends under an action of the pushing rod assembly;
• and
• three permanent magnets, a first permanent magnet and a second permanent magnet of the three permanent magnets are respectively arranged at two sides of the movable contact piece in a width direction;
• a space is respectively provided between the first and second permanent magnets and the movable contact piece;
• the first and second permanent magnets are adjacent to one of two movable contacts of the movable contact piece;
• magnetic polarities of the first and second permanent magnets facing one face of adjacent movable contact are the same;
• a third permanent magnet of the three permanent magnets is arranged on one side of the movable contact piece in a length direction;
• a space is provided between the third permanent magnet and the movable contact piece;
• the third permanent magnet is adjacent to another one of the two movable contacts of the movable contact piece;
• a polarity face of the third permanent magnet is substantially perpendicular to the polarity faces of the first and the second permanent magnets, so that an Lorentz force generated by the movable contact piece in an arc extinction magnetic field formed by the three permanent magnets is substantially zero.