Polymer surge arrester

A polymer surge arrester, comprising:

• a nonlinear resistor;
• metal plates placed on an upper end face and a lower end face of the nonlinear resistor;
• electrodes placed on the upper end face and the lower end face of the nonlinear resistor via the metal plates;
• a plurality of insulating rods placed at peripheries of the nonlinear resistor and the metal plates, and each having an upper end portion and a lower end portion inserted into holes formed in the electrodes;
• a spacer inserted between an inner peripheral surface of the hole of the electrode and an outer peripheral surface of the insulating rod;
• a fixing screw attached to the hole of the electrode;
• and
• a double-ended bolt coupling the metal plate and the electrode together,
• wherein the double-ended bolt has a first screw part and a second screw part opposite in a fastening direction to the first screw part which are provided on a same axis;
• wherein the first screw part is attached to the metal plate;
• and
• wherein the second screw part is attached to the electrode.