Patent ID: 8760835

Claim:
An arrester comprising: a serial member including voltage nonlinear resistive elements and a pressing spring, the voltage nonlinear resistive elements being stacked, the pressing spring being arranged on one end of the stacked voltage nonlinear resistive elements, the pressing spring biasing the voltage nonlinear resistive elements in a stacking direction thereof; a pair of first electrodes arranged on both ends of the serial member to sandwich the serial member in the stacking direction; a pair of second electrodes each having a circular disk shape and respectively arranged on outer sides of the first electrodes in the stacking direction respectively facing the first electrodes; a plurality of insulating clamp members extending in the stacking direction and arranged around the serial member, each of the insulating clamp members including a bent portion on each end portion of the insulating clamp member, the bent portion being bent toward an axial line of the first electrodes at a position close to where the first electrode and second electrode facing each other; a wedge-shaped member arranged on a radial-direction outer surface side of each of the insulating clamp members and tapered in the stacking direction, wherein each of the second electrodes includes an outer circumferential edge surrounding an outer surface of each of the insulating clamp members, the arrester further comprises: an annular member that is arranged on a stacking-direction inner end surface of the outer circumferential edge and is configured to bias the wedge-shaped member; and a fastening member that is inserted from a stacking-direction inner end surface of the annular member and is configured to fasten the annular member and the second electrode, and wherein the wedge-shaped member is pressed against the second electrode by the annular member, thereby pressing the radial-direction outer surface of the insulating clamp member.