Surge protection device with high breaking capacity

A surge protection device with a high breaking capacity, comprising a housing with at least two lead-out electrodes, a voltage limiting device and a thermal tripping mechanism, wherein the voltage limiting device and the thermal tripping mechanism are installed in the housing, wherein

• the voltage limiting device comprises a voltage limiter, a first electrode and a second electrode, wherein the voltage limiter, the first electrode and the second electrode are positioned and installed in an insulating cover;
• the thermal tripping mechanism comprises a fixed assembly, a movable assembly and a thermal trigger device, wherein
• the fixed assembly and the movable assembly form a plurality of displacement switches arranged in series;
• the thermal trigger device is disposed in linkage with the movable assembly, and the thermal trigger device comprises a metal trigger sheet, a fusible alloy and an energy storage member;
• a first end of the metal trigger sheet is fixed on the movable assembly, and a second end of the metal trigger sheet is fixed on the second electrode through welding by the fusible alloy, wherein a displacement of the movable assembly relative to the fixed assembly is limited, and the energy storage member accumulates potential energy to displace the movable assembly relative to the fixed assembly;
• and
• the first electrode is electrically connected to one lead-out electrode of the at least two lead-out electrodes, and both ends of the plurality of displacement switches arranged in series are electrically connected to the second electrode and another lead-out electrode of the at least two lead-out electrodes, respectively.