SURGE PROTECTION DEVICE HAVING HIGH BREAKING CAPACITY

摘要

A surge protection device having high breaking capacity, comprising: a housing (1) having at least two lead-out electrodes (10a, 10b); and a voltage-limiting apparatus (2) and a thermal trip mechanism (3) disposed in the housing (1). The thermal trip mechanism (3) comprises a fixed component (30), a movable component (31), and a thermal trigger device (33). The fixed component (30) and the movable component (31) form a plurality of displacement switches arranged in series, and the thermal trigger device (33) and the movable component (31) are linked. The invention solves the problems in which thermal protection devices of existing surge protection devices do not have overcurrent protection functions, and are prone to false tripping or early tripping when surge currents flow through.