PURPOSE: A surge protection device is provided to prevent the increase in the inner temperature of a surge protection device during inflow of large capacity surge by including a case filled with heat sensitivity resin. CONSTITUTION: A first input terminal(100) receives power supply. A display unit(300) displays an abnormal state of a surge protection unit(400). A second input terminal(200) conducts the current of the first input terminal to the display unit. The surge protection unit suppresses overcurrent from the first input terminal. A case(500) discharges heat generated from the surge protection unit to the outside. [Reference numerals] (100) First input terminal; (200) Second input terminal; (300) Display unit; (400) Surge protection unit; (500) Case
