Abstract: A surge protector assembly which is easily, quickly and detachably installed in a main board of an electronic appliance for protection from instantaneous overvoltage is disclosed, the assembly has a surge relieving unit which absorbs instantaneous overvoltage in the event of a surge of voltage, a fuse connected to the surge relieving unit in series which cuts off power to the electronic elements in the event of an instantaneous overvoltage, a temperature indicator which varies in color in accordance with temperature of the assembly in order to allow a user to easily check whether the assembly is overheated or adversely affected by instantaneous overvoltage, and a plurality of lead terminals used for detachably attaching the assembly to the main board which enables a timely change of a damaged assembly with a new one.