The present invention relates to the field of low-
voltage electric appliances, in particular to a thermal disconnection and indication mechanism which is applied to a surge protection device. The thermal disconnection and indication mechanism includes: a support frame, an indication element and a push rod which are slidably disposed on the support frame respectively, a conductive sheet which is fixedly disposed on the push rod and acts synchronously with the push rod, a push rod driving member, and an indication element driving member; the conductive sheet is fixed to a second
electrode of a protection element of the surge protection device by means of
welding; and the indication element includes an indication portion and an indication element fitting portion which are connected in a bending manner. When the indication element is located at a first position, the indication element fitting portion is in limiting fit with the push rod. After the conductive sheet and the second
electrode are disengaged from each other, the push rod driving member drives the push rod to slide to release the limiting fit from the indication element fitting portion. The indication element driving member drives the indication element to slide to a second position. The thermal disconnection and indication mechanism is simple in structure, compact in
layout and reliable in action. The present invention further relates to a small-sized surge protection device including the thermal disconnection and indication mechanism.