To provide a circuit protection structure having a heat sensitive separating device and a hot melt circuit cut-off device to perform double temperature sensing and electrical disconnection.

When excessive current, overheating of a circuit or excessive rising of an environmental temperature occurs, a contact elastic strip 21 of the heat sensitive separating device 20 is curved in an opposite direction with heat to separate to establish electrical disconnection (off). In the case that the temperature of an electric circuit is continuously increased due to non reaction, a delay in reaction or repetition of electrical disconnection (off) and conduction (on) of the heat sensitive separating device 20, a melting element 32 of the hot melt circuit cut-off circuit 30 melts with heat and the electric circuit of a conductor 31 and a second terminal 34 enters an uncoupled state by the biasing force of an elastic component 33 to establish the electrical disconnection (off).