The invention discloses an overcurrent, overload and overheat protector, comprising a shell, an insulating holder, a moving spring component, and a fixed contact component. The insulating holder is mounted within the shell. The moving spring component is mounted on the upper portion of the insulating holder. The fixed contact component is mounted on the lower portion of the insulating holder. The moving spring component is serially connected with the fixed contact component. The moving spring component is provided with a moving contact. The fixed contact component is provided with a fixed contact. When the interior temperature of the shell is higher than a set value or overcurrent or overload occurs, the moving spring component drives the moving contact to pop up and separate from the fixed contact, thus driving the moving spring component to break with the fixed contact component. The overcurrent, overload and overheat protector has the advantages that a PTC (positive temperature coefficient) heating film is mounted in the shell, the PTC heating film is connected with an external power supply when the moving contact pops up and separates from the fixed contact, the protector is avoided being on or off repeatedly, and electrical safety can be guaranteed.