A socket turned off at a limiting temperature includes a live wire conductive plate, live wire terminals, a neutral wire conductive plate, neutral wire terminals, a seat, protective structures, and a support element. The seat installs the live wire conductive plate, the live wire terminals, the neutral wire conductive plate and the neutral wire terminals. A predetermined gap is between a live wire conductive spring plate and a live wire contact portion as well as between a neutral wire spring plate and a neutral wire contact portion. The protective structure provides a force of constraint, allowing the live wire spring plate to contact with the live wire contact portion as well as the neutral wire spring plate to contact with the neutral wire contact portion. The support element provides a supporting force corresponding to the force of constraint.