Abstract: An inner plug core of a power plug is provided. The inner plug core includes a main body which is formed with an upper insert hole, a lower left insert hole and a lower right insert hole located substantially at three corners of a triangle defined thereby. A C-shaped tongue member is disposed under the upper insert hole and extends toward a front side of the inner plug core. The tongue member has a bottom transverse plate connected to the main body of the inner plug core by a reinforcing triangular support plate. The tongue member further has a top transverse plate on which an elliptic boss is disposed for receipt within a corresponding elliptic hole formed in a grounding terminal. The top transverse plate of the tongue member is cantilevered to serve as a force arm. Thus, only a light force is needed to press down the transverse plate of the tongue member, permitting the grounding terminal to be easily inserted into the upper insert hole.

Abstract: Disclosed is a safety plug for electrical appliances and mainly includes an upper casing, a lower casing, two pole pins, a cylindrical cartridge fuse and a fuse terminal. The upper casing and the lower casing are slidably and detachably connected with each other by engagement of teeth provided at inner side walls of the upper casing and retaining hooks provided at outer side walls of the lower casing. One of the pole pins is provided at its rear end with an arcuated wrapping conductor to fitly and firmly wrap around a lower half of a first end of the cartridge fuse. The fuse terminal is provided with an .OMEGA.-shaped wrapping conductor to fitly and firmly wrap around a lower half of a second end of the cartridge fuse. These arrangements allow the cartridge fuse to correctly sense the current passing therethrough and the fuse wire in the cartridge fuse to be burned out at overload.