The invention relates to a plug which comprises a casing and an installation body. A phase movable contact spring and a zero movable contact spring are installed on the installation body. A lateral press block is arranged above the phase movable contact spring and the zero movable contact spring and comprises a phase end and a zero end, a phase contact head and a zero contact head are arranged onthe installation body, and the phase end and the zero end are separated from the phase contact head and the zero contact head. A button assembly is arranged on the installation body and comprises an electromagnet arranged on the installation body and a sliding part which can slide up and down and is provided with a cavity. A reset spring is arranged in the cavity of the sliding part, a clamp hookis arranged in the lower part of the cavity of the sliding part, and the lateral press block is rotatably connected with a drawing block. The upper part of the drawing block is connected with the electromagnet, a spacing hole is arranged in the middle part of the drawing block, and the clamping hook can be clamped in the spacing hole.