Patent ID: 8824110

Claim:
A power plug, comprising: a) a shell ( 1 ), the shell comprising a first side and a second side, a reset button ( 11 ) and a test button ( 12 ) protruding from the first side, and a live wire pin ( 3 ) and a neutral wire pin ( 2 ) protruding from the second side; b) a circuit board ( 5 ), the circuit board ( 5 ) comprising a leakage protection circuit; c) a stationary contact ( 723 ); d) a movable contact ( 742 ); e) a tripping device; f) a cross arm ( 74 ); g) a push block ( 75 ); and h) a tripping coil ( 76 ); wherein: the circuit board ( 5 ), the stationary contact ( 723 ), the movable contact ( 742 ), the tripping device, the cross arm ( 74 ), and the push block ( 75 ) are arranged inside the shell ( 1 ); the circuit board ( 5 ) is in electric connection with the live wire pin ( 3 ) and the neutral wire pin ( 2 ); the stationary contact ( 723 ) is connected with the live wire pin ( 3 ) and the neutral wire pin ( 2 ); the movable contact ( 742 ) is connected with a power output cord ( 8 ) and connected to or disconnected from the stationary contact ( 723 ); the tripping device controls a connection or disconnection between the movable contact ( 742 ) and the stationary contact ( 723 ); the tripping device comprises: a sliding pedestal ( 71 ) fixed inside the shell ( 1 ), and a sliding part ( 72 ) capable of being pressed down by the reset button ( 11 ) to move downward or upward on the sliding pedestal ( 71 ); the sliding part ( 72 ) comprises: a first inclined plane ( 721 ), and a hook ( 722 ); the movable contact ( 742 ) is driven by the cross arm ( 74 ), and the cross arm ( 74 ) comprises a limiting hole ( 741 ) matching with the hook ( 722 ); the push block ( 75 ) comprises two ends, one end leans against the cross arm ( 74 ), the other end matches with the first inclined plane ( 721 ) and is capable of being pushed by the first inclined plane ( 721 ); an elastic member ( 751 ) is disposed on the push block ( 75 ) for keeping the push block ( 75 ) leaning against the cross arm ( 74 ); a reset spring ( 73 ) is disposed between the sliding part ( 72 ) and the sliding pedestal ( 71 ); the movable contact ( 742 ) is connected with a reset elastic member ( 743 ); the tripping coil ( 76 ) is disposed on one side of the cross arm ( 74 ) opposite to the push block ( 75 ), in electric connection with the circuit board ( 5 ), and de-energized by the test button ( 12 ); a stationary armature ( 761 ) and a movable armature ( 762 ) are disposed inside the tripping coil ( 76 ); an ejector spring ( 763 ) is disposed on one end of the movable armature ( 762 ) opposite to the stationary armature ( 761 ); and an elastic force of the reset spring ( 73 ) is larger than a sum of an elastic force of the elastic member ( 751 ) and an elastic force of the ejector spring ( 763 ); the elastic force of the ejector spring ( 763 ) is larger than the elastic force of the elastic member ( 751 ).