The invention discloses a rapid tripping device which comprises a mechanism support, a connecting rod device, a contact connecting rod, a main shaft, a moving contact, a static contact, a jump pin anda lock catch assembly device. One end of the jump pin is in lap joint with the lock catch assembly device, the other end of the jump pin is connected with the mechanism support through a rotating shaft, and the moving contact and the static contact make contact with each other in a non-overload state. In the over-loaded state, due to existence of electrodynamic repulsion, the acting force of thejump pin on the buckle surface on the lock catch assembly device is suddenly increased, so the lock plate overcomes the pressure of the lock catch pressure spring to deflect upwards; and the push surface pushes a second lock catch to rotate clockwise, the position of a first lock catch assembly is unlocked after the second lock catch rotates clockwise, the first lock catch assembly rotates clockwise, the buckle surface is separated from the jump pin, the jump pin rotates anticlockwise, the tripping process is completed, and the contact is opened.