Interface device

The utility model discloses an interface device, which comprises a plugboard, a socket and a normally-closed switch circuit and is characterized in that a plugging end of the plugboard is provided with a plurality of contact pieces, the contact pieces at least comprise a control contact piece and a power supply contact piece, the control contact piece is connected to control voltage, and the distance from the tail end of the control contact piece to the edge of the plugging end is greater than the distance between the tail end of the power supply contact piece to the edge of the plugging end; an opening of the socket is internally provided with a plurality of contacts which respectively correspond to the contact pieces, the contacts comprise a control contact corresponding to the control contact piece and a power supply contact corresponding to the power supply contact piece, and the distance from the control contact to the opening surface is identical to the distance from the power supply contact to the opening surface; the power supply contact is connected to a power supply through the normally-closed switch circuit, and the control contact is connected to a conduction triggering end of the normally-closed switch circuit. The interface device disclosed by the utility model avoids current fluctuation and discharge arc in hot plugging, and improves the reliability of hot plugging between the plugboard and the socket.