This paper introduces the hardware component, principle and foundation of protective configuration of new-generation protection and control device that is applied to automatic block (power continuous) line of railway distribution substation. The electrical charge entered from the outside of the device adopts 220V/110V strong electrical charge, which has strong anti-interference ability. The device is inserted FT245AM communication chip with USB interface and the man-machine interface can realize high communication speed. The device can communicate with microcomputer monitoring by lonwork field bus technology, and choose the optic fiber as communication medium which has strong anti-interference ability. The protection function of the device is perfect, and it configures the function of local manual close and inspection in the same term. The device can judge automatically to put into reclose or automatic backup power switch-on according to the operation way.