Abstract: According to the requirement of conventional substation and intelligent substation, the blocking circuit between the line protection with dual configuration after the "nine unifications" specification is introduced and illustrated. Aiming at the reclosing handle of double protection and single reclosing, introduces the requirements of several mainstream protection manufacturers for "four unified" line protection closing weight, and illustrates with examples how to enable and disable reclosing handle and pressing plate in different modes. For the spring energy storage SF₆ circuit breaker mechanism, the SF₆ lockout signal, SF₆ alarm signal and the spring energy not stored signal are not connected to the low pressure recloser blocking input of the line protection, so the line reclosing charging time is as short as possible, which is beneficial to improving the power supply reliability.