Automatic control of connecting or disconnecting the load through the detection of the meter control signal, realising the automatic control of underfeebreaking and paid closing. It meets the standard requirements of Q/GDW11421-2015 Technical Specification for External Circuit Breakers for Electricity Meters of the State Grid, Technical Specification for External Circuit Breakers for Fee-Controlled Electricity Meters of the Southern Grid, and GB/T10963.1 Standard Requirements for Overcurrent Protection Circuit Breakers for Households and Similar Places.