The DTSU1218 three-phase DIN-rail energy meter is designed to measure single- and three-phase AC active energy at rated frequencies of 50 Hz and 60 Hz. It features functions such as prepayment, load control, RS485 communication, and 4G communication. Its performance specifications comply with the technical requirements for energy meters stipulated in the national standards GB/T 17215.321-2021 and GB/T 17215.322-2022.