DTSU-307 series three-phase rail-mounted energy meters are developed by our company by adopting microelectronics technology and imported large-scale integrated circuits, applying advanced digital sampling processing technology and SMT technology. It is a new type of active energy meter with completely independent intellectual property rights. Its performance is fully in line with the relevant technical requirements of GB / T17215.321-2008 (Level 1 and Level 2 static AC active energy meter), which can accurately and directly measure the active energy consumption of loads in the 50Hz or 60Hz three-phase AC grid, and the meter consists of an 8-digit LCD monitor displaying active and reactive energy, and is equipped with RS485 communication function. The meter has the following features: good reliability, small size, light weight, beautiful appearance, easy to install.