The 19D-301 three-phase DIN-rail energy meter is an intelligent device for medium and low voltage systems (6-35KV and 0.4KV). It integrates data collection and control functions, provide LCD display show three-phase AC power measurement and calculation, consumption energy value. In addition, 19D-301 also provide optional function, user can choose multi-tariff record, Maximum Demand record, relay alarm output(1 channel) for different site condition. RS485 port support MODBUS-RTU or DL/T645-2007 protocol (can be customized). features: 1.- Central display area: mainly displays measurement data. Energy, current, voltage, power, power factor, frequency, timer (depends one different sub-model, display value may parts of above parameter). 2.- Four LED indicators: Show meter condition (accept customized). 3.- Four keys button: for user set operation.