The DPD Series settings can easily be modified through an Android App via a smartphone/tablet or via a USB NFC Reader/Writer connected to a computer. Under and over threshold settings can be set, as well as hysteresis and time delays. They are uploaded into the DPD Series by means of its NFC configuration. Neither potentiometer settings nor DIP switches are used for the device set-up, and after it is set-up, it can be password protected, to ensure safety while in use. The DPD02DM44B is delivered with default settings for North American 3-phase 240VAC mains, whereas the DPD02DM44 is delivered with European/Asian settings for 3-phase 400VAC mains. · · · 3-phase voltage and frequency monitoring relay · · Nominal measurement range from 177-552 VAC L-L and 102-318 VAC L-N · · Star or Delta mains · · NFC configuration · · Ultra-high harmonic immunity. For very noisy environments. · · The ACR1252U is a PC-linked NFC Reader that is NFC Forum -certified.