Unless stated otherwise, all M850 meters listed below have the same specification as the standard M850-MP1 or M850-MPD M850-THD In addition to the standard M850 measurements, the M850-THD measures the THD of the voltage and current inputs. Accuracy: 2% Range: 5%-75% THD Frequency: 45-65Hz Ordering code: M850-THD M850-400 All the functions of the standard M850-MP1 at 400Hz Ordering code: M850-400 M850-BAC All the measurements of the standard meter with BACnet protocol. RS485 plug in communication module required for this option. Ordering code: M850-BAC M850-MVM The M850-MVM has 330mV ac inputs instead of the standard current inputs. The voltages are usually provided by clamp-on miniature current transformers which are ideal for retrofit applications. Ordering code: M850-MVM (Other input values available on request). M850-MPH All the measurements of the standard meter plus an Hours Run option. Ordering code: M850-MPH M850-MPV / M850-MPA The M850-MPV displays LN and LL voltages only. The M850-MPA displays current and maximum demand only. Ordering code: M850-MPV (voltage) and M850-MPA (current)