M403-BL is a DIN RAIL multifunction analyzer suitable for three-phase (3-4 wires or ARON) connection. It’s self-powered (from the measurement signal) and has a current input capable of measuring from 0.05 up to 63 A without the aid of external current transformers. However, it is possible to set CT and VT ratios at will for higher currents and voltages. It’s designed for all those applications where there is no need to view the parameters on site, but monitoring via serial interfaces is required. It’s equipped with two digital outputs which can be used as alarm or pulse outputs (for energy), a RS485 ModBus RTU serial interface and a ModBus TCP/IP Ethernet output which allows remote monitoring of all measurement and configuration parameters. M403-BL is the ideal instrument for monitor all electric parameters of a three-phase line (voltages, currents, frequency, active – reactive – apparent powers, energies, phase angle, etc.) and in addition to RMS measurements it also provides the fundamental measurements (according to the IEEE 1459-10 standards).