The MTT MS3021 terminal block PT transmitter reads the AC voltage from a potential transformer, calculates its true RMS value, and outputs a clean, standard DC signal your PLC, DCS, or data logger can use directly. True RMS calculation keeps the reading accurate even on distorted or non-sinusoidal voltage waveforms, which is common on circuits with variable-frequency drives or other power electronics nearby.
Full isolation between input, output, and power keeps the transmitter safely separated from the monitored circuit while still delivering a clean output signal to your control system. The compact DIN-rail housing mounts directly in the panel where the PT wiring lands, and front-accessible zero and span trimmers make on-site calibration straightforward.
It is a practical way to bring AC voltage monitoring — supply voltage, bus voltage, or general power quality checks — into a standard control system without dedicated power-metering hardware.
