The 3M/821P is a three phase voltage transformer manufactured by Italtronic. This transformer is designed to measure the phase-to-phase voltage of single phase, two-phase and three phase electrical power networks. It features a wide range measurement range (from 0-300V to 0-600V), high accuracy (0.5%), and advanced safety features. It has built-in ground fault and overvoltage protection, and is also UL and CUL safety approved. The 3M/821P offers a wide variety of options, such as external and/or internal mounting configurations, single or three phase (or both) input, and a choice of standard or special ordered output ranges. With its advanced features and flexibility, the 3M/821P makes a great choice for measuring and monitoring your electrical network.