Nippon india supplies energy monitoring devices and analysers manufactured by carlo gavazi. This company has developed many different models for various requirements of industries for monitoring/logging up to 24 electrical variables measured under trms such as vl-l [avg] vl-n voltages ; i, il currents ; kw, kvar, cosj power ; kwh, kvarh [system] total and partial, harmonic distortion energy etc. These energy monitoring & analyser units are available with programmable ct ratio and some models have programmable pt ratio and rs-485 [modbus], pulse output, analogue output, trip alarm output and other combinations as optional features.