Janitza umg 604e 24v mains analysis device mains analyser cat iii 300v janitza 52 16 222 p the janitza umg 604e is a mains analysis device intended to be used for the measurement and calculation of electrical variables such as voltage current energy work harmonic components etc in building installations at distribution boards and circuit breakers p p the umg604e is permanently installed in control cabinets or small distribution boards it can be installed in any position the meas