Carlo Gavazzi Energy Management Control Solution For Solar PV Application, Eos-Array Input / Output Unit, 12-28VDC or Self Power From VMU-M, Two Digital In, Two Relay Out. I/O unit suitable to be used in combination with VMU-M modules. VMU-O allows to add, for every single unit, two digital inputs and two relay outputs to a VMU-M based system. Housing for DIN-rail mounting, IP40 (front) protection degree.