ABB network protection relay

Grid protection relay for commercial solar systems

The ABB CM-UFD.M33 is a grid feeding monitoring relay, which is connected between the public grid and the distributed generation such as photovoltaic systems, wind turbines, block-type thermal power stations. It monitors the voltage and the frequency in the grid and disconnects the distributed generation whenever the measured values are not within the range of the adjusted thresholds. The fault is indicated by LED and the corresponding plain text message is shown on the display. The CM-UFD.M33 relay can be used in all low voltage plants and in medium voltage plants.