General
Type of electric connection	Screw connection
Voltage measurement range 1	540
Voltage measurement range 2	540
Type of voltage measurement range	AC
Response value voltage	540
Min. adjustable delay-on energization time	1
Min. adjustable off-delay time	1
Width	108
Height	90
Depth	67
Operating voltage at AC 50 Hz	230
Operating voltage at AC 60 Hz	230
Rated switch current	4
Supply voltage AC 50 Hz	240
Supply voltage AC 60 Hz	240
Supply voltage DC	240
Voltage type (operating voltage)	AC/DC
Voltage type of supply voltage	AC/DC
With detachable clamps
Single-phase under voltage possible
Three-phase under voltage possible
Single-phase over voltage possible
Three-phase over voltage possible
Single-phase hysteresis possible
Three-phase hysteresis possible
Contains function DC-under voltage
Contains function DC-over voltage
Contains function DC-voltage hysteresis
External power supply required

The CM-UFD.M31 grid feed-in monitoring relay monitors voltage and frequency in single-phase and three-phase networks. In conjunction with inverters with integrated island network detection, it meets the conditions for NA protection according to VDE-AR-N 4105:2018-11 (generation systems on the low-voltage network) or VDE-AR-N 4110:2018-11 (generation systems on the medium-voltage network). For use in old systems, the setting values according to VDE-AR-N 4105:2011 or BDEW (feed-in to the medium-voltage network) can also be selected. The last 99 shutdown causes and their respective times are stored in an alarm memory. The connected coupling switches are also monitored, vector shift detection and ROCOF frequency gradient monitoring are carried out.