Yes , RM35HZ21FM can detect Overfrequency and underfrequency 50 or 60 Hz.The measurement range 40...70 Hz frequency.
Below is the link for technical datasheet.
https://www.se.com/ww/en/product/RM35HZ21FM/frequency-control-relay-rm35-hz---range-40..70-hz
Released for:Schneider Electric India

