CEWS CEWS YC64 58Hz-62Hz Frequency Relay is a Rockwell Automation device designed to monitor electrical frequency in the 58 Hz to 62 Hz range. The YC64 model designation identifies its place in the CEWS family and the 58–62 Hz specification defines its intended operating band for 60 Hz power systems. This frequency relay is intended for installation in control panels where precise frequency detection is needed to trigger a signal or control action when the input frequency moves outside the nominal 60 Hz band.
