Digital current relay for AC systems


The CME420 monitors for undercurrent and overcurrent in AC systems, as well as the current between two threshold values. True RMS values are read by the device. Current is displayed in real-time on the digital display. Trip values are explicitly set via the device's built-in menu. Two separate SPDT contacts are available, which can be set for normally energized or normally deenergized operation, latching or non-latching. An external supply voltage is utilized to power the device.

When directly connecting the CME420 to the circuit, up to 16 A of current may be monitored. When connecting an X/5 type current transformer, the ratio of the CT may be entered into the device's settings. This allows explicit values to be entered and displayed of up to 999 A without any hand calculations required.

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