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What is the replacement for the DT 3000?

The functional replacement for the DT3000 is the EDR-3000 with removable terminals and Modbus-RTU communications:

EDR-3000A0BA0

66D2213G03

EDR-3000, 4I/4O, Modbus RTU, SM, 5A/1A

EDR-3000A0BA1

66D2213G13

EDR-3000, 4I/4O, Modbus RTU, PM, 5A/1A

Where SM is standard mounting and PM is projection mounting (see TD02602010E for more information). 
The E-Series relays are only available as fixed mounted with removable terminals and are not available with
INCOM communications.  The models listed have RS485/Modbus RTU communications but other
protocols and media are available as well as other options as described in the Technical Data document.