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Can the D65 series 3 phase monitor relays be used with open delta systems?

Yes it can be connected to a open delta System. Please follow the below guidelines

The phase monitor needs to connect to A,B,C. Do not connect to the Ground(GND) or Neutral

2. Select the correct phase monitor using the Phase to phase voltage of the power system, not Phase to neutral or ground voltages.

3. Ensure that actual unbalance is within the acceptable range of the phase monitor relay selected for proper operation or use a relay that does not provide unbalance protection.

Note: Open delta systems are subjected to higher levels of unbalance.