Does the below "reverse power relay" monitor all of the 3 phases for reverse power? Does it read the current on each phase? Because we might have different power consumptions on each of the 3 phases. We need to detect if any one of the 3 phases has power reversing to the diesel generator. Thank you  

5TT3424  ,  Reverse power relay 3-phase without N for monitoring the load flow direction

5TT3425  ,  Reverse power relay 1- or 3-phase with N for monitoring the load flow direction

https://support.industry.siemens.com/cs/qa/en/view/76891438

Kindly, can one relay protect all three phases? Or do we need three pieces?

https://mall.industry.siemens.com/mall/en/WW/Catalog/Products/10218084

Other brands have this protection of all three phases.

https://www.basler.com/Product/BE1-32R-BE1-32O-U-Directional-Power-Relay

Thank you