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The Durite split charge relay splits the charge from one alternator between the starter and the auxiliary/leisure battery and has a separate terminal for running a separate fridge or similar equipment.
The Hella split charge relay splits the charge from one alternator between the starter and the auxiliary/leisure battery or run a fridge (i.e. it has no separate terminal).
For more split charge systems and options see our battery to battery chargers and alternator to battery chargers.