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SSR-60DD Solid State Module Relay DC-DC Single Phase SSR 1-120A 60A 80A 120A Current 3-32V 5V 12V DC to 5-60V DC Load Without Cover
You need choose the correct type (the current and the control Mode)
Also a suitable radiator(to dissipate heat of SSR) is improtant.
Notice:
As the generate heat of SSR is too high,SSR must be loaded on Radiator when the current of load is over 10A.And there are must put the thermal Grease Compound between SSR and Radiator.
In meanwhile, the cooling fan is necessary when the current is over 60A.
The Ratio depend on The kind of loading for your Equipment.
Resistive load: 60% Inductive load: 30%