DC-AC SSR 120A 3-Phase Solid State Relay, Input DC 3-32V, Output AC 24-480VProduct : Three Phase Solid State Relay Model: SSR 3 D4810 D4825 D4840 D4860 D4880 D48100 D48120 D48150 D48200 Current: 10A 25A 40A 60A 80A 100A 120A 150A 200A Controlmode : DC control AC Controlvoltage : 3 32VDC Load voltage : 24 480VAC Step 1: Choose a correct control Mode DA DC Control AC Step 2: Choose a correct type Current of Equipment Ratio = Current of SSR PS: The Ratio depend on the kind of your loading equipment. Resistive load : 70%,