Resistive loads cannot exceed 60% of rated current.
Inductive or capacitive loads cannot exceed 40% of the rated current.
The motor load cannot exceed 20% of the rated current.
Solid-state relays should be equipped with a radiator suitable for their working needs. When the load heat dissipation conditions are poor, the margin should be appropriately relaxed. Avoid short circuiting the load. Overcurrent protection measures: Overcurrent and load short circuit are the main causes of permanent damage to the SSR's internal output thyristor. Fast fuses and air switches are one of the overcurrent protection methods. Fuses can also be used for small capacities.
Overvoltage protection measures: Overvoltage protection can use parallel varistor (MOV). The size of the MOV determines the absorbed power, and the thickness of the MOV determines the protection voltage value. Generally, 471/10D varistor can be selected for 220V series SSR, and 471/10D varistor can be selected for 380V series SSR. Choose 681/10D varistor. For 480V series SSR, you can choose 821/10D varistor.