In selecting the proper galvanic isolation, first consider the isolation rating required. The galvanic isolation rating defines how high of a voltage the device can protect against. Depending on the region or market, there can be various regulatory criteria or specifications to consider, such as UL, VDE, or CSA levels. Each of these specifications can have different levels of required isolation, such as basic, reinforced, or double isolation.  The working voltage lifetime defines the operating lifetime of the device at a given voltage level, with the longer the lifetime the better. Also, stability over temperature, moisture, and magnetic influences are important criteria, especially in industrial environments. Finally, make sure the selected device can support the required data rates.