The E5CC is the 1/16th DIN panel cutout version of the E5xC temperature controller product with all the specifications and features standard to the E5xC series. This is the most common series of panel mount temperature controller within the E5xC series and will often have the widest availability, especially on most basic models with minimal options. This would be the suggested series to use unless there is a specific design requirement necessitating use of a different configuration.