The chart on this slide illustrates the main differences between the standard series and the heavy duty series. As discussed in the previous slide, the standard series is constructed of  polypropylene with a single connection, while the EPCOS heavy duty series is using polyester with a series connection. Additionally, it can be seen that the heavy duty series meets if not surpasses all the main characteristics of the standard X2 series and also has UL60384-14 approval.