The market is asking for X2 capacitors with long term capacitance and dissipation factor stability in both the possible mounting configurations: parallel and in series with the main. Industrial, solar, auto on-board battery chargers, and industrial inverters are some of the most popular applications for parallel mounting. For series to the mains configuration, all the low current power supplies must be considered: whitegoods for auxiliary loads, sensors, domestics in general, and energy meters. X2 Film caps are sometime used as coupling devices to the mains when energy meter data is transmitted via power line.