FMAD CP 1-Stage Filters for 3-Phase Systems Schurter FMAD CP 1-Stage Filters for 3-Phase Systems are equipped with a neutral line and are extremely compact, making them ideal for use in tight spaces in machinery. These high-performance filters use nanocrystalline ring cores with high inductance to offer better asymmetrical attenuation. Different leakage currents are available for various applications, including ≤3mA for industry, ≤0.5mA for standard, and ≤5µA for medical technology. The FMAD CP series offers 6.3mm x 0.8mm plug-in connections for quick and easy wiring. A metal flange screwed to the chassis provides a good ground connection.