Passive LC CommonMode and Harmonic Filter Key benefits Suppresses fast transient group interferences that occur at certain user positions, including disturbances with repetition rates of several kilohertz. Efficiently reduces commonmode noise and harmonic content to improve DC power quality. Filters single or multiple harmonics to help purify the direct current supply and reduce electromagnetic interference with nearby equipment. Passive design requires no active control or external power, providing a simple, reliable solution for DC harmonic compensation. What it does (function) Acts as a traditional passive filter composed of inductance and capacitance elements (LC network). Targets commonmode disturbances and specific harmonic frequencies on DC power lines by attenuating unwanted frequency components. Suitable for localized mitigation of repetitive transient interference and ongoing harmonic distortion. Compatibility and installation Designed for use on DC power supplies and DC rails where harmonic compensation and commonmode suppression are needed. Can be installed near converters, power supplies, or sensitive loads to address interference at the point of interest. Passive construction makes it broadly compatible with a wide range of DC systems; check system voltage, current and expected harmonic frequencies when selecting a specific filter variant. Materials and build Constructed from inductors and capacitors arranged to form a passive LC filter. (Exact component types and enclosure options depend on the selected model and application requirements.) Robust passive components provide long service life and predictable performance without active electronics. Performance highlights Effective at suppressing commonmode interference and harmonics, including fast transient groups with repetition rates up to several kilohertz. Capable of targeting one or multiple harmonic orders depending on filter configuration. Improves overall DC power purity, which can reduce malfunctions, communication errors, and EMIrelated disruptions. Typical applications Industrial motor drives and power electronics: reduce DC rail harmonics and commonmode noise that can affect drive performance and downstream equipment. Renewable energy and battery systems: filter harmonics from converters and charge controllers to improve power stability and extend component life. Sensitive DC subsystems (telecom, laboratory instruments, precision sensors): local suppression of repetitive transients and harmonics to protect measurement accuracy and prevent interference. Selection tips Match filter configuration to the harmonic orders and repetition rates present in your system. Specify the expected system voltage and current, and the physical mounting or enclosure requirements, when ordering to ensure compatibility. For localized interference at user positions, position the filter close to the affected load or converter for effectiveness. This passive LC filter provides a practical, reliable way to suppress commonmode disturbances and harmonics on DC supplies, improving power quality and reducing interference without active components.