A noise filter is a device used to remove high-frequency noise. High-frequency noise is generated from the inverter, which is the power conversion device of the equipment, causes a malfunction and communication failure of the source electronic device, peripheral electronic devices, etc. Noise includes conduction noise, induction noise, radiated noise, etc. and a noise filter is used to remove them. Utilizing the characteristics of a low-pass filter that blocks frequencies higher than the cut-off frequency and passes only low frequencies, it is designed to remove high-frequency noise by incorporating it into the circuit. Single-phase and three-phase products can be selected, and the bundling method is generally screw fastening, but there are also soldering types. The rated current is from 0.3 A to 300 A for large ones.