The 5943000301 is a ferrite toroidal core designed to provide optimal utilization of intrinsic ferrite material properties in a ring configuration. This toroid features an outer diameter (A) of 12.7 mm, inner diameter (B) of 7.15 mm, and height (C) of 4.9 mm, with an inductance factor (AL) of 440 nH (±20%) and an effective cross-sectional area (Ae) of 0.129 cm². The core is supplied with burnished edges and is available with optional Parylene C coating for smaller applications or thermo-set plastic coating for enhanced dielectric strength (minimum 1000 Vrms breakdown voltage). Common applications include power input filters, ground-fault interrupters, common-mode filters, and pulse and broadband transformers, where the toroidal geometry maximizes ferrite material efficiency and minimizes electromagnetic interference.