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A current transformer (CT) is an electronic device used to detect the magnitude and direction of current flowing through a conductor and convert it into measurable signals (such as voltage, current, or digital signals). As a critical component for current monitoring, control, and protection in power systems, smart devices, and industrial automation, it is hailed as the "nerve endings" of electrical systems.

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Iron-based nanocrystalline common-mode filter inductor cores are core magnetic components specifically designed to address high-frequency electromagnetic interference (EMI) issues in modern electronic devices. Leveraging the unique microstructure and superior magnetic properties of iron-based nanocrystalline alloys, they play a crucial role in the field of electromagnetic compatibility (EMC).

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Iron-based amorphous bulk alloys (also known as iron-based bulk metallic glasses) represent a significant product form of iron-based amorphous alloys. They refer to bulk amorphous alloy materials with centimeter-scale thicknesses, fabricated through specialized processes. Unlike traditional iron-based amorphous ribbons (which are only 20–80 μm thick), iron-based amorphous bulk alloys achieve a breakthrough from "micron-scale ribbons" to "centimeter-scale bulk materials" while maintaining their amorphous atomic structure, thereby opening up entirely new possibilities for the application of amorphous alloys.

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Iron-based amorphous bulk alloys (also known as iron-based bulk metallic glasses) represent a significant product form of iron-based amorphous alloys. They refer to bulk amorphous alloy materials with centimeter-scale thicknesses, fabricated through specialized processes. Unlike traditional iron-based amorphous ribbons (which are only 20–80 μm thick), iron-based amorphous bulk alloys achieve a breakthrough from "micron-scale ribbons" to "centimeter-scale bulk materials" while maintaining their amorphous atomic structure, thereby opening up entirely new possibilities for the application of amorphous alloys.

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Gapped cores refer to the intentional introduction of a non-magnetic space (i.e., an air gap) into the closed magnetic circuit of magnetic materials such as iron-based amorphous alloys or silicon steel sheets. Although the physical dimension of the air gap is typically extremely small (sometimes less than one millimeter), it significantly alters the flow of magnetic flux within the core, making it one of the most powerful yet subtle parameters in the design of magnetic devices. Cut cores represent a critical form in core manufacturing and processing. The core process involves using high-precision mechanical or laser cutting to machine continuous silicon steel strips or wound closed cores into specific shapes or dimensions.

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Coated cores are industrial components in which the core parts of electromagnetic devices, such as motors and transformers (e.g., stators, rotors, or laminations), are covered with an insulating, anti-rust, or anti-corrosion protective film through a specialized coating process. Since these cores are typically fabricated from iron-based nanocrystalline, amorphous, or silicon steel sheets, robust interlaminar electrical insulation is essential to minimize eddy current losses. Consequently, surface coating serves as a critical manufacturing step to enhance core performance, durability, and product yield.

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Square cores are a common cross-sectional shape for electromagnetic components such as transformers and reactors. They are manufactured by winding or stacking iron-based nanocrystalline, amorphous, or silicon steel sheets, followed by a shaping and setting process.

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Common mode inductors, also commonly referred to as common mode chokes, are vital passive components in electronic circuits. Their core function is to suppress common mode interference signals while allowing normal differential mode signals or DC power to pass through without attenuation. This ensures the stable operation of electronic equipment and helps meet electromagnetic compatibility (EMC) standards.

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As a highly cost-effective metallic soft magnetic material, iron-based nanocrystalline alloys are composed of iron, silicon, boron, niobium, and copper. Through a specialized crystallization annealing process, an ultra-fine nanocrystalline grain structure of 10–20 nm is formed internally. This material not only boasts superior magnetic properties, including high saturation magnetic induction, high permeability, and low core loss, but also exhibits excellent toughness and corrosion resistance. Currently, it is progressively replacing silicon steel, permalloy, and ferrites, becoming the preferred choice for manufacturing mid-to-high-frequency transformers, instrument transformers, and common-mode inductors.

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Cobalt-based amorphous ribbons are a type of amorphous soft magnetic alloy fabricated via melt quenching, with cooling rates exceeding 106 °C/s. Primarily composed of cobalt (Co), they are alloyed with iron (Fe), silicon (Si), boron (B), and nickel (Ni). Featuring a long-range disordered atomic structure, these ribbons are free from crystalline defects such as grain boundaries and dislocations found in traditional metals, thereby endowing them with exceptionally superior soft magnetic properties.

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Iron-based amorphous ribbons, fabricated via advanced ultra-rapid quenching at a cooling rate of up to 10⁶ °C/s, form ultra-thin (27±2 μm) ribbons with a unique "short-range order, long-range disorder" atomic structure. This amorphous nature delivers exceptional soft magnetic properties, including high permeability, high saturation magnetic induction, and ultra-low core loss. Perfectly aligned with modern trends toward miniaturization, high-frequency operation, and energy efficiency, these ribbons serve as a superior alternative to silicon steel, permalloy, and ferrites, offering unparalleled physical, chemical, and mechanical performance in power and electronic applications.