Custom Transformers & Magnetic Components
Explore KATOY’s main transformer and magnetic-component families. Each technical page covers the product’s design inputs, representative constructions, applications and project-specific verification.
Main Product Families
Choose the family that fits your circuit or equipment. KATOY also evaluates custom magnetic structures beyond the six categories shown here.

High-Frequency Transformers
For switching power conversion, KATOY develops high-frequency transformers around the converter topology, switching frequency, core selection, winding arrangement and insulation requirement. The electrical and mechanical design must match the actual circuit and enclosure. The family page explains the information needed for a custom project and shows additional KATOY constructions.
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Low-Frequency Transformers
KATOY makes low-frequency transformers for 50/60 Hz power, isolation and equipment-level applications. Primary and secondary voltages, load, winding configuration, insulation, temperature rise and mounting space all affect the construction. The family page covers EI-core and other representative formats, design inputs and project-specific verification.
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Toroidal Transformers
Toroidal construction can suit equipment where available space, mounting or stray magnetic field matters. KATOY evaluates winding, insulation, leads and the mechanical arrangement against the electrical and thermal requirements of the application. See the family page for real construction examples and the information needed to specify a custom toroidal transformer.
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Inductors & Chokes
KATOY manufactures inductors and chokes for filtering, energy storage and EMI-related functions in industrial power electronics. Inductance, continuous and peak current, frequency, DCR, saturation behavior and winding arrangement depend on the circuit. The family page compares common-mode and differential-mode functions and outlines useful custom design inputs.
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Reactors
Reactors are specified by their function in an industrial power-electronic system, along with current, inductance, insulation, thermal and mounting requirements. KATOY develops custom reactor constructions for equipment-level power conversion and related applications. The family page explains what to provide for technical evaluation without assuming that every reactor is a line, DC or output reactor.
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Single-Phase & Three-Phase Transformers
KATOY develops single-phase and three-phase transformers for equipment-level AC transformation and industrial systems. Voltage, power, winding connections, insulation, terminals, dimensions and installation conditions determine the appropriate construction. The family page compares the two configurations and shows representative KATOY units for OEM equipment rather than grid-distribution applications.
Explore Single-Phase & Three-Phase Transformers →Custom Projects
KATOY reviews electrical specifications, drawings, reference samples and installation requirements for custom transformer and magnetic-component projects. For detailed construction and engineering guidance, use the relevant family page. Read about KATOY manufacturing in China or send us your project requirements.
Need a Custom Transformer or Magnetic Component?
Send the electrical requirements, drawings, dimensions, application information or a reference sample for technical review.