Heavy Industrial Transformers and Inductors Built for Production Environments

Steel mills, foundries, cement plants, and large manufacturing facilities operate under conditions standard catalog components were never designed to handle: continuous duty cycles, high ambient temperatures, aggressive vibration, and electrical environments filled with severe switching transients. Selecting the right transformer for heavy industrial applications starts with understanding your actual operating conditions, not simply matching a generic nameplate rating.

Custom Coils has engineered rugged industrial transformers and inductors for demanding production environments since 1967. Every unit is ISO 9001 certified, 100% production tested, and built strictly to customer specification.

Custom Magnetic Solutions for Heavy Industrial Applications

Power Transformers for Heavy Industrial Equipment

Continuous-production facilities need a power transformer designed around their real load profile, not a worst-case guess. Custom Coils selects core geometry, conductor cross-sections, and insulation classes based on your specific duty cycle, ambient temperature, and enclosure requirements.

A transformer supplying auxiliary bus power in a steel mill runs under vastly different thermal and electrical stress than one managing process control in a cement plant. We design for both scenarios individually, treating each unit as the dedicated transformer for heavy industrial applications it needs to be.

High Current Inductors for DC Drives & Induction Heating

Large industrial motor drives such as rolling mills, kiln drives, and press systems depend on a heavy-duty  high current inductor to smooth rectified output and hold consistent torque without ripple. In induction heating power supplies, inductors must manage high AC currents at elevated frequencies while keeping core saturation and copper losses tightly within specification.

We also build output filter inductors for welding power supplies, where high peak currents and fast load transitions are the norm. Core geometry, conductor sizing, and encapsulation are all precision-matched to your industrial application.

Toroidal Transformers for Power Conditioning

When PLCs, servo drives, and sensitive instrumentation share a control panel with large switching loads, an advanced toroidal transformer reduces the electromagnetic interference (EMI) that conventional E-I laminated designs introduce. The closed-core geometry contains the magnetic field, cutting stray EMI directly at the source.

Custom Coils supplies toroidal designs in fully encapsulated construction to withstand environments with coolant mist, metal dust, or elevated humidity making them a highly practical choice wherever panel noise is a recurring problem in heavy industry.

Isolation Transformers for Industrial Control Systems

Ground loops, voltage transients, and common-mode noise are constants in heavy machinery environments. An  isolation transformer provides total galvanic separation between the control power source and the equipment it powers, breaking these interference paths before they reach sensitive electronics.

We engineer creepage distances, clearances, and insulation levels to comply fully with industrial control standards. For many OEMs and systems integrators working with industrial magnetic components, a properly specified isolation transformer is the most cost-effective protection you can put in a control panel.

Specialty Transformers for Unique Industrial Requirements

Electric arc furnace auxiliary circuits, electroplating rectifier supplies, and hydraulic press control systems all share one characteristic: no catalog product fits them. Custom transformers for these applications require engineering from first principles—ensuring the correct turns ratio, insulation class, current rating, and mechanical form factor for the specific installation.

Custom Coils also produces specialty transformers for legacy applications where the original manufacturer has exited the market. Provide a sample unit, nameplate data, or a partial schematic, and we will develop a replacement transformer for heavy industrial applications built to match or exceed the original.

Applications We Support

• Steel mills and rolling mill systems
• Foundries and metal casting facilities
• Cement plants and kiln automation systems
• Industrial DC drives and motor control panels
• Induction heating equipment
• Welding power supply systems
• Electroplating and industrial rectifier equipment
• Hydraulic press control systems
• Industrial communication and plant LAN systems

Why Heavy Industrial OEMs Choose Custom Coils

Every project begins with a technical conversation regarding your operating environment, duty cycle, thermal constraints, and mechanical envelope. We never force catalog parts to fit your design. Our engineering team selects the exact core material, conductor size, and insulation system that fit the job, and we back every unit with full documentation: dimensional drawings, material records, and a 100% production test report.

For OEMs and plant engineers who need power transformers, high current inductors, or other industrial magnetic components built to a real specification, Custom Coils has been the premier domestic answer since 1967.

Get a Custom Quote for Your Industrial Transformer or Inductor

Describe your application, electrical requirements, and operating environment. Our sales engineering team responds with a comprehensive design proposal and quotation, typically within one business day.

[Contact Custom Coils to Discuss Your Project]

Frequently Asked Questions (FAQs)

Q: What insulation classes are available for heavy industrial transformers?

A: Our industrial transformers are available in Class B, F, and H insulation. For high-ambient environments like steel mills or cement plants, Class H is highly recommended to guarantee continuous-duty thermal life.

Q: Can you build encapsulated inductors for foundry or machining environments?

A: Yes. High current inductors and industrial transformers are available with robust epoxy or polyurethane encapsulation to seal out metal dust, airborne coolant mist, and high-humidity environments.

Q: Do you manufacture specialty transformers for electroplating rectifier supplies?

A: Yes. Our specialty transformers for electroplating rectifiers feature multiple secondary windings, precise turns ratios, and center-tapped or multi-phase configurations perfectly matched to your specific plating bath specs.

Q: Can you reverse-engineer a discontinued industrial transformer?

A: Yes. Provide a sample unit or nameplate data, and we will develop a drop-in replacement. Reverse-engineering discontinued custom transformers for legacy production equipment is a core Custom Coils capability.

Q: What current ratings are available for your DC drive inductors?

A: Our high current inductors are custom-designed to your specific rated current, inductance value, and ripple requirement—we do not limit you to a fixed catalog range. Provide your DC bus voltage and motor current, and we will size it accordingly.

Q: What documentation comes with a custom heavy industrial transformer?

A: Every order includes a comprehensive dimensional drawing, material records, and a 100% production test report. Furthermore, our robust ISO 9001 system supports additional documentation like material certifications, FMEA, and detailed process records when specified.