For nearly five decades, Kiyosh has been the wire-wound resistor partner to induction furnace OEMs and HV equipment manufacturers. Fourteen distinct resistor positions in a modern medium-frequency converter — every one of them designed, wound, and tested to specification in Mumbai.
Wire-wound is the only resistor technology that handles every duty in an induction furnace converter — continuous AC on the damping resistors, pulse energy on the dumps, sub-microhenry inductance on the snubbers, kV-class withstand on the bleeders.
Kiyosh has spent five decades inside that one technology, engineering to the converter rather than selling out of a catalog. Every resistor position gets the resistance, power, voltage, inductance, and cooling construction the OEM specifies — and our winding, termination, and cooling library is deep enough to cover all fourteen positions in a modern MF furnace from a single supplier.
A modern medium-frequency induction furnace converter has 14 distinct resistor positions. Some carry continuous power at switching frequency, some absorb pulse energy during faults, some sit quietly across capacitor banks waiting for shutdown. They differ in duty, cooling, and construction — but every one of them is wire-wound, and every one of them sits within Kiyosh's manufacturing scope.
Each resistor position in an induction furnace converter belongs to one of seven application families. The duty cycle, voltage class, and cooling requirement vary widely — but our manufacturing footprint covers all of them.
Continuous-duty AC resistors engineered for high-capacity harmonic attenuation and resonant tank Q-factor control. Built to withstand relentless AC voltage stress and mitigate high-frequency skin-effect losses — almost exclusively water-cooled, up to 1.5 kW per element.
High-precision, non-inductive resistors that clamp dV/dt, suppress turn-off voltage spikes, and damp resonant ringing. Counter-directional winding geometries — bifilar, Ayrton-Perry, Reverse-Pi — eliminate parasitic inductance by design.
Continuous-duty safety resistors for rapid, predictable dissipation of stored capacitor-bank energy. The critical passive safety fallback during LOTO procedures — sized to IEC 60110-1 discharge time windows.
Pulse and intermittent-duty resistors engineered for high-peak Joule absorption — capacitor inrush at startup, fault-energy suppression during trips, regenerative-brake dissipation. High thermal mass with adiabatic energy handling.
Continuous steady-state voltage division across high-voltage capacitor banks and series semiconductor stacks. Tightly matched sets eliminate voltage asymmetry — preventing the uneven sharing that drives asymmetric component ageing.
High-reliability resistors for Neutral Grounding and Coil Ground-Fault Detection. Engineered to prioritize precise resistance stability over raw dissipation — accurate threshold signaling for protection relays, structural integrity under transient fault currents.
Natural air, forced air, water or oil cooled resistive and reactive loads that verify converter performance at full rated power before connecting the induction coil. Built on the same load-bank engineering platform that has served Indian genset and data-centre acceptance testing for decades.
Each Kiyosh product line maps onto specific positions in the converter. Datasheets for any of these are available on request.
Use this matrix to identify which family covers each position in your converter design. Power-class boundaries are guidelines — actual transition points depend on duty cycle, ambient conditions, and customer preference. Every unit is qualified against the customer's specific application data at quotation.
| Converter rating | A · Filter / Tank | B · Snubbers | C · Bleeder | D · Pulse / Dump | E · Balance | F · Protection | G · Test load |
|---|---|---|---|---|---|---|---|
| Sub-MW (≤ 1 MW) | Air | Air | Air | Air | Standard | Compact | Air / water |
| Medium (1–5 MW) | Water | Water / air | Air | Air | Standard | Standard | Water |
| Large (5–10 MW) | Water, banked | Water | Water option | Air, large | Matched | IP54 | Water, banked |
| Very large (>10 MW) | Water, banked | Water | Water | Water | Matched | Outdoor IP65 | Skid-mounted |
The same in-house ceramic process and resistance-wire winding lines that have served Indian research and HV industry for five decades manufacture the induction-furnace catalog.
Kiyosh has supplied resistors to India's leading research labs, transformer makers, switchgear OEMs and high-voltage equipment builders for nearly half a century. With induction furnace OEMs and power converter manufacturers, that supply relationship is active and growing.
Most Kiyosh induction-furnace resistors are designed to the specific requirements of the converter they sit in. The information below is what we need to start. The more of this you provide upfront, the faster the quotation.
Which of R1–R14, or describe the function
Nominal value and tolerance (%)
Watts dissipated continuously, RMS
Joules per pulse, duration, repetition rate
Operating voltage and impulse / withstand
For water-cooled: insulation between water circuit and electrical circuit
DC, line-frequency, MF (specify Hz)
Maximum permissible inductance (µH)
Air, forced air, or water; inlet temperature and flow available
Maximum dimensions, mounting style, termination type
IEC, IEEE, IS, customer specifications to be met
Quantity per order, target delivery
Brief description of the converter and duty cycle
A technical engineer will respond within two working days with clarification questions and an indicative budget price. Datasheets for any product line are available on request.
Email kiyosh@kiyosh.in →