Conclusion: industrial heating power should be chosen by load type. AC heating (resistance wire, SiC, MoSi2, furnaces) usually starts with an SCR controller or power regulator; processes needing stable DC, constant voltage/current or low-voltage high-current favour a rectifier, IGBT DC or SCR rectifier supply. The first decision is "AC heating or DC heating", then voltage/current, accuracy, interface and cooling.
1. AC or DC first
Most resistive electric heating (kilns, vacuum furnaces, diffusion furnaces, sintering) is AC, regulated by a controller; electroplating, electrolysis, plasma and some metallurgical loads are DC and need a rectifier. Settling AC/DC first keeps the rest of the selection on track.
2. Where an SCR controller fits
- Resistance wire, SiC, MoSi2, industrial furnaces, diffusion and sintering furnaces, vacuum furnaces.
- Smooth power regulation, temperature closed loop, multi-zone control.
- Thermostat or PLC gives 4-20 mA / 0-10 V and the controller follows.
3. Where a DC / rectifier fits
- Stable DC output, constant V/I control (electroplating, electrolysis).
- Low-voltage high-current, automation-heavy heating and process loads.
- Plasma, arc furnace, submerged-arc and other high-power rectifier metallurgy loads.
4. Three supply types
| Supply type | Nature | Typical use |
|---|---|---|
| Type | Nature | Typical use |
| SCR controller | AC voltage/current regulation (no rectify) | Resistive heating, temp loop |
| SCR rectifier | Thyristor rectify, high current | Submerged/arc furnace, big DC |
| IGBT DC | Switched rectify, fast & accurate | Plasma, electroplating, precise DC |
Decision line: pure AC resistive heating → SCR controller is most economical; need DC and very high current with shock → SCR rectifier; need DC with accuracy and automation → IGBT.
5. What to confirm before selecting
- Load type and process goal (heating object and temperature requirement).
- Input voltage, output voltage, current, power and regulation range.
- Accuracy, interface (4-20mA/0-10V/RS485/PLC) and cooling.
- Protection: over-voltage/current/under-voltage/over-temp/short-circuit.
- Continuous running time, space and environment.
6. FAQ
Can a controller and a rectifier replace each other?
Generally no. A controller still outputs AC and regulates power by load impedance; a rectifier outputs DC for loads needing DC or low-voltage high current. Wrong category means the device cannot drive the load.
Why IGBT instead of SCR for some heating?
IGBT switches faster with finer accuracy and response, fitting DC loads sensitive to waveform and dynamics; SCR is better at huge current and shock resistance. They split by accuracy and current scale.
What is most often missed?
Cooling and continuous running time. High-power supplies heat up; air path, water cooling and ambient directly set rated output and life — not just nameplate power.
7. Timeliness
Timeliness: compiled from KULUN Electric industrial heating power documentation and technical articles, September 2026. Output level, control mode and cooling for a specific model remain subject to the datasheet and project confirmation.
