Three output modes: phase-shift, zero-crossing fixed-cycle and zero-crossing variable-cycle
Three closed-loop modes: constant voltage, constant current and constant power (also effective in zero-crossing mode)
Optional built-in temperature PID closed-loop control
True RMS measurement as standard
LCD display; operating panel can be mounted remotely on the cabinet door
With earth-leakage protection
KULUN / SCR Power Controller
APR3L Three-phase SCR Power Controller (High-performance)
KULUN APR3L: high-performance three-phase SCR power controller for industrial, diffusion and sintering furnaces and SiC/MoSi2 heating.
Output Voltage Range0–100% of mains input voltage
Output Current RangeAC 10–3000 A
Features
Specifications
Input | Mains supply | Single-phase AC 110–440 V / 500 V / 690 V, 45–65 Hz |
Control supply | AC 85–265 V, 50/60 Hz | |
Output | Output voltage | 0–100.0% of mains input voltage |
Output current | AC 10–3000 A | |
Performance | Control stability | Better than 0.2% |
Control accuracy | Better than 0.5% | |
Key features | Closed-loop mode | Open loop, constant current, constant voltage or constant power, selectable |
Firing mode | Phase-shift, zero-crossing fixed-cycle, zero-crossing variable-cycle | |
Setpoint signal | Analog, keypad digital or communication setpoint, selectable | |
Inputs | 2 analog inputs, 2 digital inputs | |
Outputs | 1 relay output, NO contact, AC 240 V/3 A, DC 24 V/5 A | |
Communication | Modbus RTU/TCP, PROFIBUS, PROFINET | |
Power sharing | Intelligent power sharing across up to 40 units | |
Temperature PID loop | 8-segment temperature profile; smart PID, fuzzy PID or standard PID; AT auto-tuning | |
Protection | Mains fault | Protection on mains frequency out of range, undervoltage or input phase loss |
Load aging | Protection on load aging fault | |
Overheating | Protection when thyristor temperature > 85 °C | |
Overcurrent | Protection when output current reaches the set multiple | |
Load break | Protection when load current falls below the threshold setting |
Typical Applications
Glass & Glass Fiber Heating
For continuous electric heating processes such as glass melting, tank furnaces, bushing heating, glass fiber heating and crucible fiber drawing.
Kilns & Heat Treatment
For three-phase heating power control of roller kilns, drying ovens, industrial furnaces, quenching furnaces and salt bath furnaces.
Vacuum & Process Heating
For vacuum roll coating, pipeline tracing, vessel heat preservation, air heating and heating loops in equipment manufacturing.
Transformers & Inductive Loads
Usable on rectifier transformers, furnace transformer primary sides and power-frequency induction furnaces; configuration confirmed against site parameters.
FAQ
What loads is it suitable for?
Resistive loads such as SiC heating elements, MoSi2 heating elements and resistance heaters; also transformer and inductive loads after engineering confirmation.
When to use phase-shift plus zero-crossing?
For loads with large cold/hot resistance change or noticeable inrush at start-up; it balances start control and stable operation.
Is constant power control available?
Constant voltage, constant current and constant power control are supported; set according to the load and process.
How to confirm communication options?
Standard RS485 Modbus RTU and other communication options depend on the actual model, options and system protocol.
What are the installation environment requirements?
Install indoors in a dry, ventilated place free of corrosive gas, oil mist and condensation; derate for high temperature or high altitude as required.
Selection Inquiry
Share your industry, load conditions, voltage, current, power range and site environment — our engineers will help you confirm the right configuration.
