Two incoming lines on top, two outgoing lines at bottom — saves mains cabling and simplifies wiring
Optional built-in dual semiconductor fuses
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
True RMS measurement as standard
LED/OLED Chinese & English display; operating panel can be mounted remotely on the cabinet door
KULUN / SCR Power Controller
ST300 Single-phase SCR Power Controller (2-in 2-out)
KULUN ST300: single-phase SCR power controller for kilns, vacuum coating, glass fiber and sapphire. Phase-shift, zero-crossing, constant V/I/P.
Output Voltage Range0–100% of mains input voltage
Output Current RangeAC 10–1500 A
Features
Specifications
Input | Mains supply | Single-phase AC 110–440 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 10–1500 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, 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
Dual-loop Single-phase Heating
For single-phase heating cabinets needing 2-in 2-out wiring, serving dual zones or dual branches.
Kilns & Glass Fiber Heating
For kilns, glass fiber, vacuum coating and industrial resistance heating equipment.
High-current Single-phase Loads
For high-current single-phase heating loops; configure cabling, fusing and cooling as a whole.
FAQ
What does the 2-in 2-out structure do?
It simplifies dual-loop or dual-branch wiring; follow the electrical drawings and load configuration.
Are built-in semiconductor fuses available?
Yes by model and capacity; fuse rating must match the controller, load and short-circuit protection requirements.
Is it suitable for glass fiber and vacuum coating?
Yes for single-phase heating loops; confirm actual current, zones, control mode and process cycle.
What characterizes zero-crossing control?
It suits heating loads with high thermal inertia and reduces higher-harmonic impact.
Can it handle dual-zone control?
Yes per circuit requirements; zone independence, sensors and control logic should be fixed at the design stage.
Selection Inquiry
Share your industry, load conditions, voltage, current, power range and site environment — our engineers will help you confirm the right configuration.
