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
Optional Modbus communication
LED operating panel
KULUN / SCR Power Controller
STPR Single-phase SCR Power Controller (Standard)
KULUN STPR: general-purpose single-phase SCR power controller with rich interfaces for kilns, vacuum coating, glass fiber and industrial furnaces.
Output Voltage Range0–100% of mains input voltage
Output Current RangeAC 25–800 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 25–800 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 | |
Power sharing | Not supported | |
Temperature PID loop | Not supported | |
Protection | Mains fault | Protection on mains frequency out of range, undervoltage or input phase loss |
Load aging | Not supported | |
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
General Single-phase Industrial Heating
For industrial furnaces, drying ovens, air heating, pipeline tracing and vessel heat preservation.
Heat Treatment & Material Processing
For quenching furnaces, salt bath furnaces, material heating and auxiliary equipment heating.
Equipment Retrofit
For retrofitting existing single-phase heating cabinets; options follow the load and control signals on site.
FAQ
Is the STPR a power controller or a voltage regulator?
It is a single-phase thyristor power controller that regulates load power according to the operating mode.
Can it be used for pipeline tracing and vessel insulation?
Yes — confirm against the heating tape or element rated current, zoning and control accuracy.
Which firing modes are supported?
Zero-crossing, phase-shift and combined control, chosen by load thermal inertia and process response.
Is communication control supported?
Communication options by model connect to PLC, HMI or host systems.
How to handle a load break?
Check heating elements, terminals, protection devices and current detection — with power off, by qualified personnel.
Selection Inquiry
Share your industry, load conditions, voltage, current, power range and site environment — our engineers will help you confirm the right configuration.
