AdoptST main chip, Fairchild optocoupler, TI power supply, pure copper transformer, far superior in mainboard reliability compared to domestic competitors. Uses Taiwan Delta DC 6400 fan, operates only when the signal input to the regulator is adjusted, significantly extending the fan's lifespan. No need for 220V control voltage; the mainboard is suitable for various voltage levels. The main circuit can operate at 220V, 380V, 480V, 660V, etc., with an applicable frequency range of 35-70Hz. The regulator features soft start and soft stop functions. Utilizes Siemens thyristors with low heat generation, ensuring the machine does not overheat. Current range: 20A, 30A, 40A, 50A, 60A, 75A, 80A, 90A, 100A, 120A, 150A, 175A, 200A, 250A, 300A, 350A, 400A, 450A, 500A, 600A, 700A, 800A, 900A, 1000A, 1500A, 2000A, 3000A, 4000A, 5000A. Full function, four-line LCD display, showing the state of the regulator, start/stop control methods, input/output ratios, rated voltage/current, runtime, etc., with bilingual interface. Standard phase, constant voltage, constant current, constant power, zero position, phase + zero position control direct switching, multiple setpoint modes available: analog, digital, communication settings, direct keyboard settings. Smart protection features include missing phase, overtemperature, overcurrent, load wire breakage, load imbalance. When the regulator experiences a thyristor breakdown fault, the relay closes, allowing for tripping signals to the circuit breaker, eliminating the need for fast-blow fuses to reduce costs. High output linearity, precisely controlled by a microcontroller, displaying real-time load current/voltage/power percentage, enabling constant monitoring of the regulator's operating status, suitable for various load types, such as resistive loads, silicon carbide rods, transformers, silicon molybdenum rod loads, with the load center capable of connecting the neutral wire. Input control signals: 4-20mA, 0-20mA, 0-5V, 0-10V, potentiometers, etc. Load current range: 20-5000A, fully covered, suitable for various heating power applications.