ST20 three-phase thyristor voltage regulator module is the latest cost-effective product of Sinepower. It is designed for three-phase power regulator control. It adopts 32-bit industrial grade high-performance microprocessor, which integrates with open-loop voltage regulation and close loop constant voltage, constant current and constant power four control methods to choose from, and the highly digital safety standard design supports network remote control and on-site control. The fault alarm and interface parameters are displayed by LED digital tube menu, the setting parameters will be automatically stored. The control board has the functions such as phase loss protection, power-on soft start, soft off, overvoltage protection, overcurrent protection, short circuit protection, and working status indication. It has single-phase or three-phase (only one type can be select for one board) AC trigger mode, which can trigger thyristor below 600A. It is suitable for various load types such as resistive load, inductive load, capacitive load and transformer primary side in various fields of industry. It can be used in power regulators, thyristor power supplies, electric heating furnace temperature control and other equipment.

This AC voltage regulator control board can be customized for single-phase control, and the single-phase model is named ST21.

Technical specifications:
◆ Working power: 220Vac ±15% 50/60HZ (380VAC or 440VAC are customizable)
◆ Main circuit working voltage: 220/380Vac ±15% 50/60HZ
◆ Voltage adjustment range: 0 ~ full scale
◆ Display mode: LED digital tube interface
◆ Phase shift range: 0~178°
   Adjust output resolution: 1/4000
   Stability accuracy: better than ±1% or 1V
◆ Trigger current: ≥ 500mA
   Trigger capacity: ≤ 600A  thyristor
◆ Input signal: DC0-5V, DC0-10V, 0-10mA, 4-20mA, 10K potentiometer adjustment (only one of them can be fixed on one board)
◆ Applicable load: resistive, inductive, capacitive, transformer primary load and other loads.
◆ Alarm relay contact capacity: 250Vac/10A
◆ Dielectric strength: 3500 VRMS
◆ Working environment conditions:
   Ambient temperature: -20°C~ 60°C
   Relative humidity: ≤ 90% RH (no frost)
Indoor installation requirements: no flammable, no explosive, no corrosive gas, no conductive dust, vibration less than 0.5G
Altitude should be less than 3000 meters, more than 3000 meters shall reduce the capacity level.
◆ Dimensions: 180*125*38mm
   Opening size (size between the insatllation holes): 168*113mm
◆ Weight: 0.8KG