Feature: 1. Integrate in One: Integrates 3 phase electrical phase detection, phase shifting circuit, trigger circuit and 3 set anti parallel one way thyristor in one, without external synchronization transformer 2. Stepless Adjustment: 0‑5VDC, 0‑10VDC, 4‑20mA signal automatic or manual control, finish stepless adjustment of 3 phase load voltage from 0V to full voltage of grid by changing conduction angle of thyristor 3. Photoelectric Isolation: Possess input and output photoelectric isolation, large control power, stepless regulation, high insulation voltage, etc. Small size, light weight with long life 4. Automatic or Manual Control: Simple to use the change of the input voltage to realize automatic control of load power at output, and can also use the external potentiometer(10K) to manually adjust the output power 5. Wide Applicable: Can be used in industrial electric furnaces, electric ovens, lighting, primary side voltage regulation of transformer and other equipment for temperature, light, voltage regulation and other controls Specification: Item Type: SCR Voltage Regulator Input Parameters: External Power Supply: No need Manual Control: 10K potentiometer Analog Quantity Control: 4-20mA, 0-5V, 0-10V LED Display: Yes Output Parameters: Load Voltage Range: 380VAC On State Voltage Drop: Less than 1.5V Minimum Conduction Current: Greater than 50mA Off State Leakage Current: Less than 10mA Frequency Range: 45-65Hz Turn On Time: 10ms Turn Off Time: 10ms Medium Withstand Voltage: 2500VAC/1 minute Working Environment Temperature: -35℃~75℃ Working Voltage of Heat Sink: AC220V. Package List: 1 x Voltage Regulator(with heat sink)1 x Protective Cover Note: The resistive load is more than 2.5 times, and the inductive load is more than 4 times. Use with matching heat sink