Features: Adopting STM8 industrial microcontroller control center Strong and weak currents are isolated through optocouplers for safe operation. The power cord and foot switch cord use screwless quick connection terminals, making them more convenient and reliable. Highprecision single Potentiometer is used for input time and current to ensure reliable and convenient inputThe onboard power supply, status, foot, triggerindicator, and working status are clearly visible. Design a reliable zerocrossing detection circuit to ensure the accuracy of thyristor phase shifting. Compatible with100A SCR. The digital controlinterfacecan display the current time and settings. Specifications: Welding Controller Board Size:approx 8x10.4x6cm/3.15x4.09x2.26in current: 40A / 100A Time input 1-50, unit cycle (1 cycle is 20 milliseconds) Note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1PC Welding Controller Board