This spot welding control panel features an STM8 industrial single-chip microcomputer as the main control core. Strong and weak electricity are isolated by optocouplers, ensuring safe operation. The power and foot switch use screwless quick-connection terminals for convenient and reliable wiring. A high-precision single potentiometer is used for time and current input, providing convenient adjustment. Onboard power supply, status indicators, pins, trigger indicator, and working status are clearly visible. The zero-crossing detection circuit is designed for phase-shifting control of the silicon-controlled rectifier. The controller is compatible with 40A-100A thyristors. The digital control interface can display the current set time and current. Time input: 1-50, unit (one unit is 20ms), current input (30-99%) Product Name: Spot Welding Control Panel Model: -D01 Thyristor Current: 40A During installation: the motherboard should be kept away from the transformer to avoid strong electromagnetic interference. Note: The spot welding control board is independently developed for DIY or simple resistance welding and controllers. The welding purpose is achieved by adjusting the time and current based on the principle of thyristor phase-shifting trigger. Color: Red Material: PCB+Metal Package Contents: 1 x Control Board, 1 x Display Panel, 1 x Connection Cable, 2 x Rotary Knob Covers Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowable measurement error is +/- 1-3cm.