Feature 1MICROCONTROLLER: Adopt for STM8 industrial control center microcontroller, strong and weak currents are insulated through optocouplers to ensure safe operation. 2BOLT TERMINAL: The power cord and pedal switch cord are quickly connected to terminals with bolts, making them convenient and reliable. 3POTENTIOMETER: The spot welder control board adopts high accuracy simple potentiometer, input time and current, has stable performance. 4BOARD STRUCTURE: This controller board is compatible with 40A thyristor, including control panel, display panel, cable matching, and red and green buttons. 5RELIABLE CIRCUIT: Adopting a reliable zero crossing detection circuit to ensure the accuracy of SCR phase shifting and clear and visible working status.Item Type: Spot Welder Control BoardMaterial: PCBColor: RedUse: The control panel of the spot welding machine is an independently developed controller for DIY or simple resistance welding .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Spot Welder Control Board2 x Nuts2 x Gaskets