Arc 300 Mosfet Card With 3878Mosfet

The ARC 300 MOSFET top card (main inverter board) is a crucial PCB component in 300-ampere MOSFET-based inverter welding machines, designed to convert DC or rectified AC input to high-frequency AC for welding. These top cards typically feature multiple MOSFETs (often 20 units) mounted on heatsinks to drive the main transformer, supporting high-output welding (7-300A).