Saft Power Systems 4111‑66‑12414‑45 is a high‑current industrial DC power supply module used in motor drives and control cabinets. Common failure points on this model include burnt or tripped MOSFETs, degraded capacitors, and damaged protection ICs that can cause over‑voltage shutdowns or no output. For initial troubleshooting, verify the input voltage and polarity with a multimeter, inspect the board for visual signs of component damage (burn marks, bulging caps), and check the status LEDs or error codes on the host controller to confirm whether the supply is in protection mode. If the unit passes these checks but still fails, proceed to isolate the output stage by measuring voltage at key nodes and testing individual MOSFETs for continuity and gate drive integrity.[oss-gpt-20b]