Fault route
ZX7-160/200 Breaker Trip MOSFET Short Diagnostic
A small-inverter power-device route for ZX7-160/200 breaker trip or MOSFET short faults.
Quick Answer
Shorted MOSFETs can be the result, not the root cause. Separate DC bus short, top-board power devices, driver transformer and middle-board output load before installing replacement devices.
Diagnostic path
DC bus short → MOSFETs → driver transformer → middle-board load → replacement precheck.
Evidence table
Bus short: bridge/capacitor fault. MOSFET short: top inverter failure. Bad driver transformer: repeat device failure risk. Output diode/transformer load fault can stress inverter.