In coastal, rainforest and humid overseas areas, machinery circuit systems are vulnerable to damage. Salt fog and moisture erode line interfaces, sensors and controllers, causing short circuits, signal failure and startup problems. These hidden circuit faults are difficult to troubleshoot and require high maintenance costs. Daily maintenance includes regular inspection of circuit sealing, cleaning of dust and rust on lines, moisture-proof protection for exposed wires and plugs, and sheltering electronic control systems during outdoor parking. Timely ventilation and drying after rainy operation eliminate residual moisture. Regular circuit protection reduces over 80% of circuit faults, lowers downtime risks and adapts to long-term operation in humid coastal areas.