The Cutler‑Hammer S801+ T18N3S is a 180 A, three‑phase soft starter in a T‑frame enclosure, powered by 24 VDC and rated for 200–600 VAC operation with Modbus RTU capability. Common failure modes for this class include coil or winding insulation breakdown (leading to shorted start/stop coils), solid‑state overload relay tripping due to motor overcurrent or overheating, and power supply voltage drops that trigger the internal protection logic. First‑check diagnostics: verify 24 VDC input and 200–600 VAC output are within spec; inspect the coil windings for discoloration or burn marks and test continuity; review any fault codes displayed on the LCD or transmitted via Modbus to identify the specific protection event.[oss-gpt-20b]