4-pole D-curve MCB for industrial panels
The Siemens SENTRON 5SY4402-8 is a 4-pole miniature circuit breaker with a D tripping characteristic, rated 2 A at AC (50/60 Hz). It occupies 4 modular width units (72 mm) and mounts in any position via the quick assembly system. The D curve is sized for loads with high inrush currents — motor starters, transformers, or capacitive banks — where a B or C curve would nuisance trip.
Standards and environmental compliance
Material declarations confirm halogen-free and silicon-free construction, supporting clean-environment and low-corrosion panel specifications. Ambient temperature range spans -40°C to 75°C with derating curves published for 35°C through 60°C (e.g., 1.9 A at 40°C, 1.8 A at 50°C). Humidity limits apply above 55°C per the spec table.