The Siemens 5SY6340-8CC is a 3-pole SENTRON miniature circuit breaker (MCB) designed to protect three-phase electrical circuits against overload and short-circuit conditions in industrial power distribution systems. It has a rated current of 40 A with a Type D tripping characteristic, making it suitable for motors, transformers, welding equipment, and other loads with high inrush currents. The circuit breaker is rated for 400 V AC operation and provides a 6 kA breaking capacity for fault protection. It occupies three standard modular widths (54 mm) with a 70 mm installation depth and features dual-chamber terminals that accommodate simultaneous busbar and conductor connections.
