The Siemens 5SY8402-7 is a 4-pole miniature circuit breaker from the SENTRON family, rated with a C tripping characteristic and a breaking capacity of 70 kA at 400 V AC per IEC 60947-2. It also carries a UL 1077 listing for 5 kA at 480 V AC, making it suitable for both IEC and North American panel designs.
Temperature derating is built into the design: the breaker is rated for ambient conditions up to 95% humidity at 55 °C, 55% at 70 °C, and 35% at 75 °C. Vibration resistance per IEC 60068-2-6 (±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz) confirms it holds up on conveyor lines or compressor skids.