The Siemens SENTRON 5SY5250-7CC is a 2-pole miniature circuit breaker (MCB) with a C tripping characteristic, rated at 50 A at 35 °C and designed for DC circuits up to 440 V. The 2-pole design switches both conductors simultaneously, which matters for DC applications where polarity is critical — the listing notes to consider polarity when connecting the supply cord.
The wide ambient range from -40 °C to 75 °C covers outdoor cabinets in cold climates and hot machine compartments, but the current-carrying capacity derates above 35 °C: 47.5 A at 40 °C, 46.2 A at 45 °C, 44.9 A at 50 °C, and 43.5 A at 55 °C. If your BOM calls for a 50 A circuit at 35 °C but the panel ambient runs 50 °C, this breaker still delivers 44.9 A — enough headroom for most continuous loads, but verify against your actual load current.
This MCB is designed for mechanical engineering and industry applications (acc. to IEC 81346-2 designation F). The product is sealable (can be locked in OFF position for LOTO compliance), and touch protection is built in. Vibration resistance per IEC 60068-2-6 covers ±1 mm at 5 to 25 Hz and 50 m/s² at 25 to 150 Hz — suitable for mounting on machinery with moderate vibration.