The Siemens 5SY8250-7 is a 2-pole SENTRON miniature circuit breaker with C-curve tripping characteristic, rated 50 A at 400 V AC. Its 25 kA breaking capacity per IEC 60947-2 means it clears high fault currents in industrial panels without cascading upstream — a solid choice for main or sub-feed protection where the prospective short-circuit current is known to be under 25 kA.
Ratings and fit
The 50 A rating holds at 45 °C ambient; derate to 48.75 A at 50 °C and 47.45 A at 55 °C (–). That 2-module width (36 mm) and 70 mm installation depth fit standard DIN-rail enclosures — no extra gutter space needed for this pole count.
Lifecycle and sourcing
The 5SY8250-7 carries a current lifecycle stage, meaning Siemens still manufactures it as an active catalog line. No official successor has been issued. For BOM-line sourcing, availability and current pricing are confirmed at quote time against an RFQ through independent distribution.
Environmental and compliance
Halogen-free and silicon-free construction (–) suits clean-room or sensitive electronics environments. Sealable terminals allow tamper-proofing after commissioning. Vibration resistance per IEC 60068-2-6 (±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz) means it holds up on machine-mounted panels.