The Siemens 5SL4250-6 is a SENTRON miniature circuit breaker — 2-pole, B-curve, rated 50 A at 400 V AC, with a 10 kA breaking capacity certified to both EN 60898 and IEC 60947-2. The B-curve means it trips magnetically between 3 and 5 times rated current — so a 50 A unit holds through a 150 A inrush but opens by 250 A, which suits resistive and general-purpose loads where motor-starting surges aren't the concern. At 40 °C ambient the continuous rating derates to 46.19 A; at 55 °C it drops to 39.81 A, so if the breaker lives in a warm enclosure, size up accordingly. The 2-pole design switches both phase conductors simultaneously. Frequency is 50/60 Hz.
Panel integration — DIN rail fit and spacing
Mounting position is any — vertical, horizontal, or upside-down — no derating required for orientation. Sealable means the toggle can be locked in the OFF position with a padlock hasp — useful for lockout/tagout during maintenance.
Lifecycle and sourcing — active, no end-of-life signal
The 5SL4250-6 carries a current lifecycle stage — no phase-out notice, no last-time-buy date on record. This is a standard SENTRON catalog item, not a niche or legacy variant. For BOM freeze or long-term projects, the risk of an unplanned EOL is low; the SENTRON 5SL series has broad installed base and active support from Siemens.