What this 4-pole C-curve MCB does for the panel
The SENTRON 5SP4450-7 is a 4-pole miniature circuit breaker rated 50 A with a C-curve tripping characteristic — it holds up to 5–10× rated current briefly, then clears the fault. That C-curve is the standard choice for motor and transformer branch circuits where inrush current is present but not extreme. Current lifecycle stage — active catalog number. Sourced to order against RFQ.
50 A continuous rating. That dual rating means it works in both IEC 60898-1 and IEC 60947-2 applications, so you can use it in a panel that requires the higher industrial SCCR.
Installation depth is 70 mm. Top and bottom terminals are tunnel type.
As a current-lifecycle SENTRON product, the 5SP4450-7 is still a standard catalog item. No last-time-buy window has been announced. Compliance documentation (RoHS, REACH, IEC/EN test reports) is available through the standard Siemens documentation portal — the part carries the CE mark and is designed to EN 60898 and IEC 60947-2.