Siemens SENTRON 5SN6350-7CP — 3-Pole C-Curve MCB
The Siemens 5SN6350-7CP is a 3-pole miniature circuit breaker from the SENTRON 5SN series, with a C-curve tripping characteristic. It is rated for 400 V AC supply voltage and occupies 3 modular width units (54 mm) on a DIN rail, making it a direct fit for standard distribution boards and industrial panel layouts. Breaking capacity is 6 kA according to EN 60898 and 10 kA according to IEC 60947-2 — the higher IEC figure governs its use in industrial control panels where fault current levels are higher than in residential final circuits. The 10 kA SCCR at 400 V means it safely interrupts faults up to that level without cascading upstream.
Ratings and what they mean for fit
Rated for multi-phase operation at 440 V AC maximum, and single-phase operation also at 440 V AC — the same voltage ceiling regardless of how many phases are loaded, so it handles line-to-line faults in a 400 V three-phase system without derating. DC rating tops out at 72 V, which covers 48 V control circuits but not 125 V DC battery banks. Power loss is 3.8 W per pole at rated current in hot operating state, totaling about 11.4 W for the three poles. This is relevant for thermal coordination inside a sealed enclosure — adjacent devices must be spaced or derated if the internal ambient exceeds 40 °C. Operating temperature range spans -40 °C to 75 °C, which covers most outdoor cabinet installations and unheated plant areas. Installation depth is 70 mm, and overall dimensions (76 mm depth, 54 mm width, 90 mm height) match the standard SENTRON 3-pole footprint.
Sourcing and lifecycle
The closest functional peer in the SENTRON family is the 5SL4363-7, which shares the same 3-pole C-curve, same dimensions (76 mm depth, 54 mm width, 90 mm height), and same 10 kA rating per IEC 60947-2. The 5SL4363-7 carries a higher power loss per pole (5 W vs 3.8 W) and a 10 kA EN 60898 rating versus the 6 kA on the 5SN6350-7CP. Both mount on the same DIN-rail footprint and accept conductors up to 35 mm² solid. For a panel originally specified around the 5SL4363-7, the 5SN6350-7CP drops in without rewiring — same pole count, same modular width, same installation depth.