The 72 V DC maximum rating means it can also switch DC control circuits, but only up to that voltage. The 18 mm width (one modular unit) and 76 mm depth fit standard DIN-rail enclosures. The -40 °C to 75 °C operating range means it survives the nacelle: no up-tower swaps for cold-soak starts.
The closest peer is the 5SL6006-7, also a 1-module SENTRON MCB with the same 76 mm depth, 18 mm width, 70 mm installation depth, and -40 °C to 75 °C range. The 5SL6006-7 is a 1P+N design (switches neutral) rated 230 VAC single-phase, while the 5SN6103-7CP is a straight 1-pole breaker rated 400 VAC for multi-phase operation. If your panel was wired around the 5SL6006-7 and you need 400 V phase-to-phase capability, the 5SN6103-7CP drops into the same DIN footprint with no rewiring — same 18 mm slot, same terminal range up to 35 mm². The 5SL6006-7 carries a slightly higher 1.4 W power loss per pole; the 5SN6103-7CP runs at 1.3 W.
Snap-on DIN rail mounting, any position. Solid conductors up to 35 mm² fit the terminals; strip length for the cage clamp follows standard practice. The 10 000 mechanical operating cycles typical service life suits panel access for isolation, not daily switching duty.