It breaks faults at 3 kA per IEC 60947-2 on a 230/400 V AC system, 50/60 Hz.
The C-curve (tripping characteristic class C) means the magnetic trip fires at 5 to 10 times rated current — so 10 A to 20 A for this 2 A breaker. That suits mixed loads with moderate inrush: lighting banks, small transformers, control circuits. If your distribution panel's available fault current exceeds 3 kA, step up to the 10 kA variant (5SL4363-7). Power loss runs 1.25 W per pole in hot operating state — four poles (three active plus one if used as switched neutral) dissipate about 5 W total. That's low enough to ignore derating in a standard 3-module-width (54 mm) enclosure, but if you pack adjacent breakers in a sealed box, sum the losses. IP20 with connected conductors means finger-safe terminals when wired — no protection against dripping water. This breaker lives inside a distribution board or enclosure, not exposed on the line.
Panel integration
Three modular width units at 18 mm each — total 54 mm wide. Snaps onto standard DIN rail; the sealable option lets you lock the toggle position with a lead seal or padlock hasp for LOTO compliance. Halogen-free and silicon-free — no corrosive off-gassing if the breaker arcs internally in a confined panel.