Siemens SENTRON 5SL4114-7 — 0.3 A C-curve MCB, 1-pole, 10 kA
C-curve means the magnetic trip fires at 5 to 10 times rated current (1.5 to 3 A for this 0.3 A unit), so it handles moderate inrush from small transformers or capacitor banks without nuisance tripping. The 0.3 A rating makes it a fit for low-current branch circuits — control transformers, signal supplies, or lighting strings. Rated voltage is 250 V AC single-phase, 440 V AC multi-phase; frequency 50/60 Hz.
Temperature derating and mounting
At 40 °C derate to 0.28 A; at 45 °C to 0.26 A; at 55 °C to 0.24 A.