The Siemens 5SL4114-8 is a SENTRON 5SL4 miniature circuit breaker — single-pole, D-curve, rated 0.3 A at 400 V AC with a 10 kA breaking capacity per EN 60898 and IEC 60947-2. It snaps onto a standard DIN rail and occupies one width unit (18 mm). The D tripping characteristic means it tolerates brief inrush currents up to 10–20× rated current before tripping — sized for loads like small transformers or solenoid valves that pull a heavy start surge. At 0.3 A, that's a 3–6 A inrush headroom for a few cycles. Wire terminations accept solid or stranded conductors from 0.75 to 25 mm², torqued to 2.5–3 N·m. The housing is halogen-free and silicon-free, IP20 with conductors connected.
Lifecycle and sourcing
For BOM traceability, the manufacturer provides compliance documentation including RoHS and REACH declarations. The part carries a touch-protection feature and is sealable for tamper-proof installations.
Integration and mounting
Mounts in any position on a DIN rail with an installation depth of 70 mm (total depth 76 mm). The 18 mm width (one module) fits standard enclosure cutouts. Screw terminals accept up to 25 mm² — enough for the feed side of a sub-distribution board. Rated for ambient temperatures from -25 to +55 °C, storage from -40 to +75 °C. Overvoltage category 3, pollution degree 3 typical for fixed-installation switchgear.
Electrical ratings and selectivity
Single-pole switching at 400 V AC phase-to-neutral, with a maximum multi-phase operating voltage of 440 V AC. The D-curve and energy limiting class 3 give it a defined let-through energy profile for selective coordination downstream. Rated breaking capacity is 10 kA under both EN 60898 and IEC 60947-2 — sufficient for residential and light commercial service entrance panels where the prospective fault current stays under that threshold.