The Siemens 5SL4515-8 is a SENTRON miniature circuit breaker rated 1.6 A at 230 V AC with a D tripping characteristic and a 10 kA breaking capacity per EN 60898. The 1P+N configuration switches the line and switches the neutral, with neutral conductor switching built in. This is a current-production part — no lifecycle concern for a new BOM line.
What the ratings mean for fit
The D curve (10–20× In magnetic trip) is sized for loads with high inrush — think small transformers, solenoid banks, or motor starters where a B or C curve would nuisance-trip on startup. At 1.6 A the breaker protects a 368 VA load on a 230 V line; the 10 kA SCCR per EN 60898 and IEC 60947-2 means it can interrupt a fault up to 10 kA without upstream damage, which covers most residential and light commercial service entrances. The 1P+N form factor occupies 2 MW (36 mm wide) on a DIN rail, and the neutral pole is switched but not protected — the thermal-magnetic element is on the line pole only.
Temperature derating and environment
Rated current is 1.6 A at 30 °C ambient, but drops to 1.54 A at 40 °C and 1.43 A at 55 °C. If the panel runs warm — typical for a crowded enclosure or near a heat source — size the load accordingly. The breaker is rated for any mounting position, pollution degree 2, overvoltage category III, and the IP20 rating (with connected conductors) is standard for enclosed distribution boards. Operating range is -40 °C to 75 °C, with 95% humidity at 55 °C. Halogen-free and silicon-free construction suits environments where outgassing matters — clean rooms, food processing, or medical facilities.