The Siemens 5SL4450-7 is a SENTRON 4-pole miniature circuit breaker with a C tripping characteristic, rated 50 A at 30 °C and 10 kA breaking capacity per EN 60898 and IEC 60947-2. It occupies 4 modular width units (72 mm) on a DIN rail, with an installation depth of 70 mm and overall depth of 76 mm. The C-curve trips between 5 and 10 times rated current, making it a fit for general-purpose branch circuits with moderate inrush — motor starters, lighting banks, and small transformers in residential or infrastructure panels.
Ratings & Derating
Rated 50 A at 30 °C, the 5SL4450-7 derates to 47.36 A at 40 °C, 46 A at 45 °C, and 43.09 A at 55 °C — the thermal curve matters when the breaker shares a crowded enclosure with other heat sources. The 10 kA breaking capacity under both EN 60898 and IEC 60947-2 means it safely clears a fault up to that level without upstream coordination failure. Multi-phase operation is rated at 440 V AC maximum, covering standard 400 V three-phase panels with headroom.
Physical & Environmental Fit
Mounts in any position on a standard DIN rail. The 72 mm width (4 modular units) and 70 mm installation depth fit standard distribution boards. IP20 with connected conductors — suitable for enclosed panel use, not for wet or washdown locations. Pollution degree 2 and overvoltage category III align with fixed-installation switchgear. Sealable, halogen-free, silicon-free, and touch-protected terminals simplify compliance for infrastructure and residential builds.