Part identity and key ratings
The Siemens SENTRON 5SL4514-7 is a 1P+N miniature circuit breaker rated 0.3 A at 230 V AC, with a C tripping characteristic and a 10 kA breaking capacity per EN 60898 and IEC 60947-2.
At 0.3 A rated, it protects a very low-current branch circuit; the 10 kA breaking capacity (both EN 60898 and IEC 60947-2) ensures it can safely interrupt a fault up to that level without upstream damage. Rated current derates with ambient temperature: 0.3 A at 30 °C, 0.28 A at 40 °C, and 0.26 A at 55 °C.
Where it is used
This MCB is designed for residential buildings and infrastructure — final subcircuit protection in distribution boards where the load is low (lighting, small control transformers, alarm systems).
