Siemens SENTRON 5SY7108-7CC is a 1-pole miniature circuit breaker with C-curve tripping characteristic, rated 8 A at 40 °C and 25 kA breaking capacity per IEC 60947-2 at 440 V AC. It occupies 1 modular width (18 mm) on the DIN rail, mounts in any position, and is intended for mechanical engineering and industrial panel applications.
Rating and deployment context
At 40 °C ambient the continuous rating derates to 7.11 A; at 50 °C it drops to 6.1 A, so if the panel runs hot, size up accordingly. Rated for 440 V AC multi-phase operation, the breaker also carries a DC maximum of 72 V. The 1-pole design switches only the line — neutral is not switched.