The Siemens SENTRON 5SJ6325-7RC is a 3-pole miniature circuit breaker rated at 25 A with a C tripping characteristic, designed for AC branch-circuit protection in distribution boards and control panels.
The 25 A rating applies at both 30 °C and the standard 40 °C ambient (derating curve applies above that). The C characteristic means the magnetic trip operates at 5 to 10 times rated current — 125 to 250 A — so it tolerates the inrush of motor loads, transformers, and fluorescent lighting without nuisance tripping, while still clearing a hard fault. The 6 kA breaking capacity (EN 60898) is the maximum fault current the breaker can safely interrupt at its rated voltage; at 415 V AC phase-to-phase this holds.
Depth of 76 mm and installation depth of 70 mm mean it clears a 100 mm deep enclosure with room for wiring — no tight squeeze. Mounting position is unrestricted, so it can be installed vertically, horizontally, or upside-down without derating. IP20 with connected conductors is the norm for a panelboard interior; the enclosure door provides the environmental seal.