The 5SY7304-8 is a Siemens SENTRON miniature circuit breaker, 3-pole, with a D tripping characteristic. It is rated 15 kA breaking capacity per EN 60898-1 and 40 kA per IEC 60947-2 at 400 V AC; the 40 kA figure is the one that governs SCCR in an industrial panel where the prospective fault current may exceed the domestic standard. For DC circuits, it breaks 15 kA at up to 72 V DC.
Compliance documentation covers IEC / EN 60898-1, IEC / EN 60947-2, and UL 1077. The part is halogen-free and silicon-free.
Panel integration
Height is 90 mm. No neutral conductor switching — this is a 3-pole device for three-phase circuits only. The sealable design allows panel builders to lock settings after commissioning.