Its headline rating is 70 kA breaking capacity at 400 V AC per IEC 60947-2 — that means it can safely interrupt fault currents up to 70,000 amps without welding contacts or cascading failure upstream. For DC circuits it carries 15 kA, and under UL 1077 it is recognized at 5 kA, so the same unit works in IEC and North American supplemental protection applications.
Where it is used and compliance reach
The 5SY8114-7 is specified for mechanical engineering and industrial applications per the manufacturer's suitability listing. It carries approvals to IEC / EN 60947-2 and UL 1077 / CSA C22.2 No.235, so it is accepted in both IEC and North American jurisdictions.