Siemens 5SY6514-7 — SENTRON 2-pole MCB, C-curve, dual breaking capacity
It carries dual breaking capacities: 6 kA under IEC/EN 60898-1 for residential/commercial branch circuits, and 30 kA under IEC 60947-2 for industrial panel duty — the 60947-2 rating is the one that governs its use in a factory distribution board where fault currents can exceed 10 kA.
Rated for any mounting position, so it works in vertical busway or horizontal sub-panels. The neutral conductor is switched, which matters for IT or corner-grounded delta systems where you need to isolate both poles. The sealable design allows a lockout tagout (LOTO) staple through the toggle — a common plant-safety requirement. Vibration resistance per IEC 60068-2-6 covers ±1 mm at 5–25 Hz and 50 m/s² at 25–150 Hz, so it holds up on conveyor drives or compressor skids.
Supplementary devices (undervoltage release, shunt trip, auxiliary contacts) can be snapped onto the right side. Halogen-free and silicon-free construction meets clean-room and rail-vehicle material restrictions. Approvals cover IEC/EN 60898-1 (household-type MCB), IEC/EN 60947-2 (industrial MCB), UL 1077 (supplementary protector), and CSA C22.2 No. 235. The 5 kA UL 1077 rating is lower than the IEC 60947-2 figure — that's normal for UL supplementary protectors, which don't carry the same SCCR as a full UL 489 breaker. For a UL 508A panel, verify the SCCR coordination with the upstream feeder breaker.