The Siemens SENTRON 5SY7432-7CC is a 4-pole miniature circuit breaker with a C-curve tripping characteristic, rated 32 A at 400 V AC. It delivers a 25 kA breaking capacity per IEC 60947-2 — that is the rating that governs fault clearance in industrial panel feeders, not the lower 5 kA per UL 1077. For a 4-module-width DIN-rail unit, that is serious fault-interruption headroom for motor control centers or distribution sub-panels.
Breaking capacity and what it means for your panel
The 25 kA at 400 V AC per IEC 60947-2 is the design-basis rating — this breaker can safely interrupt a fault current up to that level without welding contacts or cascading upstream. The UL 1077 / CSA C22.2 No. 235 listing at 5 kA is a separate supplementary-protector rating for North American panels. If your BOM calls for IEC 60947-2 coordination, the 25 kA figure is the one that governs selectivity with upstream feeders.
Mounting and integration
Snaps onto standard DIN rail via the quick-assembly system, 4-module-width (72 mm). Accepts combined terminal top and bottom for daisy-chaining busbars. Mount in any position; the IP20 rating with connected conductors is typical for enclosed panel use. Vibration resistance per IEC 60068-2-6 covers ±1 mm at 5–25 Hz and 50 m/s² at 25–150 Hz — fine for machine-mounted sub-panels.
Environmental and compliance
Halogen-free and silicon-free construction. Operates from -40 °C to 75 °C ambient, with humidity derating above 55 °C. Overvoltage category III, pollution degree 3 — suitable for fixed-installation industrial environments. Sealable for tamper-proof applications.