The Siemens SENTRON 5SY7432-7 is a 4-pole miniature circuit breaker with a C-curve tripping characteristic, designed for branch-circuit protection in industrial control panels and distribution boards. It carries a 15 kA breaking capacity per EN 60898-1 and 25 kA per IEC 60947-2, giving it the SCCR headroom to coordinate with upstream devices in a 400 V AC system without cascading failure.
Ratings and what they mean for fit
The C-curve means magnetic trip occurs at 5 to 10 times rated current — the standard choice for motor-starter and transformer primary protection where moderate inrush is expected. The 15 kA rating per EN 60898-1 is the residential/light-commercial benchmark; the 25 kA rating per IEC 60947-2 is the industrial-installation figure that matters for coordination studies in a 400 VAC panel. At DC the breaker is rated 15 kA per IEC 60947-2 up to 72 V. Four poles with no neutral switching — this is a straight 4-pole line-side disconnect for three-phase loads where the neutral is solidly bonded downstream, not switched. The 4 MWU footprint occupies 72 mm of DIN rail, standard for a 4-pole MCB in this class.
Standards and compliance
Dual-classified under IEC/EN 60898-1 and IEC/EN 60947-2 / UL1077. The UL1077 listing means it is recognized as a supplementary protector in North American panels — not a branch-circuit rated breaker per UL 489, so verify the application code before specifying for UL 489-only jobs. Pollution degree 3 and overvoltage category III suit it for fixed-installation industrial environments. Halogen-free and silicon-free construction.