The Siemens SENTRON 5SY5432-7 is a 4-pole miniature circuit breaker with a C tripping characteristic, rated 32 A and breaking 10 kA per IEC/EN 60898-2 and UL1077.
Ratings and real-world fit
The 32 A rating holds at 35 °C ambient; above that, the breaker derates — 30.72 A at 40 °C, 30.08 A at 45 °C, 29.41 A at 50 °C, 28.74 A at 55 °C, and 28.03 A at 60 °C. The 10 kA breaking capacity applies to AC per EN 60898; DC breaking is also 10 kA per EN 60898-2, with a rated DC voltage of 880 V. That DC rating is unusually high for a 4-MW MCB — it handles series-string solar or battery-bank circuits where other breakers would arc. Supply can be connected AC in any orientation, but DC polarity must be observed. The 5SY5432-7 is rated for universal current (AC/DC) and carries an overvoltage category II rating with pollution degree 2 — standard for fixed-installation distribution panels. It is sealable, halogen-free, and silicon-free, which simplifies compliance documentation for food, pharma, or clean-room lines.
The 4-MW width (72 mm) and 76 mm depth fit standard distribution boards and sub-distribution panels. Ambient humidity limits: 95% up to 55 °C, 55% up to 70 °C, 35% up to 75 °C.