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. It occupies 4 modular width units (72 mm) on a DIN rail, with a depth of 76 mm and an installation depth of 70 mm. The C-curve means it trips between 5 and 10 times rated current — the standard choice for general-purpose inductive and motor-starting loads where inrush is moderate, not for purely resistive or high-surge transformer loads.
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. If your panel runs hot, size the load to the derated figure, not the nameplate. 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 combined top and bottom terminals accept both busbar and conductor connections, and the quick-assembly fastening system snaps onto the DIN rail without tools.
Panel integration notes
Mounts in any position on a DIN rail. The 4-MW width (72 mm) and 76 mm depth fit standard distribution boards and sub-distribution panels. IP20 with connected conductors means the busbar area is finger-safe once wired, but the breaker itself is not sealed against dust ingress — keep it inside the enclosure. Ambient humidity limits: 95% up to 55 °C, 55% up to 70 °C, 35% up to 75 °C. Storage temperature range is -40 °C to 75 °C.