Siemens 5SY7432-8 — 4-pole D-curve MCB, 32 A, 25 kA
The Siemens 5SY7432-8 is a SENTRON miniature circuit breaker with a 4-pole design (4P) and a D tripping characteristic, rated at 32 A at 35 °C. It provides a breaking capacity of 25 kA per IEC 60947-2 and 15 kA per EN 60898, making it suitable for high-fault-current industrial panels where motor or transformer inrush currents would nuisance-trip a C-curve device.
At 32 A rated current, it handles continuous loads up to that value at 35 °C ambient; derate to 30.46 A at 40 °C, 29.66 A at 45 °C, 28.86 A at 50 °C, 28 A at 55 °C, and 27.14 A at 60 °C per the published curve. The 15 kA rating per EN 60898 covers residential and commercial branch-circuit applications. Both ratings are AC only, 50/60 Hz.
The quick assembly system (fastening method) snaps onto the rail without tools. Combined terminal top and bottom simplifies busbar and feed-through wiring. Touch protection (product feature) is built in per the terminal design.