The Siemens SENTRON 5SY8432-7 is a 4-pole miniature circuit breaker with a C-trip characteristic, rated for 30 kA breaking capacity per IEC 60947-2 and 15 kA at DC per the same standard. 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 — fits standard distribution boards without extra clearance behind the rail.
Ratings and compliance
Rated operating voltage is 400 V AC, with a maximum of 440 V for both single-phase and multi-phase operation. DC-side rating is 60 V, maximum 72 V. The C-curve (tripping characteristic class C) means it holds up to 5–10× rated current briefly — typical for motor circuits and transformer inrush where nuisance tripping must be avoided. Breaking capacity at 400 V AC hits 30 kA per IEC 60947-2; at DC the same standard gives 15 kA. For UL 1077 and CSA C22.2 No. 235 installations, the AC rating is 5 kA. Approvals cover IEC / EN 60947-2 and UL 1077, so the breaker is accepted across most industrial and commercial jurisdictions. Pollution degree 3, overvoltage category III — rated for fixed installations in factory environments where conductive dust or condensation is possible. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz, so it holds up on machine-mounted sub-panels.
Integration notes
Four modular width units (72 mm) snap onto a DIN rail; mounting position is any, so vertical, horizontal, or inverted busbar feeds are fine. Combined terminals top and bottom accept copper conductors without separate neutral switching. Sealable with a lead seal — useful for revenue-metering or tamper-proof installations. Halogen-free and silicon-free construction, so it meets clean-room or coated-panel requirements where outgassing must be minimized. IP20 with connected conductors — standard for enclosed distribution boards; not rated for washdown or outdoor exposure without a secondary enclosure.