Siemens 5SY4503-7 — SENTRON MCB for 1P+N Switched-Neutral Circuits
That matters for any circuit where you need positive isolation of both conductors on fault or maintenance disconnect, common in single-phase sub-distribution or lighting panels where the neutral must be broken. At DC (60 V nominal, 72 V max) it interrupts 15 kA per IEC 60947-2, and under UL 1077 it is listed for 5 kA at 250 V AC single-phase.
Sourcing & Lifecycle — Active Production, No LTB Signal
For a buyer freezing a BOM or stocking a spares cabinet, the active status means no forced redesign or substitute qualification is imminent. The part carries IEC 60898-1, IEC 60947-2, and UL 1077 approvals, covering installations under European, North American, and CSA jurisdictions.
DIN-Rail Fit & Panel Integration
Width is 36 mm (2 modular units), depth 76 mm, installation depth 70 mm — fits standard 35 mm DIN rail. The quick-assembly fastening system clips on without tools.
Environmental & Mechanical Endurance
Ambient temperature range from -40 °C to 75 °C, with humidity derating: max 95% RH at 55 °C, tapering to 35% at 75 °C. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz — survives typical machine-mounted panel vibration. Energy limitation class 3 — the breaker limits let-through energy to the lowest level per IEC 60898, reducing thermal stress on downstream wiring and equipment during a short-circuit event.