Siemens 5SY4501-8 — 2-pole D-curve MCB, 1 A, industrial breaking capacity
The Siemens 5SY4501-8 is a 2-pole miniature circuit breaker from the SENTRON range, with a D tripping characteristic and a rated current of 1 A at 35 °C. It delivers a breaking capacity of 10 kA per EN 60898 and 35 kA per IEC 60947-2 — the higher figure applies when the breaker is used in industrial distribution per the latter standard, giving real headroom for fault-current coordination in a panel. At 400 V AC the 35 kA SCCR means it can interrupt a fault up to that level without upstream devices needing to clear it first; that matters for selectivity studies on a motor control centre or sub-distribution board. The D curve (10–20× In trip) suits loads with high inrush, like small transformers, solenoid banks, or motor starters. Rated current derates with ambient temperature: 0.95 A at 40 °C, 0.9 A at 50 °C, and 0.85 A at 60 °C — so if the panel runs hot, size up one step. The breaker is rated for pollution degree 3 and overvoltage category III, which is the standard for fixed-installation distribution in industrial environments. It mounts in any position on a DIN rail (2 modular width units, 36 mm wide), with a depth of 76 mm and an installation depth of 70 mm. The quick-assembly fastening system and combined top/bottom terminals simplify panel wiring.
Sourcing and lifecycle
The 5SY4501-8 is an active, current-production part. Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time.