The Siemens 5SY8563-8 is a SENTRON miniature circuit breaker with a D tripping characteristic, designed for 1P+N (2-pole) operation. It interrupts fault currents up to 20 kA at 230 V AC per IEC 60947-2, and 15 kA at 60 V DC per the same standard. The UL 1077 listing gives 5 kA for North American panels. This is a current-production part — no lifecycle change on record.
What the ratings mean for fit
D-curve (10–20× In) is the correct choice for motor, transformer, or welding loads that draw a high inrush without nuisance tripping. The 20 kA interrupting rating at 230 V AC means this breaker can clear a bolted fault up to that level without welding contacts or cascading upstream — critical for selectivity in a distribution panel. At 60 V DC the rating drops to 15 kA; the UL 1077 branch-circuit recognitions sits at 5 kA. The -40 to 75 °C operating range covers cold storage and freezer environments without derating concerns, though the surrounding temperature influence table (95% RH at 55 °C, 55% at 70 °C, 35% at 75 °C) should be checked for high-humidity, high-temp installations.
Integration and mounting
The breaker occupies 2 modular width units (36 mm) on a DIN rail, with a depth of 76 mm and an installation depth of 70 mm. The quick-assembly fastening system and any-position mounting simplify panel layout. Both top and bottom terminals accept supplementary devices, and the neutral conductor is switched internally — no separate neutral bar needed. IP20 with connected conductors is standard for enclosed panels; the sealable option (lockable toggle) supports lockout/tagout procedures.
Compliance and approvals
Rated for pollution degree 3 and overvoltage category III, this breaker carries IEC/EN 60947-2 and UL 1077 approvals. It is halogen-free and silicon-free, which matters for clean-room or semiconductor fab installations where outgassing is a concern. Vibration resistance per IEC 60068-2-6 is ±1 mm at 5–25 Hz and 50 m/s² at 25–150 Hz. Mechanical service life is 10 000 operating cycles typical.