Siemens 5SY7563-6 — 63 A B-Curve MCB for Panel Protection
The Siemens 5SY7563-6 is a 2-pole (1P+N) miniature circuit breaker from the SENTRON 5SY7 series, rated 63 A at 230 V AC with a B tripping characteristic. It breaks fault currents up to 15 kA per EN 60898 and 20 kA per IEC 60947-2, giving you the headroom to coordinate with upstream devices in a distribution board. The 36 mm width (2 MW) snaps onto the standard DIN rail via the quick-assembly system, and the IP20 terminals with combined top/bottom wiring accept conductors without special tools.
What the Ratings Mean for Your Panel
The 63 A rating at 230 V AC covers the full load current of a sub-main or a heavy branch circuit — think large lighting banks, motor control centers, or distribution feeders. The B-curve (3–5× In magnetic trip) is the standard choice for resistive and general-purpose loads; it avoids nuisance tripping from inrush on lighting or small transformers while still clearing short circuits fast. The 15 kA (EN 60898) and 20 kA (IEC 60947-2) breaking capacities mean this MCB can safely interrupt a fault up to those levels without welding its contacts or cascading damage upstream — critical for selectivity in a multi-level distribution panel. The 72 V DC rating (per IEC 60947-2) extends its use to DC control circuits or battery-backed loads, though at 15 kA DC.
Mounting and Integration
Snap-on DIN-rail mounting (quick-assembly system) with any mounting position — no derating needed for horizontal or inverted orientation. The 70 mm installation depth leaves clearance for rear-panel wiring. Combined top and bottom terminals simplify busbar or cable entry; the sealable cover option (yes) allows lockout/tagout compliance. Pollution degree 3 and overvoltage category III suit it for industrial control panels where dust and transient surges are expected.