The Siemens SENTRON 5SQ2170-0KA63 is a 1-pole miniature circuit breaker (MCB) rated for 63 A at 240 V AC, 50 Hz, with a C tripping characteristic and a 3 kA breaking capacity certified to both EN 60898 and IEC 60947-2. This is a current-production part, still in the active catalog.
The 63 A rating on a single pole means this breaker handles the full load current on one phase — typical for a high-draw single-phase branch circuit or a large lighting/general-purpose load in a 240 V AC distribution board.
Panel integration
Occupies 1 width unit (roughly 18 mm) on a DIN rail. Installation depth is 55 mm, which fits standard 63 A MCB enclosures. Overvoltage category 3 and energy limiting class 3 are standard for this class of MCB.