DC-rated miniature circuit breaker for 220V rail
This is a Siemens 5SY5 series 1-pole MCB, order code 5SY5163-7CC12, with a C63 trip characteristic and a 220V DC rating at 10kA breaking capacity. The C63 curve means it trips between 5x and 10x rated current (315A to 630A) under short-circuit conditions — standard for motor and lighting branch circuits where inrush is moderate.
DC breaking capacity and panel fit
Rated 220V DC with a 10kA interrupting capacity — this is a DC-specific MCB, not a dual-rated AC/DC unit. The arc extinction in DC is harder than AC; the 10kA rating at 220V DC confirms it handles the sustained arc typical of DC fault currents. Single-pole DIN rail form factor snaps onto standard 35mm rail. The 1-pole width (roughly 18mm) leaves room for adjacent breakers in a multi-pole DC string or for combining with a shunt trip accessory.