The Siemens SENTRON 5SL5263-7RC is a 2-pole miniature circuit breaker rated 63 A with a C tripping characteristic, designed specifically for 440 V DC circuits. It occupies 2 modular width units (36 mm) on a DIN rail, making it a compact fit for DC distribution panels in residential and infrastructure applications. The C-curve means it trips between 5 and 10 times rated current — suited for loads with moderate inrush, like lighting banks or small DC motor drives, where you need to ride through the start surge without nuisance tripping.
DC rating and what it means on the panel
Rated 440 V DC with a breaking capacity of 10 kA, this breaker handles the arc extinction challenge DC presents — no zero-crossing to naturally quench the arc. The 2-pole design switches both lines, which is standard practice for DC circuits to ensure positive isolation. Overvoltage category III and pollution degree 2 mean it's rated for fixed installations inside a building's distribution board, not for outdoor or wet locations. IP20 with connected conductors is the norm for panel-mount MCBs; the enclosure provides the environmental seal.
Footprint and panel fit
At 36 mm wide (2 MW), 76 mm deep, and 90 mm tall, it snaps onto a standard DIN rail with any mounting position permitted. Installation depth is 70 mm. The sealable design allows the panel builder to lock the toggle position after commissioning — useful for circuits that must not be switched off inadvertently. Halogen-free and silicon-free construction matters for environments sensitive to outgassing, such as clean rooms or transit applications.