What this part is and where it fits
The Siemens SENTRON 5SL5263-6CC is a 2-pole miniature circuit breaker with a B tripping characteristic, rated at 63 A for DC circuits up to 72 V. It breaks fault currents up to 10 kA. It's a current-production part (lifecycle stage: current). The 36 mm width (2 modular units) and 76 mm depth drop into any standard DIN-rail distribution board.
DC rating and what it means on site
The 72 V DC maximum is the key spec — this breaker is built for DC circuits only. The 10 kA rating at 72 V DC tells you the internal arc chamber is designed for that.
Panel fit and environmental tolerance
IP20 with connected conductors — that's the standard for enclosed distribution boards. Not a washdown part, but fine inside a weatherproof cabinet. The temperature range is wide: -40 °C to +75 °C, so it'll handle a rooftop enclosure in summer or an unheated utility room in winter. Pollution degree 2 and overvoltage category III are typical for fixed-installation residential and light commercial infrastructure. The housing is halogen-free and silicon-free, which matters if the panel is in a clean room or a zone where outgassing could contaminate optics or contacts. Installation depth is 70 mm (the can depth behind the DIN rail), so plan for at least that plus wiring bend radius. The sealable feature means you can lock the toggle in the off position for lockout/tagout — a plus for maintenance crews who need to verify isolation.
Sourcing and RFQ posture
This is a current-production Siemens SENTRON breaker, widely specified in European-origin distribution boards. Because it's active, the supply channel is the normal distribution network — no need to broker surplus or chase last-time-buy windows. We source it to order against an RFQ; availability and current pricing are confirmed at quote time. If your BOM calls for the 5SL5263-6CC, it's a straightforward line item with no lifecycle risk.