The Siemens SENTRON 5SL6163-7MB is a 1-pole miniature circuit breaker (MCB) with a C tripping characteristic, rated at 63 A and a breaking capacity of 6 kA according to EN 60898. It handles single-phase AC circuits up to 250 V or multi-phase up to 440 V, and is rated for DC operation up to 72 V. The 18 mm width (1 modular unit) snaps onto a DIN rail, making it a direct panel fit for residential and infrastructure distribution boards.
What the ratings mean for the panel
The C-curve means the magnetic trip operates at 5 to 10 times rated current — suited for moderate inrush loads like small motors, fluorescent lighting banks, or transformer-fed circuits where a B-curve would nuisance-trip. At 63 A rated current, this breaker holds a 63 A continuous load and clears a short-circuit fault up to 6 kA per EN 60898. That 6 kA is the prospective short-circuit current the breaker can safely interrupt at 400 V AC — adequate for most residential and light commercial sub-distribution boards, but verify the available fault current at the installation point if feeding from a high-capacity transformer. Power dissipation is 4.4 W per pole at rated current in hot operating state. In a multi-pole assembly or a densely packed enclosure, that heat must be factored into the thermal budget — especially if the board is sealed or in a high-ambient environment. The breaker is rated for ambient temperatures from -40 °C to 75 °C, with a degree of pollution 2 and overvoltage category III, placing it in standard indoor panel environments.
DIN-rail fit and panel integration
The 18 mm width occupies one modular unit on a standard DIN rail. Depth is 76 mm, height 90 mm, with an installation depth of 70 mm behind the panel face. Mounting position is any — horizontal, vertical, or flat — which simplifies layout in tight enclosures. The IP20 rating applies with connected conductors; the breaker is sealable for tamper-proofing in metered or public-access boards. Supplementary devices (auxiliary switches, shunt trips, alarm contacts) can be snapped onto the right side.