What this MCB is and what the ratings mean for your panel
The ABB 2CDS271103R0164 is a 2-pole miniature circuit breaker with a C tripping characteristic, rated 16 A continuous current and 440 V insulation voltage. The C-curve means it trips between 5 and 10 times rated current — designed for moderate inrush loads like small motors, transformers, and lighting circuits where a B-curve would nuisance-trip on startup, but the fault clearance is still fast enough for branch protection. Rated short-circuit breaking capacity is 10 kA per IEC 60898 (Icn) and 25 kA per IEC 60947-2 (Icu). The Icn figure governs domestic/commercial distribution boards; the higher Icu applies when the breaker is used in industrial panels per the product standard. Either way, it clears a hard fault up to that level without welding the contacts or cascading upstream. Overvoltage category III means it is rated for fixed installation downstream of the main distribution board — not for plug-in equipment. Mounts on standard DIN rail (35 mm per EN 60715). The 35 mm width (2 module spaces) fits the standard cutout in any DIN-rail enclosure. IP20 on the terminals, IP40 on the front face; suitable for clean, dry indoor panels where no washdown or dust ingress is expected.