Siemens SENTRON 5SY7113-8CC — 13 A D-Curve MCB, 1-Pole, 25 kA IEC
The Siemens SENTRON 5SY7113-8CC is a 1-pole miniature circuit breaker rated 13 A with a D tripping characteristic, designed for 400 V AC systems and delivering a 25 kA breaking capacity per IEC 60947-2. This is the go-to MCB for motor and transformer branch circuits where high inrush currents are expected — the D-curve holds through the start-up spike without nuisance tripping. The 18 mm width (1 modular unit) snaps onto a DIN rail via the quick assembly system, and the combined screw terminals at top and bottom accept solid or stranded conductors from 0.75 to 35 mm². IP20 rating applies with connected conductors.
Selectivity & Breaking Capacity
Under UL 1077 and CSA C22.2 No. 235 the symmetrical interrupting capacity is 5 kA — a common derating for North American supplementary protector listings. The D-curve (10–20× In magnetic trip) is the right choice for motor feeders, welding equipment, or any load with a high magnetizing inrush. For DC circuits, the maximum rated voltage is 72 V.
Panel Integration
Snap-on DIN-rail mounting, 18 mm per pole. No neutral pole switching (1P only). Sealable option is available for tamper-proof installations. Rated for mechanical engineering and industrial environments per the manufacturer.