The Siemens 5SJ4218-7HG41 is a 2-pole SENTRON miniature circuit breaker with a C-curve trip characteristic, meaning it trips at 5 to 10 times rated current — the standard choice for motor circuits, transformers, and general inductive loads where a moderate inrush is expected without nuisance tripping. Breaking capacity is dual-rated: 10 kA per EN 60898 for residential/commercial branch circuits, and 15 kA per IEC 60947-2 for industrial panel coordination — the higher figure is what matters when you're sizing for fault-current withstand in a factory distribution board. Rated for 400 V AC and 60 V DC, this 2-module-wide (36 mm) unit snaps onto standard DIN rail in any mounting position, with a 70 mm installation depth that fits most enclosure depths without crowding the gland plate.
Mounts on standard 35 mm DIN rail per EN 60715; the 36 mm width occupies exactly two modular units, leaving predictable space for adjacent breakers or accessories in a multi-pole assembly. Ambient temperature range spans -40 °C to +75 °C, with vibration resistance to 50 m/s² at 25–150 Hz and 60 m/s² at 35 Hz — suitable for machinery-mounted panels subject to continuous vibration.