The Siemens 5SP4280-7 is a SENTRON 5SP series miniature circuit breaker — 2-pole, C-curve, rated 80 A at 400 V AC, with a 10 kA breaking capacity tested to EN 60898.
Snaps onto DIN rail or takes screw fixing — mounting position any, so you can orient it vertically or horizontally in the enclosure. The 70 mm installation depth (76 mm overall body) and 54 mm width (3 modular units) are the numbers that matter for rail fill and gland-plate clearance.
Halogen-free and silicon-free construction. Vibration resistance at 50 m/s² (25–150 Hz) and shock at 150 m/s² half-sine — it holds up in machine-mounted enclosures near rotating equipment.