That dual-standard stamp means it's accepted in panels destined for European and North American lines alike — one part number for a global BOM, no need to swap breakers at the shipping dock. It's a C-curve device, so it handles moderate inrush without nuisance tripping — think motor starters, small transformers, or banks of LED drivers on a conveyor line. The 30 kA interrupting rating at 400 V AC gives you headroom for high-fault panels; the DC side is rated 15 kA at 60 V, fine for control bus protection in the same cabinet. With IP20 once conductors are connected, it's for inside the enclosure — not out on the washdown floor.
The UL 1077 supplementary-protector rating at 5 kA is a different standard (lower fault current, typically used downstream of a branch-circuit OCPD), but having both means the same part passes inspection in Chicago or Frankfurt. Three poles switch all three phases. No neutral pole. Vibration resistance tested to IEC 60068-2-6: ±1 mm at 5 to 25 Hz, 50 m/s² at 25 to 150 Hz. That's enough for most industrial machinery — pumps, compressors, conveyors on the plant floor. Not a marine or rail shock spec, but solid for a fixed panel in a factory.