The MGN60509 is a C60N miniature circuit-breaker from the Multi9 range, rated 4 A at 50 °C with a D tripping curve (12 x In magnetic limit). Breaking capacity is 10 kA Icu at 240 V AC phase-to-neutral, with a service breaking capacity Ics of 7.5 kA (75 %) at the same voltage — enough for most distribution sub-panels in commercial or light industrial installations. At 415 V AC the Icu drops to 3 kA, so this is a 240 V line-to-neutral part, not a 400 V three-phase breaker.
IP20 finger-safe terminals — intended for enclosed panel use, not washdown. Rated for pollution degree 3 (conductive or dry non-conductive pollution), operating ambient -30 to 70 °C, storage -40 to 80 °C. Electrical endurance 10,000 cycles, mechanical 20,000 cycles. Local ON/OFF indication and contact position indicator standard.