The MGN25115 is a 2-pole D-curve miniature circuit breaker from the Schneider Electric Multi9 C60H range, rated 10 A at 50 °C per EN/IEC 60947-2. The D-curve magnetic trip at 12 x In (±20 %) means it tolerates the inrush of motor starters and small transformers without nuisance tripping, which is exactly what you need when this breaker feeds a contactor coil or a control transformer on the same panel.
At 36 mm wide (4 x 9 mm pitches) it occupies two module spaces, so factor that into your rail fill. The toggle provides local ON/OFF indication with a contact position indicator that confirms the state even if the handle is forced — a detail that matters during panel commissioning when you need to verify isolation at a glance.
Rated operational voltage is 440 V AC, with the service breaking capacity (Ics) at 50 % of Icu across the voltage range — 15 kA at 240 V, 7.5 kA at 415 V, 5 kA at 440 V. Earth-leakage protection requires a separate block — this is the thermal-magnetic MCB only, not an RCBO.