The MGN25132 is a Schneider Electric C60H miniature circuit breaker from the Multi9 range, a 3-pole (3P) thermal-magnetic unit rated 20 A at 50 °C per EN/IEC 60947-2. The D curve fires at 12 x In ±20 %. The service breaking capacity (Ics) is 50 % of Icu: 15 kA at 240 V, 7.5 kA at 415 V, 5 kA at 440 V. That's the level the breaker can still be used after clearing a fault — below that threshold it's still functional, above it you replace it. For a panel that sees occasional faults, that's a practical number to know for your spares planning.
The 3-pole body takes 6 x 9 mm pitches (54 mm wide), 81 mm tall, 73 mm deep. That's a standard Multi9 footprint — it'll slot into any DIN-rail enclosure or panel without re-drilling. The toggle gives a clear ON/OFF indication and a contact position indicator confirms the state even if the toggle is forced.
Earth-leakage protection requires a separate block (not integrated).