What the D-curve and 20 A rating mean for your panel
The MGN25118 is a C60H miniature circuit breaker from the Multi9 range, rated 20 A at 50 °C with a D-curve magnetic trip of 12 x In +/- 20 %.
Breaking capacity and service continuity — the real coordination numbers
But the service breaking capacity Ics tells you what it can do repeatedly: 15 kA at 240 V (50 % of Icu), 7.5 kA at 415 V, and 5 kA at 440 V. For a distribution board downstream of a transformer with a 10 kA prospective fault current, this breaker gives you full selectivity with the upstream device. The Category A utilisation rating means it's not intended for cascading with a downstream breaker — it's the load-end device in a coordinated scheme.
Mounting and wiring — DIN-rail fit and terminal details
Standards and compliance — what the approvals cover
Isolation suitability is confirmed — the contact position indicator gives positive visual confirmation of open contacts, meeting the safety isolation requirements of IEC 60947-2. The separate earth-leakage block option (sold separately) lets you add RCD protection without swapping the breaker.