MGN25133 C60H MCB, 3P D-curve 25A, 30kA Icu

The Schneider Electric MGN25133 is a C60H miniature circuit breaker from the Multi9 range, a 3-pole thermal-magnetic unit with a D-curve and a 25 A rating at 50 °C per EN/IEC 60947-2. Rated operational voltage is 440 V AC, with a breaking capacity of 30 kA Icu at 240 V AC phase-to-phase and 15 kA Icu at 415 V AC — that's the maximum fault current it can safely interrupt without welding its contacts or rupturing the case. Service breaking capacity Ics is 50 % of Icu at each voltage level — 15 kA at 240 V, 7.5 kA at 415 V, 5 kA at 440 V — meaning after one fault at that level the breaker is still functional enough to hold the line until you swap it out.