The Schneider Electric MGN61857 is a 2-pole DC miniature circuit-breaker from the Multi9 C60H-DC series, rated 63 A at 50 °C with a C-curve trip characteristic. It is designed for DC distribution networks and clips onto a DIN rail for panel integration. The breaking capacity reaches 20 kA Icu at 250 V DC, dropping to 10 kA at 440 V DC and 6 kA at 500 V DC, per EN/IEC 60947-2. This makes it suitable for protecting DC bus lines, battery banks, and DC motor circuits where high interrupting capability is required.
DC Ratings and Breaking Capacity
The rated operational voltage spans 220 V, 250 V, 440 V, and 500 V DC, with the rated insulation voltage at 500 V DC. The magnetic tripping limit is set at 8.5 x In ±20% DC, so a 63 A breaker trips instantaneously on a DC fault of roughly 536 A or more.
The breaker occupies 4 x 9 mm pitches (36 mm width) on a DIN rail, with a depth of 73 mm and height of 81 mm. Clip-on mounting allows tool-less installation; the toggle handle provides local ON/OFF indication and a contact position indicator confirms the state. The tunnel-type terminals accept 1 to 35 mm² rigid stranded (AWG 18 to AWG 2) on top or bottom, with a tightening torque of 3.5 N.m.