The Schneider Electric MGN61868 is a Multi9 C60H-DC miniature circuit-breaker — a 1-pole, thermal-magnetic unit rated 20 A at 50 °C, with a K-curve trip characteristic designed specifically for DC networks. The 73 mm depth keeps the breaker within typical enclosure clearances — no need to rework the gland plate or switch to a deeper box. The DC rating is the headline: it carries 20 A continuous and interrupts faults at 20 kA Icu at 110 V DC, 10 kA Icu at 220 V DC, and 6 kA Icu at 250 V DC, all per EN/IEC 60947-2. That means it can clear a dead short on a 220 V DC bus — common in solar combiner boxes, battery banks, and DC motor drives — without welding its contacts shut. The K curve (12 x In magnetic trip, +/-20%) is faster than a B or C curve on moderate overloads, which suits inductive DC loads like contactor coils and solenoids that draw a brief inrush.
Integration notes — DIN rail, terminals, and environment
Clip-on mounting to a standard DIN rail. Strip length is 14 mm; tighten to 2.5 N·m. Mechanical durability is 20,000 cycles; electrical durability is 3,000 cycles at L/R = 2 ms (typical for DC loads with some inductance).