The MGN61851 is a Schneider Electric Multi9 C60H-DC miniature circuit breaker — a 2-pole, 20 A, C-curve unit built for DC networks.
Breaking capacity and voltage ratings
The DC breaking capacity is specified at four voltage points: 20 kA Icu at 220 V DC, 20 kA at 250 V DC, 10 kA at 440 V DC, and 6 kA at 500 V DC. That means in a 250 V DC bus (common in telecom or solar combiner boxes), the breaker clears a 20 kA fault without external current limiting. At the higher 500 V DC level (typical in some battery banks), the interrupting capacity drops to 6 kA — still adequate for most series-string faults, but verify your available fault current against the 6 kA limit.
DIN rail integration and terminal sizing
The IP20 finger-safe front face and IP40 modular enclosure rating let it sit in a standard distribution board without additional shrouding. Padlockable toggle for lockout/tagout compliance.