The C60HB350 is a 3-pole C60H miniature circuit breaker from the Schneider Electric Multi9 range, rated 50 A with a B-curve trip characteristic. It uses a thermal-magnetic trip unit and is designed for distribution applications. Breaking capacity varies by standard and voltage: 10 kA Icn at 230/400 V AC (EN 60898), and up to 30 kA Icu at 230...240 V AC (IEC 60947-2). For DC applications, it achieves 25 kA Icu at 125 V DC (2P) and 50 kA Icu at 250 V DC (4P).
The 10 kA Icn at 230/400 V AC (EN 60898) is the rated short-circuit capacity for residential/commercial distribution boards; the higher Icu values under IEC 60947-2 (up to 30 kA at 230...240 V AC) apply when the breaker is used in industrial panels with higher prospective fault current. Three protected poles cover three-phase circuits — typical for a 400 V three-phase distribution sub-feed or a three-phase resistive load.