✅ CHINT NB1-63H C50 Miniature Circuit Breaker – 4P, 50A, C Curve, 10kA Breaking Capacity Description (English): The CHINT NB1-63H C50 is a 4-pole miniature circuit breaker (MCB) developed for high-capacity protection in three-phase + neutral distribution systems. With a 50A rated current and a C-curve tripping mechanism, this MCB is suited for heavy-duty loads such as industrial machinery, large HVAC units, motor control centers, and high-demand subpanels. Delivering a short-circuit breaking capacity of 10kA at 400V AC, it complies with EN/IEC 60898-1 and EN/IEC 60947-2 standards, offering robust protection for both industrial and commercial installations. The unit features a toggle-type control switch, a VisiTrip fault indicator for fast diagnosis, and a VisiSafe strip that confirms complete isolation visually. It is DIN rail mountable and fits into 8 standard modules (72mm width). Designed for durability, the breaker offers 20,000 mechanical and 10,000 electrical cycles, with a rated insulation voltage of 500V and an impulse withstand voltage of 6kV. Operating temperature range: -35°C to +70°C. Specifications (English): Model: NB1-63H Poles: 4P Rated Current [In]: 50A Curve Type: C Breaking Capacity: 10kA at 400V AC (EN/IEC 60898-1) Insulation Voltage [Ui]: 500V AC Impulse Voltage [Uimp]: 6kV Standards: EN/IEC 60898-1, EN/IEC 60947-2 Mounting: DIN rail, 8 pitch (72mm width) Protection Class: IP20 (IP40 in enclosure) Operating Temperature: -35°C to +70°C Mechanical Life: 20,000 cycles Electrical Life: 10,000 cycles Tightening Torque: 2 Nm Wire Capacity: 1–25mm² (rigid), 1–16mm² (flexible)