✅ CHINT NB1-63H C20 Miniature Circuit Breaker – 4P, 20A, C Curve, 10kA Breaking Capacity Description (English): The CHINT NB1-63H C20 is a four-pole miniature circuit breaker (MCB) engineered for secure and efficient protection of three-phase + neutral systems. With a rated current of 20A and C curve tripping characteristics, it is suitable for medium-duty applications such as HVAC systems, mixed-load panels, and lighting with moderate inrush currents. This breaker supports a high short-circuit breaking capacity of 10kA at 400V AC, conforming to EN/IEC 60898-1 and EN/IEC 60947-2 standards, ensuring maximum reliability in both residential and industrial settings. It includes an ergonomic toggle actuator, a VisiTrip fault indicator for quick diagnosis, and a VisiSafe strip that provides clear confirmation of isolation. The unit is compact at 72mm width (8 pitch), designed for fast DIN rail installation. Designed for long service life, it offers 20,000 mechanical and 10,000 electrical operations. Rated insulation voltage is 500V with a 6kV impulse withstand voltage. Operating temperature range: -35°C to +70°C. Specifications (English): Model: NB1-63H Poles: 4P Rated Current [In]: 20A 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)