✅ CHINT NB1-63 C50 Miniature Circuit Breaker – 4P, 50A, C Curve, 6kA Breaking Capacity Description (English): The CHINT NB1-63 C50 is a high-capacity four-pole miniature circuit breaker (MCB) designed to safeguard three-phase + neutral electrical systems in commercial and industrial environments. With a rated current of 50A and a C tripping curve, it is ideal for heavy-duty balanced loads, including industrial motors, HVAC systems, and large power distribution circuits. The breaker supports a short-circuit breaking capacity of 6kA at 400V AC (EN/IEC 60898-1) and up to 50kA in compliance with EN/IEC 60947-2, providing robust protection across all four poles from overloads and short circuits. Key features include a manual toggle actuator, VisiTrip indicator for fault detection, and VisiSafe strip for visual confirmation of full disconnection. It has a compact 72mm width (4 DIN pitches) and mounts easily on standard DIN rails. The NB1-63 C50 is engineered for longevity, with 20,000 mechanical operations and 10,000 electrical operations. It also includes 500V insulation voltage, 6kV impulse withstand voltage, and IP20/IP40 protection when mounted inside an enclosure. Specifications (English): Model: NB1-63 Poles: 4P Rated Current [In]: 50A Curve Type: C Breaking Capacity: 6kA 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, 4 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)