The NB1Z-63 series AC/DC Miniature Circuit Breaker (MCB) is a protection device designed for low-voltage AC and DC electrical systems. It provides reliable protection against overload and short-circuit faults. The product adopts a modular design and can be installed on standard DIN rails. It features a compact structure, convenient installation, and reliable operation. NB1Z-63 supports both AC and DC applications, including **AC 230/400V systems and DC 220V systems**. It is suitable for industrial automation, communication equipment, photovoltaic systems, DC distribution cabinets, and control systems. The series provides multiple rated current options including **1A, 2A, 3A, 4A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, and 63A**. It supports **B, C, and D tripping characteristics** to meet different load protection requirements. - **B Curve:** Suitable for lighting circuits, resistive loads, and low inrush current equipment. - **C Curve:** Suitable for general power loads, motors, and inductive loads. - **D Curve:** Suitable for high inrush current equipment such as motors and transformers. With reliable short-circuit breaking performance and long mechanical service life, NB1Z-63 improves the safety and stability of low-voltage electrical systems.