The OFKL-NXB series single-pole miniature circuit breaker is primarily used in low-voltage terminal distribution circuits to provide overcurrent protection. The device is developed and manufactured in accordance with IEC standards, and its core task is to accurately deliver overload and short-circuit protection for single-phase lines and downstream electrical equipment. When an abnormality occurs in the line, this device effectively prevents equipment damage, conductor overheating, and electrical fires, serving as a fundamental component for the safety and system reliability of terminal power distribution in residential, commercial shops, and similar locations.