Small distribution boxes have been widely used in many fields such as industry, commerce, civil and infrastructure construction due to their advantages of small size, convenient installation, safety and reliability, economical and practical, beautiful and neat appearance, as well as their functions of power distribution, electrical protection, control and monitoring. It can not only meet the needs of power distribution and control in different places, but also effectively improve the safety and stability of the power system, bringing many conveniences and values to customers. With the continuous development of electrical equipment today, small distribution boxes will continue to play an important role and provide more reliable and efficient power guarantee for people's production and life.