PB series products are a new generation of low-cost, high-reliability solutions developed for high-current energy storage needs. The product is integrally formed with high-performance engineering plastics, with modular design ideas. The same specification provides a variety of connection methods and copper bar sizes to meet different customer needs, while minimizing product volume and cost. The patented design of the protective cover is fastened together with the main body, as well as the tool-unlocked buckle structure, so that the cover will not be lost or damaged when the copper bar is connected, which further ensures the safety of the connection.