Which type of small electrical distribution box is better in China

In most Chinese DIN rail boxes, the real constraint is the horizontal rail space. They're only 18mm wide—the same as a standard 1P breaker—but they provide full leakage protection. Modern distribution boxes from China are engineered to house the same (or better) electrical capacity in a package that's 30-40% smaller than traditional models. How? Through smart engineering: modular components, slimline casings, and optimized internal layouts that reduce wasted space between. American, European, and Chinese box-type substations represent distinctly different philosophies in the realm of power distribution. These varied approaches are shaped by differing urban densities, environmental priorities...