1. Physical Dimensions: The XLC-25-H-MA has a length of 107.0 mm, which is 40.0 mm (approximately 27%) shorter than the 147.0 mm length of the XLC-25-H-MAS. The MA part offers higher power density, providing a significant advantage in space-constrained applications, though it may impose greater demands on internal thermal management. 2. Price: The XLC-25-H-MA is priced at $41.90, higher than the $38.42 of the XLC-25-H-MAS. This premium typically reflects increased manufacturing costs associated with achieving a more compact form factor, which may involve tighter PCB layout, potentially more efficient thermal management, or the use of higher-density components. 3. Design Optimization: With all key electrical parameters—such as input/output voltage, current, power rating, isolation, efficiency, and protection features—being identical, the smaller MA part represents a design-optimized iteration of the MAS version. The core difference lies in achieving size reduction while maintaining equivalent performance through improvements in circuit layout, component packaging, or thermal design.