1. R1SE-0515/H2-R Substitution Analysis The R1SE-0515/H2-R is compatible with the original model in key electrical parameters (input/output voltage, power) and can be used as a direct replacement. However, two critical differences must be noted: first, its efficiency (76%) is notably lower than that of the original model (83%), leading to higher module self-heating under the same load, which may affect system thermal design and long-term reliability; second, its isolation voltage (2kV) is higher than the original (1.5kV). While this provides additional insulation safety margin, it does not represent a necessary advantage for most applications. Additionally, there is a slight difference in package dimensions (approximately 1-2mm in length and width), requiring verification of PCB mounting compatibility. If the application is thermally sensitive, a thermal assessment is recommended. If only basic isolated power supply is required and the mechanical footprint is acceptable, direct substitution is feasible.