1. 0218002.TXP Substitution Conclusion From the perspective of key electrical parameters, the 0218002.TXP can serve as a substitute for the original GDG2 model. This is based on their identical ratings for current (2A), voltage (250VAC), response characteristic (slow-blow), breaking capacity (35A), and body dimensions (5×20mm), which satisfy the fundamental functional interchangeability. The differences are as follows: - Diameter Tolerance: The 0218002.TXP has a diameter of 5.20mm, compared to 5.00mm for the GDG2. This 0.2mm difference falls within the typical tolerance range for glass tube fuses. However, mechanical compatibility with the installation clips must be verified. - Parameter Transparency: The 0218002.TXP provides specified values for melting I²t (14.45) and DC cold resistance (0.0293Ω), which are not documented for the GDG2. These additional parameters offer a clearer engineering basis for predicting surge withstand energy and power dissipation. This is particularly advantageous for ensuring coordinated protection in sensitive circuits. In summary, provided the electrical performance is compatible and mechanical installation is feasible, the 0218002.TXP is a direct replacement for the GDG2. Furthermore, its documented supplementary parameters enhance the precision of circuit protection design and the ability to assess reliability.