1. GDG2 Substitution Conclusion From the perspective of mounting compatibility and basic electrical parameters, the GDG2 can directly replace the GSC2. However, its breaking capacity is the key limiting factor: the GDG2's breaking capacity (35A) is significantly lower than that of the GSC2 (100A). The GDG2 can only safely interrupt a maximum fault current of 35A. If the potential short-circuit current in the actual circuit exceeds this value (e.g., near the power input or inductive loads), the GDG2 may fail to reliably extinguish the arc during a fault. This could lead to sustained arcing, enclosure rupture, and potential safety hazards. The feasibility of substitution entirely depends on the maximum prospective fault current in the application scenario. If it is confirmed that the circuit's short-circuit current remains consistently below 35A, substitution is acceptable. If the fault current could be higher or is unknown, the original specification (GSC2) must be used to ensure system safety.