1. Contact Configuration & Load Capacity: The V23026 is an SPDT (Single Pole Double Throw) relay with a contact rating of 1A / 150VAC. In contrast, the V23079 is a DPDT (Double Pole Double Throw) type rated for 2A / 250VAC. While the V23079 can control two independent circuits and handle higher power, using it in a design originally requiring only single-circuit switching would be inefficient, wasting resources and occupying more PCB space. 2. Drive Requirements: The coil resistance of the V23079 (578Ω) is significantly lower than that of the V23026 (1.2kΩ), resulting in a drive current requirement (approx. 15.6mA) roughly double that of the latter. Direct substitution could overload the existing driver circuit (e.g., a transistor or logic output) or prevent reliable pull-in. 3. Dynamic Performance: The operate/release time of the V23079 (4ms) is twice that of the V23026 (2ms). In applications sensitive to timing or high-frequency switching (such as test equipment or high-speed switching circuits), this difference may degrade system response speed or introduce logic errors. 4. Contact Material: The V23026 utilizes a PdNi+Rh+Au composite plating, making it suitable for low-level, dry-circuit, or high-reliability signal switching. The V23079 employs AgNi+Au contacts, which are better suited for medium-current power loads but may not be optimal for extremely low signal levels. This difference directly impacts contact resistance stability and electrical lifespan.