1. 34BWDP31B1M1QT Substitution Conclusion This is a viable and preferred electrical upgrade substitution. Compared to the original part, the key differences are: significantly higher current/voltage ratings (5A 125V AC vs. 0.5VA 28V AC), providing greater contact current-carrying capacity and safety margin at the same operating voltage—note, however, its DC rating remains identical at 28V DC; it features an IP67 ingress protection rating, a major improvement from none, making it suitable for harsher environments; its electrical endurance is slightly lower (50k cycles vs. 60k cycles), but generally acceptable. All other critical mechanical characteristics (DPDT On-Off-On circuit, actuator type/material, solder lug terminals, 1/4-40 mounting thread) are compatible, allowing for a direct panel replacement.