This post Can I Use a 1-Phase Breaker on a 3-Phase Supply & Vice Versa? appeared first on ELECTRICAL TECHNOLOGY. Is It Possible to Use a Single-Phase Breaker in a Three-Phase System, and a Three-Phase Breaker in a Single-Phase System? We frequently receive unusual questions and ideas related to DIY electrical wiring installations in both residential and commercial settings. For example, people often ask whether a DC breaker can be used on an AC circuit … Visit the Can I Use a 1-Phase Breake...