Single-phase power supply phase modulation switch

The invention provides a single-phase power supply phase modulation switch, and relates to the field of single-phase power supply phase modulation. The switch comprises a single-phase load, a relay, astatic contact and a three-phase circuit breaker, the single-phase load is electrically connected with the static contact through the relay, and the relay is provided with a coil electromagnetic mechanism, a movable contact and a spring mechanical mechanism, wherein the movable contact is connected with the end of the spring mechanical mechanism, and the coil electromagnetic mechanism is electrically connected with the movable contact; the static contact is arranged in a circular arc shape, wherein the static contact is connected with a single-phase load; the movable contact is a unipolar rotating structure; the three-phase circuit breaker is a three-phase four-wire leakage current protector, and the three-phase circuit breaker is hung on a static contact. The characteristics of the technical scheme are less inve