FAQs:Power Controls

摘要

Q: How does an SCR power controller work? A: Phase-angle controllers work like a light dimmer. The load voltage is varied by varying the time within each electrical half-cycle during which voltage is applied to the load. By contrast, zero-cross is analogous to a very fast contactor that "makes" only at the beginning of each electrical half-cycle and always "breaks" at the end of the electrical half-cycle.