The Model 276C Current-Canceling Transformer monitors two of the three phases, and cancels the effect of the current signal in the third phase, which would otherwise cause a phase shift error. The Model 276C accepts input directly or from two standard current transformers (CTs), corrects for the third leg, and provides a single current output to the controller. The Model 276C is UL Recognized and CSA Certified. For use with Models 421 or 422 in 3-phase applications.. Specifications: Certifications: CSA and UL