Yuco YC-20-1D Miniature Din Rail Circuit Breaker D Curve 120/277V 50/60Hz 1 Pole (20 Amp) 3rd Party Certifier. UL1077 CSA C22.2. Tested & Certified by TUV Rheinland. Record # 17048084-001. D Curve 1 Pole 20 Amp 120/277V