Yuco YC-40-2B Miniature Din Rail Circuit Breaker B Curve 277/480V 50/60Hz 2 Pole (40 Amp) 3rd Party Certifier. UL1077 CSA C22.2. Tested & Certified by TUV Rheinland. Record # 17048084-001. B Curve 2 Pole 40 Amp 277/480V