Underwriters LaboratoriesUL 489Standard for Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures.Referenced across 4 Anvilfield field guides. Field guides that apply UL 489ElectricalElectricalAvailable fault current studyElectricalDistribution equipment guideElectricalOvercurrent protection guideElectricalUL 508A control panel and SCCR Often cited alongsideNECIEEE 1584IEEE 242NFPA 70E Compare your optionsFuses vs Circuit breakers Browse all codes and standards