Bureau of Indian Standards. CCUniversal Abstract. BS EN (EN, IEC) & BS EN (EN, IEC) relate to low-voltage circuit-breakers for use in household and similar installations This is a preview of IEC Ed. Click here to purchase the full version from the ANSI store Electrical accessoriesCircuit-breakers for overcurrent protection for household and similar installationsPartCircuit-breakers for AC and DC operation. IS/IEC (): Electrical accessoriesCircuit-breakers for overcurrent protection for household