The 278B27-3 is a rigid vinyl cover designed for Curtis CB/CFT series terminal blocks with 3 terminal positions. This self-extinguishing cover is constructed of 0.030 inch thick vinyl with a black matte finish on both sides and features spring clips for secure attachment to terminal block mounting positions. The cover can also function as a marking strip when imprinted with white ink, providing dual functionality for circuit identification and terminal protection. It is available in configurations from 1 to 26 terminals, making it suitable for a wide range of industrial electrical and electronic applications requiring terminal block protection and organization.