what must be used in conjunction with type s plug fuses when they are installed in a fuse holder?

Type S plug fuses must be used in conjunction with a Type S adapter when installed in a fuse holder. The Type S adapter screws into the Edison base socket of the fuse holder and ensures that only the correct amperage fuse can be installed, providing proper and safe operation. This adapter is designed to prevent the installation of incorrect fuses and to meet electrical code requirements for tamper-resistant protection in fuse systems.