Type S fuse adapters are designed so that they cannot be removed once inserted into what?

Type S fuse adapters are specifically designed to enhance safety and prevent the use of inappropriate fuses in a circuit. When inserted into a fuse holder, these adapters provide a mechanism that allows only Type S fuses to be used, thereby reducing the risk of overloading circuits or creating hazardous conditions due to incorrect fusing. The design of the Type S adapter ensures that once it is inserted into the fuse holder, it cannot be easily removed, which serves to enforce proper circuit protection and compliance with electrical codes. This is particularly important in residential and commercial electrical installations, where safety and reliability are paramount.