The screw shell of a plug-type fuseholder should be connected to which side of the circuit?

The screw shell of a plug-type fuseholder should be connected to the load side of the circuit because it serves as a protective measure for the components downstream. When the fuse is positioned on the load side, it ensures that any faults or overloads occurring in the load equipment will interrupt the circuit. This placement is crucial for maintaining safety, as it prevents live voltage from reaching the load in the event of a blown fuse.

Connecting the fuseholder to the load side allows for the interruption of current flow to the entire load when the fuse blows, which helps to protect both the electrical system and the devices connected to it. Positioning it on the supply side would not effectively protect the load from potential overcurrent situations, as the current would still reach the load even if the fuse opened. Thus, proper connection to the load side enhances the reliability and safety of the electrical circuit.