What is one main benefit of having S-fuses?

Having S-fuses, also known as dual-element fuses, provides significant advantages, particularly their ability to prevent over-fusing. These fuses are designed to protect electrical circuits by interrupting the flow of current in case of overloads or short circuits, but they are specifically manufactured to handle temporary inrush currents—such as those that occur when motors start.

The S-fuse's design allows it to withstand short-term overloads without blowing, which ensures that the circuit remains protected during normal operational conditions. This is critical in preventing false blow conditions where a fuse could unnecessarily interrupt service due to momentary spikes in current that do not represent a true fault. This characteristic effectively enhances the reliability of electrical systems, thus reducing the need for frequent replacements and maintenance.

Other options do not capture this principal benefit. While some types of fuses can be cheaper, easier to install, or available in larger sizes, these factors are secondary to the critical role that S-fuses serve in preventing over-fusing and maintaining circuit integrity.