What is a fuse link?
A fuse link is an integral component of a fuse and is responsible for disconnecting the circuit when an excessive current flows through it. It is a metal wire or a conductor that is designed to melt and break the circuit when a fault occurs.
Fuse links are available in different sizes and designs to match the application requirements. They are rated or specified based on their rated current-carrying capacity, voltage rating, and breaking capacity. Fuse links are generally used in low to medium voltage applications, and they are a reliable and cost-effective means of protecting against faults.
Once a fuse link has melted, it must be replaced as it cannot be reset. Typically, a blown fuse link would indicate a fault in the circuit that must be corrected before replacing the fuse link.
What is a fuse cutout?
A fuse cutout is a disconnecting device that is used in high-voltage distribution systems to disconnect a faulty section of the network. It comprises a fuse link, operating mechanism, and supporting insulators.
Fuse cutouts are used in distribution lines to protect transformers and other expensive equipment from damage caused by faults, such as overloads and short circuits. The fuse link in the cutout operates by melting when there is an excessive current flow, thereby opening the circuit and protecting the downstream equipment.
The operating mechanism in the fuse cutout can be manual or automatic. In manual operation, the cutout is operated by a pole-mounted hook that disconnects the faulty section of the network. In automatic operation, the cutout is triggered by fault indicators or reclosers, which detect the fault and isolate the affected section of the network.
Fuse cutouts have a higher breaking capacity than fuse links, making them ideal for high-voltage applications. They are also designed to be replaced after a fault event, as the fuse link would have melted, causing the cutout to open.
Differences between fuse link and fuse cutout
1. Application: Fuse links are generally used in low to medium voltage applications, while fuse cutouts are used in high-voltage distribution systems.
2. Breaking capacity: Fuse cutouts have a higher breaking capacity than fuse links, making them ideal for high-voltage applications where high fault currents can occur.
3. Operation: Fuse links are an integral component of a fuse, while fuse cutouts comprise a fuse link, operating mechanism, and supporting insulators.
4. Replacement: Once a fuse link has melted, it must be replaced as it cannot be reset. Fuse cutouts are designed to be replaced after a fault event.
5. Cost: Fuse links are a more cost-effective means of protection compared to fuse cutouts.
In summary, both fuse links and fuse cutouts serve the same purpose of protecting electrical equipment from damage caused by faults. However, they differ in their application, breaking capacity, operation, replacement, and cost. The choice of the device to use depends on the application requirements and the level of protection needed.
