Leave Your Message
Bay-O-Net Fuse Link-Transformer Protection Devices

Bay-O-Net Fuse

Bay-O-Net Fuse Link-Transformer Protection Devices

The Cooper Power Systems Current Sensing Bay-O-Net fuse link is used in Cooper Power Systems Bay-O-Net fuse assemblies to protect distribution apparatus from damaging currents and to protect distribution systems from failed apparatus. They are used on single-phase conventional and self-protected distribution transformers and other apparatus rated through 500 kVA, and on three-phase equipment through 1500 kVA.

A Bay-O-Net fuse is ideal for use in a two-fuse protection scheme with a current-limiting backup fuse. In this arrangement, secondary faults and overload currents are cleared by the Bay-O-Net fuse, and high level faults are cleared by the current-limiting fuse. The two fuses are connected in series, and are coordinated so that the current-limiting fuse operates only upon internal equipment failure. If the Bay-O-Net fuse will not be used in series with a current-limiting fuse, an isolation link is required. Bay-O-Net fuses are comparable in cost to internal cartridge fuses but have the advantages of being field-replaceable. Bay-O-Net fuses can easily be coordinated with upstream devices.


    Bayonet fuses are widely used in padmount transformers and are considered the industry standard for transformer fusing. These fuses are a type of expulsion fuse, which is commonly used in electrical distribution systems on utility poles and inside transformers.
    Expulsion fuses, including bayonet fuses, have a thin, fusible element that melts when subjected to high current or temperatures. When the element melts, it creates an arc inside the fuse housing. The arc heat interacts with a special lining in the housing, generating gasses that fill the housing and quickly extinguish the arc, and prevent current flow.
    Bayonet fuses are designed to handle most common electrical distribution system issues, such as overheating, overloading, secondary faults, and low level short circuits which might damage the transformer depending on their magnitude and duration. The cause of these issues can typically be identified, and resolved by experienced electrical workers, and (if quickly cleared by the bayonets) do not often cause lasting damage. Once the issue is resolved, the bayonet fuse is replaced, and the transformer can be energized.