Eaton Cooper Power Series Dual-Sensitive Bay-O-Net Fuse Link 4000358C05B / 4000358C10B for Dual-Fuse Transformer Protection

Product Specifications

Product Name: Eaton Cooper Power Series Dual-Sensitive Bay-O-Net Fuse Link

Rated Voltage: 8.3kV, 15.5kV, 23.0kV Class

Rated Current: 5A, 8A, 15A, 25A, 50A, 65A, 90A, 110A, 135A, 140A

Type: Dual-Sensitive (Off-Load/Off-Circuit) Plug-in Fuse Link

Color: White / Silver

Available Models & Standard Ratings

• 5A Current Link: 4000358C03B (Individual packaging)
• 8A Current Link: 4000358C05B (Individual packaging)
• 15A Current Link: 4000358C08B (Individual packaging)
• 25A Current Link: 4000358C10B (Individual packaging)
• 50A Current Link: 4000358C12B (Individual packaging)
• 65A Current Link: 4000358C14B (Individual packaging)
• 90A Current Link: 4000358C16B (Individual packaging)
• 110A Current Link: 4000358C17B (Individual packaging)
• 135A Current Link: 4000358C18B (Individual packaging)
• 140A Current Link: 4000358C19B (Individual packaging)
• Bulk Packing Option: All models available in 50-piece bag configuration by substituting suffix “B” with “M” (e.g., 4000358C10M).

Material & Design Characteristics

• Inner Core Tubing: Genuine TEFLON® tube providing a track-resistant bore to safely withstand full-rated voltage after fuse operation.
• Contacts System: High-conductivity silver-plated brass end contacts ensuring stable and cool electrical connection with the holder.
• Dual-Element Design: Incorporates a low-temperature eutectic element ribbon coupled with a specialized current-responsive element for dual thermal/current protection.

Product Functions

1. Dual-Sensing Thermal & Overcurrent Protection: Uniquely senses both high internal transformer oil temperature (above 140°C) and excessive continuous overload currents, effectively protecting the transformer from thermal runaway and winding damage.

2. Two-Fuse System Protection Scheme: Specifically engineered to operate in series with an Eaton Cooper ELSP backup current-limiting fuse. The Bay-O-Net link handles low-current fault and overload clearing, while the backup fuse isolates high-current faults.

3. Advanced Secondary Fault Clearing: Highly effective at sensing and isolating distant secondary low-voltage faults or internal winding overloads before catastrophic tank pressure develops.

Key Features

1. Track-Free Teflon® Bore: Features a high-integrity inner Teflon® tube that eliminates carbon tracking inside the cartridge, allowing it to withstand full network voltage after fuse blowout.

2. Dual Response Mechanism: Responds to both electrical current levels and ambient transformer oil temperature, protecting single-phase conventional/self-protected units (up to 500 kVA) and three-phase units (up to 1500 kVA).

3. Tool-Free Hotstick Servicing: Simplifies field maintenance. Operators can safely withdraw the entire fuse cartridge holder from non-pressurized apparatus and swap the link using a standard hotstick.

4. Robust Interrupting Capacity: Provides exceptional single-phase interrupting ratings up to 3,500A rms symmetrical at 8.3kV and 15.5kV, and up to 1,000A rms symmetrical at 23.0kV under transformer fluid environments.

Technical Parameter Specifications

• Max. Current Rating Range: 5A to 140A continuous capacity
• Max. Voltage Application: 23.0kV maximum system class
• Model Numbers: 4000358C03 to 4000358C19
• Primary Applications: Pad-mounted Transformers, Subsurface Vault Installations, Distribution Substations requiring combined thermal/overload monitoring.
• Standard Compliance: Fully compliant with standard IEEE overcurrent protection and transformer loading guide standards.