Oil-Immersed Transformer Fuses: Bay-O-Net & Backup Designs
DENCO supplies Bay-O-Net fuse holders and fuse links for oil-filled distribution transformers, together with oil-submersible current-limiting backup fuses. The holder, the fault-sensing link and the backup fuse perform distinct protective functions and are selected together.
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Specifications
| Parameter | Value |
|---|---|
| Fuse-link fault sensor currents | 10, 15, 25, 40, 65, 100 and 140A |
| Melting basis | Minimum melting at 60Hz, 25°C ambient, in transformer oil without initial load |
| Backup fuse application | Oil-submersible transformer back-up fuse |
Catalog numbers
| Catalog no. | Availability | Last reviewed |
|---|---|---|
| DSF10 | Active | 2026-08-27 |
| DSF15 | Active | 2026-08-27 |
| DSF25 | Active | 2026-08-27 |
| DSF40 | Active | 2026-08-27 |
| DSF65 | Active | 2026-08-27 |
| DSF100 | Active | 2026-08-27 |
| DSF140 | Active | 2026-08-27 |
Applications
- Oil-filled distribution transformer protection
- Pad-mount and subsurface installations
Limits and boundaries
- Holder, link and backup fuse are separate components and must be matched
- Combination selection requires DENCO engineering sign-off
Standards and testing
- Designed to ANSI/IEEE C37.41-2016
Wording reflects the evidence DENCO holds. “Designed to” a standard is not the same as certified or listed to it; where a certification exists we publish the certificate number.
Technical documents
Data sheets, dimensional drawings and time-current curves for this family are available on request. Ask for the documents you need.
What we need to quote
Voltage and whether the system is AC or DC, continuous current, required interrupting rating, physical dimensions and mounting, any indicator requirement, and the standard or approval you must meet. A photograph or drawing of the existing part is usually the fastest route.
Technical review
Specifications on this page are quoted from DENCO’s product catalog. Confirm any rating against DENCO engineering before specifying.
Related
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