Transformer Fuse

Transformer components

Transformerfuse

Configuration-led support for transformer fuse protection paths. Start with the transformer application, protection approach, mounting arrangement, and available project evidence before confirming a fuse configuration.

Transparent transformer current-limiting fuse link product cutout
Transformer fuse engineering selection

Transformer fuse typesfor protection coordination.

Select the transformer fuse family by protection duty and equipment interface, then open the matching card to verify published technical parameters and dimensional drawings. Final ratings, fuse-link selection, and mounting clearances remain subject to the project specification.

Current-limiting backup fuse for oil-immersed transformers
Transformer fuse product

Current-limiting backup fuse for oil-immersed transformers

For transformer fault-protection schemes that require published current ratings, breaking capacity, dimensional data, and mounting-reference drawings.

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Bay-O-Net fuse holder for distribution transformers
Transformer fuse product

Bay-O-Net fuse holder for distribution transformers

For sidewall-mounted transformer fuse assemblies where the holder interface, voltage class, mounting arrangement, and drawing dimensions must be reviewed together.

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High-voltage full-range transformer fuse
Transformer fuse product

High-voltage full-range transformer fuse

For transformer protection coordination where a full-range fuse link, dimensional drawing, and equipment interface must be checked before selection.

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SMRS dual-sensing fuse link for transformer protection
Transformer fuse product

SMRS dual-sensing fuse link for transformer protection

For distribution transformer backup-protection arrangements that require the sensing fuse-link data and dimensional drawing to be reviewed as one assembly.

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Bay-O-Net fuse holder drip tray / drip guard
Transformer fuse product

Bay-O-Net fuse holder drip tray / drip guard

For transformer fuse-holder installations where a drip guard and the published part identification must match the selected mounting arrangement.

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Bay-O-Net fuse isolation link
Transformer fuse product

Bay-O-Net fuse isolation link

For transformer fuse-holder systems that need an isolation-link reference and dimensional drawing checked against the service and maintenance arrangement.

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Engineering data review

Current-limiting backup fuse for oil-immersed transformers

Use the published electrical or identification data together with the dimensional drawing to verify transformer protection duty, holder interface, mounting clearances, and project fit before specifying a final fuse assembly.

Published technical parameters

TypeRated Current (A)A (Inch/mm)B (Inch/mm)MAφCBreaking Current
XRNT5-15.520, 25, 31.5, 409.76 / 2488.5 / 216M6φ53– – 50kA –
50, 63, 80, 100, 12514.0 / 35612.76 / 324M6φ53
150, 17515.94 / 40514.69 / 373M6φ53
200, 25019.45 / 49418.19 / 462M10φ76
XRNT5-2531523.62 / 60022.32 / 1567M10φ76– 50kA – –
20, 25, 31.5, 4019.45 / 49418.19 / 462M10φ76
50, 63, 80, 100, 12513.0 / 35612.76 / 324M6φ53
125, 150, 175, 20023.62 / 60022.32 / 1567M10φ76
XRNT5-40.510, 2022.68 / 57621.38 / 543M10φ76– 31.5kA –
31.5, 40, 50, 6323.86 / 60622.56 / 573M10φ76
80, 100, 125, 150, 16527.36 / 69525.79 / 655M10φ76

Technical drawings and dimensions

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Engineering data review

Bay-O-Net fuse holder for distribution transformers

Use the published electrical or identification data together with the dimensional drawing to verify transformer protection duty, holder interface, mounting clearances, and project fit before specifying a final fuse assembly.

Published technical parameters

FeatureDescription
PurposeOver-current protection for oil transformers.
Protection MechanismDual sensing (current + oil temperature) via fuse wire.
Compatible Fuse TypesCurrent sensing, dual sensing, dual element, ELSP current-limiting backup fuse.
ApplicationHigh-voltage power systems (50Hz AC).
Rated Voltage15.5kV (standard).
Current RatingUp to 140A.
Required CombinationMust be paired with Magn X Interrupter (ELSP Backup Fuse) for full protection (overload + short circuit).
Key BenefitsSafe, highly efficient, responsive to current and oil temperature changes.
Ratings and Characteristics 23kV AssemblyRatings and Characteristics 38kV Assembly
Electrical RatingskVElectrical RatingskV
BIL and Full Wave Crest150BIL and Full Wave Crest200
60Hz,AC,1minuter withstand5060Hz,AC,1minuter withstand70
Max Single-Phase Interrupting Ratings in Mineral OilkVMax Single-Phase Interrupting RatingskV

Technical drawings and dimensions

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Engineering data review

High-voltage full-range transformer fuse

Use the published electrical or identification data together with the dimensional drawing to verify transformer protection duty, holder interface, mounting clearances, and project fit before specifying a final fuse assembly.

Published technical parameters

OCR transcription from the published parameter reference. The source uses the same column name for the two current fields; the headings below distinguish the maximum rating from the listed rating series for engineering review.

ModelRated voltage (kV)Maximum fuse rated current (A)Available fuse current ratings (A)Fuse diameter (mm)Rated breaking current (kA)
XRNT15.512520, 25, 31.5, 40, 50, 63, 80, 100, 125φ6550
XRNT15.5250160, 200, 250φ8650
XRNT248020, 25, 31.5, 40, 50, 63, 80φ6550
XRNT24160100, 125, 160φ8650
XRNT40.56320, 25, 31.5; 40, 50, 63φ6531.5
XRNT40.58080φ7631.5
XRNT40.512580, 100, 125, 160φ8631.5

Overall dimensions and installation dimensions (mm)

ModelFuse current rating (A)ABCDEFGHIJK
XRNT-15.520–63645258580357305651161021569198
XRNT-15.580–125860473795572520651161021569198
XRNT-15.5160–20089547379557252086130128170106118
XRNT-15.525089047379557252086130128170106118
XRNT-2420–31.5885395817494442651161021569198
XRNT-2440–8011206301052729677651161021569198
XRNT-24100–1601300630120072967786130128170106118
XRNT-40.520–6312656301200729677651161021569198
XRNT-40.580–1001300630120072967786130125170106118
XRNT-40.5125–1601400730130082977786130128170106118

Technical drawings and dimensions

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Engineering data review

SMRS dual-sensing fuse link for transformer protection

Use the published electrical or identification data together with the dimensional drawing to verify transformer protection duty, holder interface, mounting clearances, and project fit before specifying a final fuse assembly.

Published technical parameters

ParameterSpecification
StandardIEC 60282-1, DIN 43625
Rated Voltage12kV, 24kV (or 7.2kV, 15.5kV, 38kV)
Rated Current6A, 10A, 16A, 20A, 25A, 31.5A, 40A, 50A, 63A, 80A, 100A, 125A
Breaking Capacity50kA / 63kA (Symmetrical)
Sensing TypeDual (Low current overload + High current short circuit)
FeaturesStriker pin, Current limiting, High interrupting rating
ApplicationDistribution transformer (Oil/ Dry), Pad-mounted transformer

Technical drawings and dimensions

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Engineering data review

Bay-O-Net fuse holder drip tray / drip guard

Use the published electrical or identification data together with the dimensional drawing to verify transformer protection duty, holder interface, mounting clearances, and project fit before specifying a final fuse assembly.

Published technical parameters

DescriptionModel
Bay-O-Net Fuse Holder Drip Tray (Drip Guard)1C10880H01
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Engineering data review

Use the published electrical or identification data together with the dimensional drawing to verify transformer protection duty, holder interface, mounting clearances, and project fit before specifying a final fuse assembly.

Technical drawings and dimensions

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Transformer fuse application engineering

Transformer fuse protectionfor distribution transformers.

Specify transformer fuse protection from the transformer fault duty, voltage class, installation type, and required protection coordination. Use the published product data to match the fuse link, Bay-O-Net holder, and isolation accessories to the transformer design—not to select a fuse by current rating alone.

Engineering review starts here

Confirm the transformer protection system—not just the fuse rating.

  1. Backup-fuse coordination

    For a current-limiting backup fuse arrangement, coordinate the fuse link with the low-current primary protection device and the transformer short-circuit duty.

  2. Full-range transformer fuse

    For a full-range fuse link, verify the published voltage and current range, breaking capability, dimensions, and transformer installation conditions.

  3. Bay-O-Net service interface

    For oil-immersed distribution transformer service, review holder mounting, fuse-link replacement, isolation-link position, and drip protection together.

Open transformer fuse technical data
Transformer fuse factory

From factoryto delivery.

Bring the confirmed transformer protection duty, selected fuse family, drawings, quantity, and delivery basis into one controlled handoff. The source-backed references below show the production, testing, finished-product, and packing stages available for Transformer Fuse project review.

Suvell factory exterior
FactoryFactory reference
Fuse-link production operation
ProductionProduction reference
Fuse-link testing reference
TestingTesting reference
Finished transformer fuse stock
Finished productFinished-product reference
Transformer fuse packing reference
PackingPacking reference
  1. 01

    Technical confirmation

    Confirm the transformer duty, selected fuse family, drawings, and inquiry inputs.

  2. 02

    Production planning

    Align the approved configuration, quantity, and delivery basis before release.

  3. 03

    Production and testing

    Coordinate production reference and applicable inspection points for the selected configuration.

  4. 04

    Packing preparation

    Confirm product protection, package format, identification, and shipping requirements.

  5. 05

    Document handoff

    Prepare the agreed technical, commercial, and delivery documentation for the order.

  6. 06

    Dispatch coordination

    Confirm destination, logistics handoff, and final delivery instructions before shipment.

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Transformer fuse engineering FAQ

Transformer fuseselection FAQ.

Use the applicable product family data, dimensional drawing, and transformer project inputs together. Final ratings, protection coordination, and mounting suitability are confirmed for the selected transformer configuration.

What information is needed to select a transformer fuse?

Provide the transformer application, voltage class, protection duty, available fault or coordination information, mounting arrangement, conductor connection, quantity, and any drawing, nameplate, or installation photos available for review.

How do backup fuses, full-range fuses, and Bay-O-Net holders fit into selection?

Review the required protection arrangement first, then compare the published fuse-link, holder, and service-interface data against the transformer installation. The final combination is confirmed with the protection coordination and project drawing.

Which drawings and dimensional data should be checked before release?

Check the matched product drawing, mounting envelope, terminal or holder interface, clearance, replacement access, and the applicable connection arrangement. Use the technical drawing in the relevant product Modal as the starting reference for project review.

Can a transformer fuse configuration be customized for a project?

Project-specific selection may require confirmation of the fuse family, rating basis, holder or link interface, mounting arrangement, marking, quantity, documentation, and delivery requirements. Submit the transformer and installation inputs for the appropriate review.

Transformer fuse engineering inquiry

Requesttransformer fuseengineering review.

Share the transformer duty and available project evidence so the review can align the fuse family, protection coordination, holder or link interface, and drawing-release inputs before quotation.

Include with your inquiry
Transformer voltage class and applicationProtection path and coordination basisFuse family or existing part referenceRequired current or fault-duty informationHolder, Bay-O-Net, or mounting interfaceDrawings, nameplate, quantity, and destination
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Request a fuse review

Tell us the transformer application, protection path, selected fuse family, mounting arrangement, quantity, destination, and available project documentation.

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