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MERSEN FUSE H 2409P BCKUP 442-78/100 D209349

MERSEN FUSE H 2409P BCKUP 442-78/100 D209349

Mersen D209349 Limitor-P high voltage DIN back-up fuse rated at 24 kV AC and 100 A with an 80 N striker for transformer protection.

SKU: D209349Alt SKU: 45DB240V100PMPN: D209349
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List Price £189.98 ex VAT
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Why Choose the Mersen D209349 High Voltage Transformer Fuse?

The Mersen D209349 is a premium high voltage DIN back-up fuse from the proven Limitor®-P range, designed to provide dependable protection for medium voltage transformers against short-circuit currents. Manufactured in accordance with IEC 60282-1, it is engineered for reliable operation within high voltage switchgear and electrical distribution systems.

Constructed using pure silver fuse elements, silver-plated copper end caps and a robust ceramic body, the D209349 delivers excellent electrical performance and long operational life. Its integrated 80 N striker enables reliable mechanical indication and operation with compatible switchgear mechanisms.

With a rated operating voltage of 24 kV AC, a rated current of 100 A and a 78 mm × 442 mm DIN fuse format, the D209349 is ideally suited for transformer protection within substations, industrial facilities, renewable energy systems and utility distribution networks.

Key Advantages

  • Designed specifically for medium voltage transformer protection.
  • 24 kV AC IEC rated voltage.
  • 100 A rated current.
  • 63 kA breaking capacity.
  • Integrated 80 N striker for compatible switchgear mechanisms.
  • Current-limiting performance helps reduce thermal and mechanical stress.
  • Pure silver fuse elements provide dependable fault interruption.
  • Robust ceramic construction for long service life.

Key Features

  • Manufacturer: Mersen
  • Series: Limitor®-P
  • Catalogue number: 45DB240V100P
  • SKU: D209349
  • Rated voltage: 24 kV AC
  • Rated current: 100 A
  • Breaking capacity: 63 kA
  • Fuse dimensions: 78 mm diameter × 442 mm length
  • Standard 80 N striker.
  • DIN VDE T4 design.
  • Clip mounting.

Reliable Protection for Medium Voltage Transformers

The Mersen Limitor®-P range has been specifically developed to protect medium voltage transformers against the damaging effects of high fault currents. Its current-limiting characteristics reduce thermal and electrodynamic stress on transformers and associated switchgear, improving system reliability and equipment life.

The D209349 is widely used within substations, industrial power distribution systems, renewable energy installations and OEM medium voltage switchgear where dependable transformer protection is essential.

Typical Applications

  • Medium voltage transformer protection.
  • Utility substations.
  • Industrial power distribution.
  • Medium voltage switchgear.
  • Renewable energy installations.
  • Electrical infrastructure projects.
  • OEM switchgear assemblies.
  • Commercial power distribution.

Technical Specifications

Manufacturer Mersen
Model D209349
Catalogue number 45DB240V100P
EAN 3605340218428
Product type High voltage DIN back-up fuse
Series Limitor®-P
Application Transformer protection
Rated voltage 24 kV AC
Rated current 100 A
Breaking capacity 63 kA
Minimum interrupting rating 430 A
Clearing I²t 125 kA²s
Cold resistance 18 mΩ
Power dissipation 400 W
Fuse size Ø78 mm × 442 mm
Mounting Clip
Design VDE T4
Striker Standard 80 N
Body material Ceramic
Fuse element Pure silver
End caps Silver-plated copper
Approximate weight 4.2 kg
Compliance IEC 60282-1, RoHS
HS Code 85351000
Device Type Fuse link
Fuse Type High voltage
Current 100 A
Voltage 24000 V

Frequently Asked Questions

What is the Mersen D209349 used for?

It is a high voltage DIN back-up fuse designed to protect medium voltage transformers against short-circuit faults.

What voltage is this fuse rated for?

The D209349 has a rated operating voltage of 24 kV AC.

What is the current rating?

This fuse has a 100 A rated current.

Does the fuse include a striker?

Yes. It incorporates a standard 80 N striker for operation with compatible medium voltage switchgear mechanisms.

Where is this fuse typically installed?

It is commonly installed within medium voltage switchgear protecting transformers in industrial facilities, substations and utility distribution networks.

Trusted for Medium Voltage Protection Worldwide

Mersen Limitor®-P high voltage fuse-links are trusted worldwide by utilities, OEMs and industrial engineers for dependable transformer protection, reliable fault interruption and long service life.

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