The Mersen L078808, identified by the manufacturer description 559P CP ALJB 36.250 75, is a specialist high-voltage fuse-link engineered to provide dependable protection for medium and high-voltage electrical distribution equipment. Designed for demanding industrial and utility applications, it helps safeguard transformers, switchgear and associated electrical assets against damaging overcurrent and short-circuit faults.
Manufactured by Mersen, this fuse-link delivers rapid fault interruption and current-limiting performance, reducing the thermal and mechanical stresses imposed on electrical equipment during fault conditions. Its precision-engineered construction supports reliable network operation while helping minimise costly downtime.
The fuse features a cylindrical body with an approximate size of 36 × 250 mm and is intended for installation within compatible high-voltage fuse holders and protection assemblies. Correct selection according to system voltage, current and equipment characteristics is essential for safe and effective operation.
Key Advantages
Reliable high-voltage overcurrent and short-circuit protection.
Suitable for protecting transformers, switchgear and distribution equipment.
Robust cylindrical construction for industrial applications.
Designed for use with compatible high-voltage fuse holders.
Manufactured by Mersen for dependable long-term performance.
Key Features
Mersen L078808 high-voltage fuse-link.
Manufacturer description: 559P CP ALJB 36.250 75.
Approximate fuse size: 36 × 250 mm.
Current-limiting fuse technology.
Designed for medium and high-voltage protection systems.
Suitable for compatible industrial fuse carriers.
Engineered for dependable fault interruption.
Individual replacement fuse-link.
Dependable High-Voltage Circuit Protection
High-voltage fuse-links are designed to interrupt excessive fault currents before serious damage can occur to electrical infrastructure. Their current-limiting characteristics reduce peak fault currents and help improve the overall protection of valuable electrical equipment.
The Mersen L078808 should only be installed within compatible fuse holders and selected according to the electrical characteristics of the protected installation. Installation should always be carried out by suitably qualified personnel.
Typical Applications
Medium and high-voltage switchgear.
Transformer protection.
Industrial electrical distribution systems.
Utility infrastructure.
Electrical substations.
Replacement fuse-links for compatible Mersen equipment.
Technical Specifications
Product reference
L078808
Manufacturer description
559P CP ALJB 36.250 75
Product type
High-voltage fuse-link
Fuse body
Cylindrical
Approximate dimensions
36 × 250 mm
Operating characteristic
Current limiting
Application
High-voltage circuit protection
Installation
Compatible high-voltage fuse holders
Suitable for
Industrial and utility electrical systems
Supply format
Individual fuse-link
Manufacturer
Mersen
Frequently Asked Questions
What is the Mersen L078808 used for?
The Mersen L078808 provides high-voltage overcurrent and short-circuit protection for compatible industrial and utility electrical systems.
What type of fuse is the L078808?
It is a cylindrical high-voltage fuse-link designed for use in compatible fuse holders and protection assemblies.
Where is this fuse typically installed?
The fuse is commonly installed in medium and high-voltage switchgear, transformer protection systems and industrial electrical distribution equipment.
What are the approximate dimensions?
The fuse has an approximate cylindrical body measuring 36 × 250 mm.
How should compatibility be confirmed?
Compatibility should always be verified against the equipment manufacturer's specifications, including the required voltage, current, dimensions and fuse holder configuration.
Trusted by Electrical Engineers Worldwide
Mersen high-voltage fuse-links are specified throughout industrial and utility power systems where dependable fault interruption, reliable equipment protection and long service life are essential.
Product reference
L078808
Manufacturer description
559P CP ALJB 36.250 75
Product type
High-voltage fuse-link
Fuse body
Cylindrical
Approximate dimensions
36 × 250 mm
Operating characteristic
Current limiting
Application
High-voltage circuit protection
Installation
Compatible high-voltage fuse holders
Suitable for
Industrial and utility electrical systems
Supply format
Individual fuse-link
Manufacturer
Mersen
No documents available for this product.
Delivery
We offer fast UK delivery on all stocked items. Orders placed before 3pm Monday to Friday are eligible for next-day delivery.
Standard delivery: 2–3 working days
Next-day delivery: available on in-stock items when ordered before 3pm
Express options available — contact us for details
Returns
If you need to return an item, please contact our sales team within 30 days of receipt. Items must be returned unused in their original packaging.
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
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Customers supported
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...