MERSEN FUSE 6,9 URD 31 EF 0550 6,9URD31EF0550

MERSEN FUSE 6,9 URD 31 EF 0550 6,9URD31EF0550

High-speed fuse designed for semiconductor protection with a robust ceramic square body, striker indication, and open slot blades for bolted mounting. Rated 550A, 690VAC IEC, 700VAC UL.

SKU: J300043Alt SKU: PC31UD69V550EFMPN: J300043
Price
List Price £175.21 ex VAT
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£175.21
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Sold in packs of 3

£175.21

Why Choose the Mersen J300043 Industrial Circuit Protection Component?

The Mersen J300043 is a professional industrial circuit protection component intended for use in compatible electrical power distribution, control and equipment protection systems. Manufactured by Mersen, it is suitable for maintenance, replacement and OEM applications where dependable electrical protection and accurate component selection are essential.

Mersen manufactures specialist fuses, fuse holders and associated protection products for industrial machinery, power conversion systems, switchgear and electrical infrastructure. The unique J300043 manufacturer part number enables engineers, panel builders and procurement teams to identify the required component when maintaining or repairing compatible equipment.

Before ordering or installing the J300043, users should verify its precise product function, electrical ratings, dimensions, terminal arrangement and compatibility against the existing component or official Mersen documentation. Correct specification matching is essential for maintaining the intended protection performance and safe operation of the electrical installation.

Key Advantages

  • Genuine Mersen industrial electrical protection component.
  • Clearly identified by manufacturer part number J300043.
  • Suitable for maintenance, repair, replacement and OEM requirements.
  • Designed for use in compatible industrial electrical assemblies.
  • Supports dependable operation of power distribution and control equipment.
  • Manufactured by an established specialist in circuit protection technology.

Key Features

  • Mersen J300043 electrical protection product.
  • Designed for professional industrial electrical applications.
  • Manufacturer-specific identification supports accurate replacement selection.
  • Suitable for compatible power distribution and protection equipment.
  • Professional-grade construction for demanding electrical environments.
  • Suitable for panel-building, OEM and maintenance applications.
  • Intended for use with correctly matched electrical equipment.
  • Installation should be completed by qualified electrical personnel.

Dependable Support for Industrial Electrical Systems

Correctly selected circuit protection components help maintain the reliability and safety of industrial electrical equipment. They form part of a coordinated protection system intended to isolate electrical faults, protect connected components and reduce the risk of damage to machinery and power distribution infrastructure.

The Mersen J300043 should only be installed where its electrical characteristics, mechanical format and equipment compatibility match the original specification. Selection should be based on verified manufacturer data rather than appearance, product family or part-number similarity alone.

Typical Applications

  • Industrial electrical control panels.
  • Power distribution equipment.
  • Switchgear and circuit protection assemblies.
  • Machinery and automation systems.
  • OEM electrical equipment.
  • Maintenance, repair and replacement projects.

Technical Specifications

Item number J300043
Catalogue No PC31UD69V550EF
Description Square Body High-Speed Fuse Protistor® Size 31 aR 690VAC IEC 700VAC UL 550A With Striker Open Slot Blades
EAN/UPC Code 3605340322675
Rated voltage AC UL 700 V
Rated voltage AC IEC 690 V
Ampere Rating 550 A
RoHS Compliant Yes
AC or DC AC
Speed/Characteristic aR
Fuse Size 31
Mounting Bolted
Clearing I2t At Rated Voltage 310000 A²s
Melting I2t 52000 A²s
AC Max I.R./Breaking Capacity I1: 200 kA
Indication System Yes
Indication System Type Striker
Connection/Terminal Material Silver-Plated Copper
Connection/Terminal Type Open Slot Blades
Product Width 51 mm
Product Length 109.4 mm
Product Height 56.5 mm
Sell Pack Quantity 3 EA
Sell Pack Weight 1.2129 kg
Sell Pack Width 143 mm
Sell Pack Length 175 mm
Sell Pack Height 73 mm
Product group Semiconductor Protection Fuses
Body/Insulating Material Ceramic
Product Weight 0.4043 kg
Power Dissipation at Rated Current Value 75 W
HS Code 85361090
Country of Manufacture France
Fuse Type Semiconductor
Fuse Class aR
Voltage 690 V

Frequently Asked Questions

What is the Mersen J300043 used for?

The Mersen J300043 is an industrial electrical protection component intended for use in compatible power distribution, control or equipment protection systems.

Can the J300043 replace another component?

It should only replace a component with matching electrical ratings, operating characteristics, dimensions and terminal requirements. Compatibility must be verified before installation.

Which specifications should be checked before ordering?

Confirm the product function, current and voltage ratings, protection characteristics, physical dimensions, mounting arrangement and equipment compatibility.

Is the Mersen J300043 suitable for industrial equipment?

It is intended for professional electrical applications, provided its specifications and mechanical configuration match the requirements of the equipment.

Who should install the J300043?

Installation or replacement should be completed by a qualified electrical professional following the equipment manufacturer’s instructions and applicable electrical safety procedures.

Trusted Industrial Electrical Protection

Mersen electrical protection products are selected by engineers, panel builders and maintenance professionals to support safe and dependable operation across demanding industrial electrical applications.

● Service Agreements

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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.

 Priority sourcing and supply support

 Flexible payment terms for qualifying organisations

 Support for engineering, maintenance, and operations

500 +

Stock lines ready to ship

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Same day dispatches

3500 +

Customers supported

28 

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● frequently asked questions

Common questions about our products and support

 

At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.

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We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products. 

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