Call Us Today
01706 242050
Trade Portal
MERSEN FUSE 6,9 URD 33 D08 A 1400 6,9URD33D08A1400

MERSEN FUSE 6,9 URD 33 D08 A 1400 6,9URD33D08A1400

High-speed Protistor® fuse with striker indication, designed for semiconductor protection up to 1400A, rated 690VAC IEC and 700VAC UL, with DIN 80 blade terminals.

SKU: R300257Alt SKU: PC33UD69V1400AMPN: R300257
Price
List Price £312.45 ex VAT
Your Price (ex VAT)
£312.45
Manufacturer Lead Time Please contact us for a delivery time before you order
Get the best trade prices Trade exclusive

Create a trade account to unlock exclusive pricing, special offers and more.

Sign up for a trade account Quick & easy setup
SUBTOTAL (EX VAT) £312.45
Trade pricing is personalised to your account

Manufacturer Lead Time

Sold in packs of 3

£312.45

Why Choose the Mersen R300257 Industrial Electrical Component?

The Mersen R300257 is a genuine Mersen industrial electrical component identified by its precise manufacturer reference. It is intended for professional maintenance, repair and replacement requirements where the original equipment documentation or installed component specifies part number R300257.

Mersen is an established manufacturer of electrical protection, power management and industrial safety products. Selecting a component with the correct manufacturer reference helps engineers, panel builders and maintenance teams reduce compatibility risks while supporting dependable equipment operation.

The exact electrical ratings, dimensions, connection arrangement and mounting requirements of the R300257 should be verified against current Mersen technical documentation before purchase or installation. The complete markings on the existing component should also be checked to confirm that the replacement matches the required application.

Key Advantages

  • Genuine Mersen industrial electrical component.
  • Clearly identified by manufacturer reference R300257.
  • Suitable for professional maintenance, repair and replacement work.
  • Supports accurate component identification and procurement.
  • Manufactured by an established electrical protection specialist.
  • Suitable for engineers, OEMs, panel builders and maintenance teams.

Key Features

  • Mersen branded industrial component.
  • Manufacturer part number R300257.
  • Intended for professional industrial electrical applications.
  • Suitable for replacing a component carrying the same reference.
  • Supports planned maintenance and equipment refurbishment.
  • Manufacturer-specific identification simplifies spare-parts management.
  • Compatibility should be confirmed before ordering.
  • Installation should be completed by suitably qualified personnel.

Reliable Component Selection for Industrial Systems

Industrial electrical equipment often requires replacement components to match an exact manufacturer reference. Correct part-number matching helps ensure that the selected product has the appropriate electrical characteristics, physical dimensions, terminal arrangement and mounting configuration for the intended equipment.

Before installing the Mersen R300257, engineers should compare the complete markings on the original component with the equipment manual, electrical schematics and current manufacturer information. Voltage, current, connection method, mounting arrangement and system compatibility must all be verified before commissioning.

Typical Applications

  • Industrial electrical maintenance.
  • Machinery servicing and repair.
  • Electrical control panel refurbishment.
  • Power distribution equipment maintenance.
  • OEM equipment replacement projects.
  • Industrial spare-parts inventories.

Technical Specifications

Item number R300257
Catalogue No PC33UD69V1400A
Description Square Body High-Speed Fuse Protistor® Size 33 aR 690VAC IEC 700VAC UL 1400A With Striker DIN 80 Blades
EAN/UPC Code 3605340325874
Rated voltage AC UL 700 V
Rated voltage AC IEC 690 V
Ampere Rating 1400 A
RoHS Compliant Yes
AC or DC AC
Speed/Characteristic aR
Fuse Size 33
Mounting Bolted
Clearing I2t At Rated Voltage 2700 kA²s
Melting I2t 465 kA²s
AC Max I.R./Breaking Capacity I1: 200 kA
Design Details Reinforced Terminal
Indication System Yes
Indication System Type Striker
Connection/Terminal Material Silver-Plated Copper
Connection/Terminal Type DIN 80 Blades
Product Width 73 mm
Product Length 110 mm
Product Height 78.5 mm
Sell Pack Quantity 3 EA
Sell Pack Weight 2.4369 kg
Sell Pack Width 145 mm
Sell Pack Length 250 mm
Sell Pack Height 90 mm
Product group Semiconductor Protection Fuses
Body/Insulating Material Ceramic
Product Weight 0.8123 kg
Power Dissipation at Rated Current Value 200 W
HS Code 85361090
Fuse Type D / D0 (Neozed/Diazed), Semiconductor
Fuse Class aR
Voltage 690 V

Frequently Asked Questions

What is the Mersen R300257?

The R300257 is a Mersen industrial electrical component identified by its manufacturer-specific reference. Its exact product type and technical ratings should be confirmed using current Mersen documentation.

How can I confirm that the R300257 is compatible with my equipment?

Compare the complete part number and product markings with the installed component, equipment manual, electrical drawings and current Mersen technical information.

Can the R300257 replace a component with a different part number?

A component with a different reference should only be used when its electrical ratings, physical dimensions, terminals and manufacturer-approved compatibility have been fully verified.

Who should install the Mersen R300257?

Installation should be completed by a suitably qualified electrical engineer or technician following the applicable isolation, inspection and electrical safety procedures.

Where is this component typically used?

The R300257 may be used in industrial machinery, electrical panels, power equipment and maintenance applications where this exact Mersen reference is specified.

Trusted Industrial Electrical Solutions

Mersen products are used by engineers, equipment manufacturers, panel builders and maintenance professionals to support dependable electrical protection, power management and industrial system operation.

● Service Agreements

Credit Accounts

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

1,000 +

Same day dispatches

3500 +

Customers supported

28 

Trusted Manfacturers

● 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.

What product ranges do you supply

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

Can you help specify the correct part?

Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.

Do you have stock for urgent orders?

Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.

What are your delivery times and costs?

Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.

What about warranties, returns and faulty items?

Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.

● latest blog

Discover  our latest insights and
expert advice

From a Simple Idea to Small Business of the Year: The LED Controls Story So Far…

From a Simple Idea to Small Business of the Year: The LED Controls Story So Far…

by | Aug 11, 2026 |

LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.

LED Controls: Danfoss Drives Authorised Partner

LED Controls: Danfoss Drives Authorised Partner

by | Jan 17, 2026 |

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...

LED Controls: Your Complete Control Panel Solution

LED Controls: Your Complete Control Panel Solution

by | Jan 17, 2026 |

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...