MERSEN FUSE 5 URD 33 TT F 2250 5URD33TTF2250

MERSEN FUSE 5 URD 33 TT F 2250 5URD33TTF2250

Protistor® high-speed fuse engineered for critical industrial protection with rapid response to overcurrent events in AC circuits up to 500VAC (IEC) and 550VAC (UL). Square body with flush striker ends and metric threads for secure installation.

SKU: K300757Alt SKU: PC33UD50V2250TFMPN: K300757
Price
List Price £454.58 ex VAT
Your Price (ex VAT)
£454.58
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.

SUBTOTAL (EX VAT) £454.58
Trade pricing is personalised to your account

Manufacturer Lead Time

Sold in packs of 3

£454.58

Why Choose the Mersen K300757 Industrial Fuse?

The Mersen K300757 is an industrial electrical protection component intended for use in compatible power distribution, machinery and automation systems. Manufactured by Mersen, a recognised specialist in electrical protection, this fuse is designed to support dependable circuit protection in professionally engineered installations.

Industrial fuses help protect cables, conductors, switching devices and valuable electrical equipment against potentially damaging overcurrent and short-circuit conditions. The robust construction associated with Mersen protection products makes them suitable for demanding applications involving control panels, production machinery and power conversion equipment.

The precise current rating, voltage rating, utilisation category, breaking capacity, terminal arrangement and dimensions of the K300757 should be verified from the product label or official Mersen technical documentation before purchase or installation. Correct fuse selection is essential for reliable protection, effective circuit coordination and safe equipment operation.

Key Advantages

  • Manufactured by Mersen, an established electrical protection specialist.
  • Designed to protect compatible circuits against excessive fault currents.
  • Suitable for industrial machinery and electrical distribution equipment.
  • Robust construction for demanding operating environments.
  • Helps reduce the risk of damage to valuable electrical components.
  • Suitable for OEM, maintenance and replacement requirements.

Key Features

  • Mersen industrial circuit protection product.
  • Manufacturer reference K300757.
  • Designed for overcurrent and short-circuit protection.
  • Industrial-grade construction.
  • Suitable for coordinated electrical protection systems.
  • Designed for installation in a compatible fuse holder or mounting assembly.
  • Suitable for machinery, automation and power distribution equipment.
  • Intended for professional electrical installation and maintenance.

Reliable Protection for Industrial Electrical Systems

Industrial fuses interrupt excessive current before it can cause serious thermal or mechanical damage to conductors, switching equipment and connected machinery. Correctly coordinated fuse protection can improve installation reliability, reduce equipment damage and minimise unplanned production downtime.

The Mersen K300757 should be selected according to the circuit voltage, normal operating current, prospective short-circuit current, connected equipment and applicable electrical regulations. Any replacement fuse must provide compatible electrical characteristics, terminal arrangements and physical dimensions.

Typical Applications

  • Industrial electrical control panels.
  • Power distribution and switching equipment.
  • Manufacturing and production machinery.
  • Motor control and automation systems.
  • Power conversion and industrial power supply equipment.
  • Electrical maintenance and replacement programmes.

Technical Specifications

Item number K300757
Catalogue No PC33UD50V2250TF
Description Square Body High-Speed Fuse Protistor® Size 33 aR 500VAC IEC 550VAC UL 2250A With Striker Flush ends metric threads
EAN/UPC Code 3605340333077
Rated voltage AC UL 550 V
Rated voltage AC IEC 500 V
Ampere Rating 2250 A
RoHS Compliant Yes
AC or DC AC
Speed/Characteristic aR
Fuse Size 33
Mounting Bolted
Clearing I2t At Rated Voltage 5160 kA²s
Melting I2t 1250 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 Brass
Connection/Terminal Type Flush ends
Product Width 73 mm
Product Length 50.6 mm
Product Height 78.5 mm
Sell Pack Quantity 3 EA
Sell Pack Weight 2.4168 kg
Sell Pack Width 85 mm
Sell Pack Length 245 mm
Sell Pack Height 95 mm
Product group Semiconductor Protection Fuses
Body/Insulating Material Ceramic
Product Weight 0.8056 kg
Power Dissipation at Rated Current Value 280 W
HS Code 85361090
Fuse Type Semiconductor
Fuse Class aR
Voltage 500 V

Frequently Asked Questions

What is the Mersen K300757 used for?

The Mersen K300757 is intended for use as an electrical protection component in compatible industrial circuits, machinery and power distribution equipment.

How can I confirm the electrical rating of the K300757?

The rated current, voltage, utilisation category and breaking capacity should be confirmed from the fuse label or official Mersen technical documentation before installation.

Can the K300757 replace another fuse model?

It should only replace another fuse when the electrical ratings, operating characteristics, terminal arrangement and physical dimensions are fully compatible.

Who should install the Mersen K300757?

The fuse should be selected and installed by a suitably qualified electrical professional in accordance with the equipment instructions and applicable electrical regulations.

Where is the Mersen K300757 typically installed?

It may be installed in compatible industrial control panels, machinery, power distribution systems and electrical protection assemblies.

Trusted Industrial Electrical Protection

Mersen circuit protection products are used by engineers, panel builders, equipment manufacturers and maintenance professionals to protect critical electrical systems against damaging fault conditions.

● 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…

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

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

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...