Call Us Today
01706 242050
Trade Portal
MERSEN FUSE A 070 URD 31 LI 0250 A070URD31LI0250

MERSEN FUSE A 070 URD 31 LI 0250 A070URD31LI0250

High-speed aR characteristic fuse rated at 690VAC IEC and 700VAC UL with 250A rating, featuring striker indication and slotted blade terminals for reliable semiconductor protection.

SKU: W300698Alt SKU: A070UD31LI250MPN: W300698
Price
List Price £128.22 ex VAT
Your Price (ex VAT)
£128.22
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) £128.22
Trade pricing is personalised to your account

Manufacturer Lead Time

Sold in packs of 3

£128.22

Why Choose the Mersen W300698 Protistor® High-Speed Fuse?

The Mersen W300698 (A070UD31LI250) is a Protistor® Size 31 high-speed square body semiconductor fuse designed to provide reliable protection for modern power electronic equipment against damaging short-circuit currents. Engineered for demanding industrial applications, it delivers ultra-fast fault interruption and excellent current limitation to help protect valuable semiconductor devices.

Manufactured with precision die-cut fuse elements embedded in solidified sand, the W300698 offers low let-through energy (I²t), high interrupting capacity and dependable operation. Silver-plated contact surfaces and non-magnetic hardware provide excellent electrical performance and long service life in harsh industrial environments.

The W300698 is designed specifically for protecting IGBTs, thyristors, diodes and other semiconductor devices used within industrial drives, converters, UPS systems and power conversion equipment where rapid fault clearance is essential.

Key Advantages

  • Ultra-fast aR semiconductor protection.
  • Protects IGBTs, thyristors and power semiconductor modules.
  • Low I²t design minimises damaging fault energy.
  • High breaking capacity for demanding industrial applications.
  • Integrated striker indicator for fuse monitoring.
  • Manufactured by Mersen for critical power electronic systems.

Key Features

  • Mersen Protistor® Size 31 square body fuse.
  • Manufacturer reference W300698.
  • Catalogue number A070UD31LI250.
  • aR ultra-fast semiconductor protection.
  • Long slotted blade (LI) terminals.
  • Integrated striker indicator.
  • Silver-plated contact surfaces.
  • Low let-through energy for semiconductor protection.

Designed for Modern Power Electronics

The W300698 has been engineered to provide maximum flexibility in equipment design while delivering reliable protection for today's power conversion equipment. Its ultra-fast operating characteristic limits thermal and electrical stress before semiconductor devices can be damaged, helping maximise equipment uptime and reduce maintenance costs.

Its compact ceramic square body, silver-plated terminals and integrated striker indicator make it suitable for both OEM installations and replacement applications where dependable semiconductor protection is essential.

Typical Applications

  • Variable frequency drives (VFDs).
  • Industrial motor drives.
  • Power converters.
  • Rectifier systems.
  • UPS equipment.
  • Renewable energy converters.
  • Industrial inverters.
  • Power semiconductor protection.

Technical Specifications

Item number W300698
Catalogue No A070UD31LI250
Description Square Body High-Speed Fuse Protistor® Size 31 aR 690VAC IEC 700VAC UL 250A With Striker Slotted Blades long
EAN/UPC Code 3605340332407
Rated voltage AC UL 700 V
Rated voltage AC IEC 690 V
Ampere Rating 250 A
RoHS Compliant Yes
AC or DC AC
Speed/Characteristic aR
Fuse Size 31
Mounting Bolted
Clearing I2t At Rated Voltage 28000 A²s
Melting I2t 4700 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 Slotted Blades
Product Width 51 mm
Product Length 148.6 mm
Product Height 56.5 mm
Sell Pack Quantity 3 EA
Sell Pack Weight 1.2519 kg
Sell Pack Width 155 mm
Sell Pack Length 165 mm
Sell Pack Height 60 mm
Product group Semiconductor Protection Fuses
Body/Insulating Material Ceramic
Product Weight 0.4173 kg
Power Dissipation at Rated Current Value 52 W
HS Code 85361090
Country of Manufacture France
Fuse Type Semiconductor
Fuse Class aR
Voltage 690 V

Frequently Asked Questions

What is the Mersen W300698 used for?

The W300698 is a Protistor® high-speed semiconductor fuse designed to protect IGBTs, thyristors, diodes and other semiconductor devices from damaging short-circuit faults.

What are the electrical ratings of the W300698?

The fuse is rated at 250 A with a rated voltage of 690 VAC (IEC) and 700 VAC (UL), featuring an ultra-fast aR characteristic and a 200 kA AC breaking capacity.

What mounting style does the W300698 use?

The fuse is supplied with long slotted blade (LI) terminals and an integrated striker indicator for fuse status monitoring.

Which applications commonly use the W300698?

Typical applications include industrial drives, power converters, UPS systems, rectifiers, inverters and other semiconductor-based power conversion equipment.

Can the W300698 replace another fuse?

Replacement should only be carried out with a fuse having identical electrical ratings, body size, mounting style and semiconductor protection characteristics.

Trusted Semiconductor Protection

Mersen Protistor® high-speed semiconductor fuses are trusted worldwide for protecting critical power electronic equipment through rapid fault interruption, low let-through energy and outstanding reliability.

● 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...